# Physics 202 Spring 2010 Practice Questions for Chapters 21-24

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 Note: Answer key is at end. Physics 202 Spring 2010 Practice Questions for Chapters A uniformly positively charged spherical conductor is placed midway between two identical uncharged conducting spheres. How would the charges in the middle sphere be distributed? A) The positive charges stay uniformly distributed on the surface of the middle sphere. B) There are more positive charges near the top and bottom of the sphere compared to the sides next to the two other spheres. C) There are more positive charges near the sides of the spheres that are next to the other two spheres compared to the other regions of the sphere. D) There are more positive charges near the front and back of the sphere compared to the sides next to the two other spheres. E) None of these is correct. 2. Two small spheres, each with mass m = 5.0 g and charge q, are suspended from a point by threads of length L = 0.30 m. What is the charge on each sphere if the threads make an angle θ = 20 with the vertical? A) C B) C C) C D) C E) C Page 1 of 40

2 3. Charges q 1 and q 2 exert repulsive forces of 10 N on each other. What is the repulsive force when their separation is decreased so that their final separation is 80% of their initial separation? A) 16 N B) 12 N C) 10 N D) 8.0 N E) 6.4 N 4. Two positive charges (+8.0 mc and +2.0 mc) are separated by 300 m. A third charge is placed at distance r from the +8.0 mc charge in such a way that the resultant electric force on the third charge due to the other two charges is zero. The distance r is A) 0.25 km B) 0.20 km C) 0.15 km D) 0.13 km E) 0.10 km 5. Point charges of C and C are placed 12 cm apart. A third point charge of C halfway between the first two point charges experiences a force of magnitude A) N B) N C) N D) zero E) N 6. A charge 2Q is located at the origin while a second charge Q is located at x = a. Where should a third charge be placed so that the net force on the charge is zero? A) x < 0 B) 0 < x < a C) x > a D) x < 0 or 0 < x < a E) 0 < x < a or x > a Page 2 of 40

3 7. If all the charges are 15 cm from the origin (the crossing point of the vertical and horizontal lines) in the above figure and Q = +3.0 µc, then calculate the magnitude of the net force on a charge of +Q placed at the origin. A) 22.8 N B) 10.2 N C) 26.0 N D) 187 N E) none of the above 8. Three charges are located at 100-m intervals along a horizontal line: a charge of 3.0 C on the left, 2.0 C in the middle, and 1.0 C on the right. What is the electric field on the horizontal line halfway between the 3.0 C and 2.0 C charges? A) N/C to the left B) N/C to the right C) N/C to the left D) N/C to the right E) N/C to the left Page 3 of 40

4 9. Three charges Q 1, Q 2, and Q 3, each equal to C, are in a straight line. The distance between neighboring charges is 60 nm. The magnitude of the electric field at P, which is 80 nm from Q 2 on a line at right angles to the line between Q 1 and Q 3, is A) N/C B) 16 N/C C) 2.0 N/C D) N/C E) N/C 10. Three charges, each of Q = C, are arranged at three of the corners of a 20-nm square as shown. The magnitude of the electric field at D, the fourth corner of the square, is approximately A) N/C B) N/C C) N/C D) 30 N/C E) N/C Page 4 of 40

5 11. The electric field at point A is zero. What is charge Q 1? A) +32 µc B) 32 µc C) The field cannot be zero at A for any value of Q 1. D) +16 µc E) 16 µc 12. Charges Q 1 = q and Q 2 = +4q are placed as shown. Of the five positions indicated by the numbered dots, the one at which the electric field is zero is A) 1 B) 2 C) 3 D) 4 E) Two charges Q 1 and Q 2 are a distance d apart. If the electric field is zero at a distance of 3d/4 from Q 1 (towards Q 2 ), then what is the relation between Q 1 and Q 2? A) Q 1 = Q 2 /9 B) Q 1 = 9Q 2 C) Q 1 = Q 2 /3 D) Q 1 = 3Q 2 E) Q 1 = 4Q 2 /3 Page 5 of 40

6 14. A bob of mass m (m = g), and charge magnitude Q (Q = 50.0 µc) is held by a massless string in a uniform electric field E. If the bob makes an angle of 10.0 degrees with the vertical, then calculate the magnitude of the electric field E and the sign of the bob charge Q. A) N/C and Q is positive. B) N/C and Q is negative. C) N/C and Q is positive. D) N/C and Q is negative. E) N/C and Q is positive. 15. The point P is on the axis of a ring of charge, and all vectors shown lie in the yz plane. The negatively charged ring lies in the xz plane. The vector that correctly represents the direction of the electric field at this point is A) B) C) D) E) Page 6 of 40

7 16. In the diagram, Q 1 = 9.0 µc and Q 2 = 9.0 µc. If Q 2 has a mass of 3.0 g, a uniform electric field of 1.8 kn/c imposed in the positive y direction would give this particle an acceleration in the y direction of approximately A) zero B) 5.4 m/s 2 C) 6.8 cm/s 2 D) 4.5 m/s 2 E) 7.5 cm/s An electron is released from rest in a uniform electric field. If the electric field is 3.65 kn/c, at the end of 15 ns the electron's velocity will be approximately A) m/s B) m/s C) m/s D) m/s E) m/s 18. An electric dipole consists of a positive charge separated from a negative charge of the same magnitude by a small distance. Which, if any, of the diagrams best represents the electric field lines around an electric dipole? A) 1 B) 2 C) 3 D) 4 E) None of these is correct. Page 7 of 40

8 19. Two electric dipoles, p 1 and p 2, are arranged as shown. The first dipole is not free to rotate but the second dipole can rotate in any direction. Which way will p 2 rotate? The directions represent the following: 1 clockwise, 2 counter-clockwise, 3 rotate about axis of the dipole rolling up, and 4 rotate about axis of the dipole rolling down. A) 1 B) 2 C) 3 D) 4 E) None of these is correct. 20. An electric dipole of magnitude 25 p C m makes an angle of 65 with a uniform electric field of magnitude N/C. What is the magnitude of the torque on the dipole? A) N m B) N m C) N m D) N m E) N m Page 8 of 40

9 21. An electric dipole of moment is placed in a uniform external electric field as shown in the diagram. The dipole moment vector is in the positive y direction. The external electric field vector is in the positive x direction. If the dipole is to have minimum potential energy, should be in the A) positive x direction. B) negative x direction. C) positive y direction. D) negative y direction. E) positive z direction. 22. An infinite line charge of linear density λ = 0.30 µc/m lies along the z axis and a point charge q = 6.0 µc lies on the y axis at y = 2.0 m. The x component of the electric field at the point P on the x axis at x = 3.0 m is approximately A) 1.8 kn/c B) 4.2 kn/c C) 0.96 kn/c D) 5.2 kn/c E) 0.64 mn/c 23. A disk of radius 10 cm carries a uniform surface charge density of 6.0 µc/m 2. The electric field on the axis of the disk at a distance of 0.10 cm is approximately A) 0.34 MN/C B) 68 kn/c C) 99 kn/c D) 0.54 MN/C E) 18 kn/c Page 9 of 40

10 24. A conducting circular disk has a uniform positive surface charge density. Which of the following diagrams best represents the electric field lines from the disk? (The disk is drawn as a cross section.) A) 1 B) 2 C) 3 D) 4 E) none of the diagrams 25. An infinite plane lies in the yz plane and it has a uniform surface charge density. The electric field at a distance x from the plane A) decreases linearly with x. B) decreases as 1/x 2. C) is constant and does not depend on x. D) increases linearly with x. E) is undetermined. 26. A uniform line charge of linear charge density λ = 5.00 nc/m extends from x = 0 to x = 10 m. The magnitude of the electric field at the point y = 12 m on the perpendicular bisector of the finite line of charge is A) 18.8 N/C B) 15.3 N/C C) 9.65 N/C D) 4.27 N/C E) 2.88 N/C 27. A uniform circular ring has charge Q and radius r. A uniformly charged disk also has charge Q and radius r. Calculate the ratio of the electric field at a distance of r along the axis of the ring to the electric field at a distance of r along the axis of the disk. A) 1.0 B) 0.60 C) 1.7 D) 0.50 E) 0.85 Page 10 of 40

11 28. Consider a uniform electric field = (5.0 kn/c). What is the flux of this field through a square of side 20 cm in a plane parallel to the yz plane? A) 0.10 kn m 2 /C B) 0.20 kn m 2 /C C) 0.40 kn m 2 /C D) 0.50 kn m 2 /C E) 0.13 kn m 2 /C 29. An electric field is = (400 N/C) for x > 0 and = ( 400 N/C) for x < 0. A cylinder of length 30 cm and radius 10 cm has its center at the origin and its axis along the x axis such that one end is at x = +15 cm and the other is at x = 15 cm. What is the flux through the curved surface of the cylinder? A) zero B) 1.3 kn m 2 /C C) 0.25 kn m 2 /C D) 1.3 N m 2 /C E) 0.13 MN m 2 /C 30. An electric field is = (400 N/C) for x > 0 and = ( 400 N/C) for x < 0. A cylinder of length 30 cm and radius 10 cm has its center at the origin and its axis along the x axis such that one end is at x = +15 cm and the other is at x = 15 cm. What is the net charge inside the cylinder? A) zero B) 22 nc C) 0.22 nc D) 4.5 nc E) 2.2 µc 31. A cube of side 3.56 cm has a charge of 9.11 µc placed at its center. Calculate the electric flux through one side of the cube. A) N. m 2 /C B) N. m 2 /C C) N. m 2 /C D) N. m 2 /C E) N. m 2 /C Page 11 of 40

12 32. A horizontal surface of area m 2 has an electric flux of 123 N. m 2 /C passing through it at an angle of 25 to the horizontal. If the flux is due to a uniform electric field, calculate the magnitude of the latter. A) 907 N. m 2 /C B) 423 N. m 2 /C C) N. m 2 /C D) N. m 2 /C E) 383 N. m 2 /C 33. A rod of infinite length has a charge per unit length of λ (= q/l). Gauss's law makes it easy to determine that the electric field strength at a perpendicular distance r from the rod is, in terms of k = (4πε 0 ) 1, A) kλ/r 2 B) kλ/r C) 4πkλ/r D) 2kλ/r E) zero 34. A hollow metal sphere has a total charge of 100 µc. If the radius of the sphere is 50 cm, the electric field intensity at a distance of 3.0 m from the surface of the sphere is approximately A) N/C B) N/C C) N/C D) N/C E) N/C Page 12 of 40

13 35. A sphere of radius 8.0 cm carries a uniform volume charge density ρ = 500 nc/m 3. What is the electric field at r = 8.1 cm? A) 0.12 kn/c B) 1.5 kn/c C) 0.74 kn/c D) 2.3 kn/c E) 12 kn/c 36. An infinitely long cylinder of radius 4.0 cm carries a uniform volume charge density ρ = 200 nc/m 3. What is the electric field at r = 3.9 cm? A) zero B) 0.44 kn/c C) 57 N/C D) 0.11 kn/c E) 0.23 kn/c 37. An infinitely long cylinder of radius 4.0 cm carries a uniform volume charge density ρ = 200 nc/m 3. What is the electric field at r = 4.1 cm? A) zero B) 0.11 kn/c C) 57 N/C D) 0.44 kn/c E) 0.23 kn/c Page 13 of 40

14 38. An infinitely long cylindrical shell of radius 6.0 cm carries a uniform surface charge density σ = 12 nc/m 2. The electric field at r = 6.1 cm is approximately A) 0.81 kn/c B) zero C) 1.3 kn/c D) 12 kn/c E) 0.56 kn/c 39. A spherical shell of radius 9.0 cm carries a uniform surface charge density σ = 9.0 nc/m 2. The electric field at r = 4.0 cm is approximately A) 0.13 kn/c B) 1.0 kn/c C) 0.32 kn/c D) 0.75 kn/c E) zero 40. A spherical shell of radius 9.0 cm carries a uniform surface charge density σ = 9.0 nc/m 2. The electric field at r = 16 cm is approximately A) 0.32 kn/c B) 1.0 kn/c C) zero D) 0.13 kn/c E) 0.53 kn/c Page 14 of 40

15 Use the following to answer questions An infinite slab of thickness 2d lies in the xz plane. The slab has a uniform volume charge density ρ. 41. The electric at y = b where 0 < b < d is A) 4πkρb B) 2πkρb C) 4πkρ/b D) 2πkρ/b E) 4πkρ/b Which diagram best represents the electric field along the y axis? A) 1 B) 2 C) 3 D) 4 E) none of the diagrams Page 15 of 40

16 43. A non-conducting pipe has a uniform charge density of 50 C/m 3. The inner radius of the pipe is 25 cm, while the outer radius is 35 cm. Calculate the magnitude of the electric field at r = 30 cm. A) N/C B) N/C C) N/C D) N/C E) N/C 44. The electric field for an infinite plane of charge is discontinuous by the amount at a point where there is a surface charge density σ. A) ε 0 /σ B) σ/ε 0 C) ε 0 /σ 2 D) ε 0 2 /σ 2 E) σ 2 /ε The voltage between the cathode and the screen of a television set is 22 kv. If we assume a speed of zero for an electron as it leaves the cathode, what is its speed just before it hits the screen? A) m/s B) m/s C) m/s D) m/s E) m/s 46. The electric field in a region is given by where the units are in V/m. What is the potential from the origin to (x, y) = (2, 0) m? A) 8 V B) 8 V C) 16/3 V D) 24/3 V E) 11 V Page 16 of 40

17 47. A lithium nucleus with a charge of 3( ) C and a mass of 7( ) kg, and an alpha particle with a charge of 2( ) C and a mass of 4( ) kg, are at rest. They could be accelerated to the same kinetic energy by A) accelerating them through the same electrical potential difference. B) accelerating the alpha particle through V volts and the lithium nucleus through 2V/3 volts. C) accelerating the alpha particle through V volts and the lithium nucleus through 7V/4 volts. D) accelerating the alpha particle through V volts and the lithium nucleus through 7V/6 volts. E) none of these procedures 48. A charge of 2.0 mc is located in a uniform electric field of intensity N/C. How much work is required to move this charge 20 cm along a path making an angle of 60 with the electric field? A) 0.14 J B) 0.34 J C) 80 mj D) 14 J E) 8.0 J 49. Two parallel horizontal plates are spaced 0.40 cm apart in air. You introduce an oil droplet of mass kg between the plates. If the droplet carries two electronic charges and if there were no air buoyancy, you could hold the droplet motionless between the plates if you kept the potential difference between them at A) 60 V B) 12 V C) 3.0 V D) 0.12 kv E) 6.0 V Page 17 of 40

18 50. Two parallel metal plates 0.35 cm apart have a potential difference between them of 175 V. The electric force on a positive charge of C at a point midway between the plates is approximately A) N B) N C) N D) N E) N 51. A uniform electric field exists between two parallel plates separated by 1.2 cm. The intensity of the field is 23 kn/c. What is the potential difference between the plates? A) 7.5 MV B) 3.0 MV C) 15 kv D) 0.30 kv E) None of these is correct. Page 18 of 40

19 Use the following to answer questions Two equal positive charges are placed x m apart. The equipotential lines are at 100 V intervals. 52. The potential for line c is A) 100 V B) +100 V C) 200 V D) +200 V E) zero 53. The work required to move a third charge, q = e, from the +100 V line to b is A) 100 ev B) +100 ev C) 200 ev D) +200 ev E) zero 54. The potential a distance R from a unit positive point charge is found to be V. If the distance between the charge and the point at which the potential is measured is tripled and is now 3V, the potential becomes A) V/3 B) 3V C) V/9 D) 9V E) 1/V 2 Page 19 of 40

20 55. Two charges Q 1 and Q 2 are at rest a distance of 66 cm apart. How much work must be done to slowly move the charges to a separation of 33 cm? (Q 1 = C and Q 2 = C) A) J B) J C) J D) J E) J 56. The figure depicts a uniform electric field. The direction in which there is no change in the electric potential is A) 1 B) 2 C) 3 D) 4 E) 5 Page 20 of 40

21 57. The figure depicts a uniform electric field. The direction in which the increase in the electric potential is a maximum is A) 1 B) 2 C) 3 D) 4 E) The electric potential in a region of space is given by V(x) = 50 V + (15 V/m) x. The electric field in this region is A) 50 V B) (15 V/m)x C) (50 V/m + 15 V/m) D) (15 V/m) E) (15 V/m) 59. The electric potential in a region of space is given by V(x, y, z) = (10 V/m) x + (20 V/m) y + (30 V/m) z The x-component of the electric field in this region is A) (10 V/m) B) (10 V/m) C) (20 V/m) D) (20 V/m) E) (30 V/m) Page 21 of 40

22 60. If the potential V of an array of charges versus the distance from the charges is as shown in graph 1, which graph shows the electric field E as a function of distance r? A) 2 B) 3 C) 4 D) 5 E) The electric potential is known to be a function of x only; i.e., v = V(x). The electric field at a position x 1 is given by A) V(x 1 ) B) C) D) E) 62. The graph that best represents the electric potential of a uniformly charged spherical shell as a function of the distance from the center of the shell is A) 1 B) 2 C) 3 D) 4 E) 5 Page 22 of 40

23 Use the following to answer question A ring of radius 5 cm is the yz plane with its center at the origin. The ring carries a uniform charge of 10 nc. A small particle of mass m = 10 mg and charge q 0 = 5 nc is placed at x = 12 cm and released. The speed of the particle when it is a great distance from the ring is A) 1.36 cm/s B) 1.94 cm/s C) 2.63 cm/s D) 3.43 cm/s E) None of these is correct. 64. The graph that represents the electric potential near an infinite plane of charge is A) 1 B) 2 C) 3 D) 4 E) 5 Page 23 of 40

24 65. A copper ring lies in the yz plane, as shown. The magnet's long axis lies along the x axis. Induced current flows through the ring, as indicated in the figure. The magnet A) must be moving away from the ring. B) must be moving toward the ring. C) must be moving either away from or toward the ring. D) is not necessarily moving. E) must remain stationary to keep the current flowing 66. If you were to double the amplitude and halve the frequency of a harmonic (sinusoidal) wave on a string while keeping the wave speed constant, the rate at which energy is delivered by the wave would A) double. B) quadruple. C) be reduced to 50% of its previous value. D) be reduced to 25% of its previous value. E) be unchanged. 67. A charge of 100 nc resides on the surface of a spherical shell of radius 20 cm. The electric potential at a distance of 50 cm from the center of the spherical shell is A) 18 V B) 180 V C) 1800 V D) 18,000 V E) None of these is correct. 68. The potential of a spherical shell carrying 6.0 µc of charge is 540 kv. What is the radius of the shell? A) m B) m C) m D) m E) none of the above Page 24 of 40

25 69. A conducting sphere of radius r 1 = 10 cm and charge q 1 = 2 µc is placed far apart from a second conducting sphere of radius r 2 = 30 cm and charge q 2 = 3 µc. The two spheres are then connected by a thin conducting wire. What is the potential on the surface of the first sphere after the two spheres are connected by the wire? Use the reference V = 0 for r at infinity. A) V B) V C) V D) V E) none of the above 70. The figure shows portions of four equipotential surfaces whose potentials are related as follows: V 1 > V 2 > V 3 > V 4. The lines represent four paths (A A', B B', C C', D D') along which equal test charges are moved. The work involved can be said to be A) the greatest for path A A'. B) the greatest for path B B'. C) the greatest for path C C'. D) the greatest for path D D'. E) the same for all paths. Page 25 of 40

26 71. Two charged metal spheres are connected by a wire. Sphere A is larger than sphere B, as shown. The magnitude of the electric potential of sphere A A) is greater than that at the surface of sphere B. B) is less than that at the surface of sphere B. C) is the same as that at the surface of sphere B. D) could be greater than or less than that at the surface of sphere B, depending on the radii of the spheres. E) could be greater than or less than that at the surface of sphere B, depending on the charges on the spheres. 72. The potential on the surface of a solid conducting sphere of radius r = 20 cm is 100 V. The potential at r = 10 cm is A) 100 V B) 50 V C) 25 V D) zero E) cannot be determined 73. A solid spherical conductor of radius 15 cm has a charge Q = 6.5 nc on it. A second, initially uncharged, spherical conductor of radius 10 cm is moved toward the first until they touch and is then moved far away from it. How much charge is there on the second sphere after the two spheres have been separated? A) 2.6 nc B) 2.2 nc C) 3.2 nc D) 3.9 nc E) 4.3 nc Page 26 of 40

27 74. A solid conducting sphere of radius r a is placed concentrically inside a conducting spherical shell of inner radius r b1 and outer radius r b2. The inner sphere carries a charge Q while the outer sphere does not carry any net charge. The potential for r b1 < r < r b2 is A) B) C) D) E) zero 75. A metal ball of charge +Q is lowered into an insulated, uncharged metal shell and allowed to rest on the bottom of the shell. When the charges reach equilibrium, A) the outside of the shell has a charge of Q and the ball has a charge of +Q. B) the outside of the shell has a charge of +Q and the ball has a charge of +Q. C) the outside of the shell has a charge of zero and the ball has a charge of +Q. D) the outside of the shell has a charge of +Q and the ball has zero charge. E) the ouside of the shell has a charge of +Q and the ball has a charge of Q. 76. Dielectric breakdown occurs in the air at an electric field strength of E max = V/m. If the maximum charge that can be placed on a spherical conductor is C before breakdown, calculate the diameter of the sphere. A) 6.0 m B) 4.9 m C) 1.2 m D) 2.5 m E) 3.0 m Page 27 of 40

28 77. A positive point charge of 10 4 C is located 3 m from another positive point charge of 10 5 C. Their mutual electric potential energy is A) 3 J B) 2 J C) 1 J D) zero E) 1 J 78. Three charges are brought from infinity and placed at the corner of an equilateral triangle. Which of the following statements is true? A) The work required to assemble the charges is always positive. B) The electrostatic potential energy of the system is always positive. C) The electrostatic potential energy does not depend on the order the charges are placed at the corners. D) The work required to assemble the charges depends on which charge is placed at which corner. E) The electrostatic potential energy depends on which charge is placed at which corner. 79. Calculate the change in electrostatic potential energy of a charge, Q = 1 µc, when it is moved from a distance x = 4 m to 2 m from an infinite plane of uniform surface charge density σ = 10 µc/m 2. A) 1.13 J B) J C) 1.69 J D) 2.82 J E) zero 80. A capacitor of capacitance C holds a charge Q when the potential difference across the plates is V. If the charge Q on the plates is doubled to 2Q, A) the capacitance becomes (1/2)V. B) the capacitance becomes 2C. C) the potential changes to (1/2)V. D) the potential changes to 2V. E) the potential does not change. Page 28 of 40

29 81. If a capacitor of capacitance 2.0 µf is given a charge of 1.0 mc, the potential difference across the capacitor is A) 0.50 kv B) 2.0 V C) 2.0 µv D) 0.50 V E) None of these is correct. 82. If the area of the plates of a parallel-plate capacitor is doubled, the capacitance is A) not changed. B) doubled. C) halved. D) increased by a factor of 4. E) decreased by a factor of 1/ You want to store excess electrons on the negative plate of a capacitor at 9.0 V. How large a capacitance must you use? A) µf B) 0.18 µf C) 0.18 nf D) 14 pf E) 5.6 pf 84. A coaxial cable consists of a wire of radius 0.30 mm and an outer conducting shell of radius 1.0 mm. Its capacitance per unit length is approximately A) 17 nf/m B) 0.11 nf/m C) 92 pf/m D) 23 pf/m E) 46 pf/m 85. You make a homemade capacitor out of two flat circular metal plates, each of radius 5 cm, and hold them a distance of 1 cm apart. You then connect each plate to the terminals of a 6-V battery. What would be the capacitance of your capacitor? A) F B) F C) F D) F E) F Page 29 of 40

30 86. A capacitor is constructed by placing a conducting sphere of radius a concentrically inside a thin conducting spherical shell of radius b. Derive an expression for the capacitance of such a capacitor. A) B) C) D) E) It is not possible to construct such a capacitor. 87. Which of the following statements is false? A) In the process of charging a capacitor, an electric field is produced between its plates. B) The work required to charge a capacitor can be thought of as the work required to create the electric field between its plates. C) The energy density in the space between the plates of a capacitor is directly proportional to the first power of the electric field. D) The potential difference between the plates of a capacitor is directly proportional to the electric field. E) All of these are true. 88. If you increase the charge on a parallel-plate capacitor from 3 µc to 9 µc and increase the plate separation from 1 mm to 3 mm, the energy stored in the capacitor changes by a factor of A) 27 B) 9 C) 3 D) 8 E) 1/3 89. A 2.0-µF capacitor has a potential difference of 5000 V. The work done in charging it was A) 2.5 J B) 5.0 J C) 25 J D) 5.0 mj E) 0.50 kj Page 30 of 40

31 90. You attach a 30-pF capacitor across a 1.5-V battery. How much energy is stored in the capacitor? A) J B) J C) J D) J E) J 91. If the area of the plates of a parallel plate capacitor is halved and the separation between the plates tripled, while the charge on the capacitor remains constant, then by what factor does the energy stored in the capacitor change? A) increase by a factor of 2 B) decrease by a factor of 2/3 C) increase by a factor of 6 D) increase by a factor of 3/2 E) decrease by a factor of 1/6 92. A coaxial cable has the inner wire of radius a = 1 mm and the outside shield of radius b = 8 mm. The electric field strength between the wire and the shield is given by A) nj B) 6.69 µj C) 3.34 µj D) 14.5 µj E) zero. The electrostatic energy per meter of the cable is Page 31 of 40

32 Use the following to answer questions 93 and You connect three capacitors as shown in the diagram below. The effective capacitance of this combination when C 1 = 5.0 µf, C 2 = 4.0 µf, and C 3 = 3.0 µf is approximately A) 0.44 µf B) 2.3 µf C) 3.5 µf D) 5.2 µf E) 12 µf 94. You connect three capacitors as shown in the diagram. C 1 = 5.0 µf, C 2 = 4.0 µf, and C 3 = 3.0 µf. If you apply 12 V between points A and B, the energy stored in C 3 will be approximately A) 0.16 mj B) 41 µj C) 0.12 mj D) 0.41 mj E) 16 mf 95. The voltage across each capacitor in a set of capacitors in parallel is A) directly proportional to its capacitance. B) inversely proportional to its capacitance. C) independent of its capacitance. D) the same. E) None of these is correct. Page 32 of 40

33 96. You connect two capacitors C 1 = 15 pf and C 2 = 30 pf in series across a 1.5-V battery. The potential difference across capacitor C 1 is approximately A) 0.50 V B) 1.0 V C) 1.5 V D) 0.33 V E) 0.67 V 97. If C 1 < C 2 < C 3 < C 4 for the combination of capacitors shown, the equivalent capacitance A) is less than C 1. B) is more than C 4. C) is between C 2 and C 3. D) is less than C 2. E) could be any value depending on the applied voltage. 98. If C 1 < C 2 < C 3 < C 4 for the combination of capacitors shown, the equivalent capacitance A) is less than C 1. B) is more than C 4. C) is between C 2 and C 3. D) is more than C 2. E) could be any value depending on the applied voltage. Page 33 of 40

34 99. You want to use three capacitors in a circuit. If each capacitor has a capacitance of 3 pf, the configuration that gives you an equivalent capacitance of 2 pf between points x and y is A) 1 B) 2 C) 3 D) 4 E) None of these is correct Three capacitors 2 µf, 4 µf and 8 µf are connected in parallel across a 120-V source. The charge on the 4 µf capacitor is A) C B) C C) C D) C E) C 101. If all the four capacitors have equal values of 50 µf then calculate the equivalent capacitance of the circuit shown. A) 50 µf B) 30 µf C) 75 µf D) 100 µf E) 83 µf Page 34 of 40

35 102. A capacitor, C 1 = 5.0 µf, is charged up to 8 V. It is then connected to a second uncharged capacitor C 2 = 2.5 µf. The charge on C 1 after the system has come to equilibrium is A) 26.7 µc B) 13.3 µc C) 20.0 µc D) 40.0 µc E) 6.67 µc 103. A capacitor is made with two strips of metal foil, each 2.5 cm wide by 50 cm long, with a 0.70-µm thick strip of paper (κ = 3.7) sandwiched between them. The capacitor is rolled up to save space. What is the capacitance of this device? (The permittivity of free space ε 0 = F/m.) A) 43 nf B) 0.16 µf C) 0.58 µf D) 2.0 µf E) 7.3 µf 104. When you insert a piece of paper (κ = 3.7) into the air between the plates of a capacitor, the capacitance A) increases. B) decreases. C) does not change. D) could increase, decrease, or not change depending on the dielectric constant of the paper. E) does none of these. Page 35 of 40

36 105. A capacitor is connected to a battery as shown. When a dielectric is inserted between the plates of the capacitor, A) only the capacitance changes. B) only the voltage across the capacitor changes. C) only the charge on the capacitor changes. D) both the capacitance and the voltage change. E) both the capacitance and the charge change The capacitance of a parallel-plate capacitor is 24 µf when the plates are separated by a material of dielectric constant 2.0. If this material is removed, leaving air between the plates, and the separation between the plates is tripled, the capacitance is A) unchanged B) 16 µf C) 36 µf D) 0.14 mf E) 4.0 µf 107. Two identical capacitors A and B are connected across a battery, as shown. If mica (κ = 5.4) is inserted in B, A) both capacitors will retain the same charge. B) B will have the larger charge. C) A will have the larger charge. D) the potential difference across B will increase. E) the potential difference across A will increase. Page 36 of 40

37 108. Two parallel plate air capacitors, each of capacitance X F are in series with a battery of 12-V. If a dielectric with κ = 3 is inserted between the plates of one of the capacitors, then calculate the change in electrical charge (in Coulombs) that occurs on one of its plates. A) 9X B) 3X/4 C) 3X D) 16X E) none of the above 109. The space between the inner wire of radius a = 1 mm of a co-axial cable and the conducting shield of radius b = 8 mm is made of nylon (κ = 4.2). A potential difference of 20 V is maintained between the wire and the shield. The energy stored per meter of the cable is A) 1.12 nj/m B) 22.5 nj/m C) 44.9 nj/m D) 5.36 nj/m E) 2.68 nj/m 110. A 1.0-µF capacitor and a 2.0-µF capacitor are connected in series across a 1200-V source. The charge on each capacitor is A) 0.40 mc B) 0.80 mc C) 1.2 mc D) 1.8 mc E) 3.6 mc Page 37 of 40

38 Answer Key - practice questions for chapters C 2. B 3. A 4. B 5. A 6. C 7. C 8. C 9. D 10. A 11. A 12. A 13. B 14. A 15. A 16. B 17. A 18. D 19. B 20. D 21. A 22. D 23. A 24. C 25. C 26. E 27. B 28. B 29. A 30. C 31. D 32. A 33. D 34. D 35. B 36. B 37. D 38. C 39. E 40. A 41. A 42. D 43. B 44. B Page 38 of 40

39 45. A 46. C 47. B 48. C 49. E 50. E 51. E 52. D 53. E 54. A 55. A 56. C 57. E 58. E 59. B 60. D 61. E 62. B 63. C 64. A 65. B 66. E 67. C 68. D 69. A 70. E 71. C 72. A 73. A 74. C 75. D 76. B 77. A 78. C 79. A 80. D 81. A 82. B 83. C 84. E 85. A 86. A 87. C 88. A 89. C 90. A Page 39 of 40

40 91. C 92. D 93. B 94. C 95. D 96. B 97. B 98. A 99. D 100. E 101. B 102. A 103. C 104. A 105. E 106. E 107. B 108. C 109. B 110. B Page 40 of 40

### Physics 1653 Exam 3 - Review Questions

Physics 1653 Exam 3 - Review Questions 3.0 Two uncharged conducting spheres, A and B, are suspended from insulating threads so that they touch each other. While a negatively charged rod is held near, but

### HW6 Solutions Notice numbers may change randomly in your assignments and you may have to recalculate solutions for your specific case.

HW6 Solutions Notice numbers may change randomly in your assignments and you may have to recalculate solutions for your specific case. Tipler 22.P.053 The figure below shows a portion of an infinitely

### Chapter 16 Electric Forces and Fields

Chapter 16 Electric Forces and Fields 2. How many electrons does it take to make one coulomb of negative charge? A. 1.00 10 9 B. 6.25 10 18 C. 6.02 10 23 D. 1.66 10 18 E. 2.24 10 4 10. Two equal point

Last Name: First Name: Physics 102 Spring 2007: Exam #1 Multiple-Choice Questions 1. Two small conducting spheres attract one another electrostatically. This can occur for a variety of reasons. Which of

### Electrostatics Problems

Name AP Physics B Electrostatics Problems Date Mrs. Kelly 1. How many excess electrons are contained in a charge of 30 C? 2. Calculate and compare the gravitational and electrostatic force between an electron

### Exam 1 Solutions. PHY2054 Fall 2014. Prof. Paul Avery Prof. Andrey Korytov Sep. 26, 2014

Exam 1 Solutions Prof. Paul Avery Prof. Andrey Korytov Sep. 26, 2014 1. Charges are arranged on an equilateral triangle of side 5 cm as shown in the diagram. Given that q 1 = 5 µc and q 2 = q 3 = 2 µc

### CHAPTER 26 ELECTROSTATIC ENERGY AND CAPACITORS

CHAPTER 6 ELECTROSTATIC ENERGY AND CAPACITORS. Three point charges, each of +q, are moved from infinity to the vertices of an equilateral triangle of side l. How much work is required? The sentence preceding

### Review Questions PHYS 2426 Exam 2

Review Questions PHYS 2426 Exam 2 1. If 4.7 x 10 16 electrons pass a particular point in a wire every second, what is the current in the wire? A) 4.7 ma B) 7.5 A C) 2.9 A D) 7.5 ma E) 0.29 A Ans: D 2.

### Fall 12 PHY 122 Homework Solutions #4

Fall 12 PHY 122 Homework Solutions #4 Chapter 23 Problem 45 Calculate the electric potential due to a tiny dipole whose dipole moment is 4.8 x 10-30 C.m at a point 4.1 x 10-9 m away if this point is (a)

Last Name: First Name: Physics 102 Spring 2006: Exam #2 Multiple-Choice Questions 1. A charged particle, q, is moving with speed v perpendicular to a uniform magnetic field. A second identical charged

### PH 212 07-31-2015 Physics 212 Exam-3 Solution NAME: Write down your name also on the back of the package of sheets you turn in.

PH 1 7-31-15 Physics 1 Exam-3 Solution NAME: Write down your name also on the back of the package of sheets you turn in. SIGNATURE and ID: Return this hard copy exam together with your other answer sheets.

### CET Moving Charges & Magnetism

CET 2014 Moving Charges & Magnetism 1. When a charged particle moves perpendicular to the direction of uniform magnetic field its a) energy changes. b) momentum changes. c) both energy and momentum

### MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) If the voltage at a point in space is zero, then the electric field must be A) zero. B) positive.

### Chapter 22: Electric Flux and Gauss s Law

22.1 ntroduction We have seen in chapter 21 that determining the electric field of a continuous charge distribution can become very complicated for some charge distributions. t would be desirable if we

### Electromagnetism Extra Study Questions Short Answer

Electromagnetism Extra Study Questions Short Answer 1. The electrostatic force between two small charged objects is 5.0 10 5 N. What effect would each of the following changes have on the magnitude of

### Magnetism. d. gives the direction of the force on a charge moving in a magnetic field. b. results in negative charges moving. clockwise.

Magnetism 1. An electron which moves with a speed of 3.0 10 4 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 10 19 C) a. 4.8 10 14 N c. 2.2 10 24 N b.

### Physics 126 Practice Exam #3 Professor Siegel

Physics 126 Practice Exam #3 Professor Siegel Name: Lab Day: 1. Which one of the following statements concerning the magnetic force on a charged particle in a magnetic field is true? A) The magnetic force

### Physics 210 Q ( PHYSICS210BRIDGE ) My Courses Course Settings

1 of 16 9/7/2012 1:10 PM Logged in as Julie Alexander, Instructor Help Log Out Physics 210 Q1 2012 ( PHYSICS210BRIDGE ) My Courses Course Settings Course Home Assignments Roster Gradebook Item Library

### 1. Units of a magnetic field might be: A. C m/s B. C s/m C. C/kg D. kg/c s E. N/C m ans: D

Chapter 28: MAGNETIC FIELDS 1 Units of a magnetic field might be: A C m/s B C s/m C C/kg D kg/c s E N/C m 2 In the formula F = q v B: A F must be perpendicular to v but not necessarily to B B F must be

### Physics 121 Sample Common Exam 3 NOTE: ANSWERS ARE ON PAGE 6. Instructions: 1. In the formula F = qvxb:

Physics 121 Sample Common Exam 3 NOTE: ANSWERS ARE ON PAGE 6 Signature Name (Print): 4 Digit ID: Section: Instructions: Answer all questions 24 multiple choice questions. You may need to do some calculation.

### Phys222 Winter 2012 Quiz 4 Chapters 29-31. Name

Name If you think that no correct answer is provided, give your answer, state your reasoning briefly; append additional sheet of paper if necessary. 1. A particle (q = 5.0 nc, m = 3.0 µg) moves in a region

### 1. The diagram below represents magnetic lines of force within a region of space.

1. The diagram below represents magnetic lines of force within a region of space. 4. In which diagram below is the magnetic flux density at point P greatest? (1) (3) (2) (4) The magnetic field is strongest

### PHYS 211 FINAL FALL 2004 Form A

1. Two boys with masses of 40 kg and 60 kg are holding onto either end of a 10 m long massless pole which is initially at rest and floating in still water. They pull themselves along the pole toward each

### Multiple Choice Questions for Physics 1 BA113 Chapter 23 Electric Fields

Multiple Choice Questions for Physics 1 BA113 Chapter 23 Electric Fields 63 When a positive charge q is placed in the field created by two other charges Q 1 and Q 2, each a distance r away from q, the

### Chapter 18 Electric Forces and Electric Fields. Key Concepts:

Chapter 18 Lectures Monday, January 25, 2010 7:33 AM Chapter 18 Electric Forces and Electric Fields Key Concepts: electric charge principle of conservation of charge charge polarization, both permanent

### PHYS 222 Spring 2012 Final Exam. Closed books, notes, etc. No electronic device except a calculator.

PHYS 222 Spring 2012 Final Exam Closed books, notes, etc. No electronic device except a calculator. NAME: (all questions with equal weight) 1. If the distance between two point charges is tripled, the

### HW7 Solutions Notice numbers may change randomly in your assignments and you may have to recalculate solutions for your specific case.

HW7 Solutions Notice numbers may change randomly in your assignments and you may have to recalculate solutions for your specific case. Tipler 24.P.021 (a) Find the energy stored in a 20.00 nf capacitor

### Physics 9 Fall 2009 Homework 2 - Solutions

Physics 9 Fall 009 Homework - s 1. Chapter 7 - Exercise 5. An electric dipole is formed from ±1.0 nc charges spread.0 mm apart. The dipole is at the origin, oriented along the y axis. What is the electric

### Fall 12 PHY 122 Homework Solutions #8

Fall 12 PHY 122 Homework Solutions #8 Chapter 27 Problem 22 An electron moves with velocity v= (7.0i - 6.0j)10 4 m/s in a magnetic field B= (-0.80i + 0.60j)T. Determine the magnitude and direction of the

### Physics 2212 GH Quiz #4 Solutions Spring 2015

Physics 1 GH Quiz #4 Solutions Spring 15 Fundamental Charge e = 1.6 1 19 C Mass of an Electron m e = 9.19 1 31 kg Coulomb constant K = 8.988 1 9 N m /C Vacuum Permittivity ϵ = 8.854 1 1 C /N m Earth s

### AP2 Electrostatics. Three point charges are located at the corners of a right triangle as shown, where q 1. are each 1 cm from q 3.

Three point charges are located at the corners of a right triangle as shown, where q 1 = q 2 = 3 µc and q 3 = -4 µc. If q 1 and q 2 are each 1 cm from q 3, what is the magnitude of the net force on q 3?

### Exam 1 Practice Problems Solutions

MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8 Spring 13 Exam 1 Practice Problems Solutions Part I: Short Questions and Concept Questions Problem 1: Spark Plug Pictured at right is a typical

### Chapter 17: Electric Potential

hapter 17: Electric Potential Electric Potential Energy Electric Potential How are the E-field and Electric Potential related? Motion of Point harges in an E-field apacitors Dielectrics 1 Electric Potential

### Solution: (a) For a positively charged particle, the direction of the force is that predicted by the right hand rule. These are:

Problem 1. (a) Find the direction of the force on a proton (a positively charged particle) moving through the magnetic fields as shown in the figure. (b) Repeat part (a), assuming the moving particle is

### Exam 2 Solutions. PHY2054 Spring Prof. P. Kumar Prof. P. Avery March 5, 2008

Prof. P. Kumar Prof. P. Avery March 5, 008 Exam Solutions 1. Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R 1 and R, have different radii, r 1 and

### Coefficient of Potential and Capacitance

Coefficient of Potential and Capacitance Lecture 12: Electromagnetic Theory Professor D. K. Ghosh, Physics Department, I.I.T., Bombay We know that inside a conductor there is no electric field and that

### PHYS 101-4M, Fall 2005 Exam #3. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

PHYS 101-4M, Fall 2005 Exam #3 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A bicycle wheel rotates uniformly through 2.0 revolutions in

### 1. A wire carries 15 A. You form the wire into a single-turn circular loop with magnetic field 80 µ T at the loop center. What is the loop radius?

CHAPTER 3 SOURCES O THE MAGNETC ELD 1. A wire carries 15 A. You form the wire into a single-turn circular loop with magnetic field 8 µ T at the loop center. What is the loop radius? Equation 3-3, with

### Candidate Number. General Certificate of Education Advanced Level Examination June 2014

entre Number andidate Number Surname Other Names andidate Signature General ertificate of Education dvanced Level Examination June 214 Physics PHY4/1 Unit 4 Fields and Further Mechanics Section Wednesday

### A satellite of mass 5.00x10² kg is in a circular orbit of radius 2r around Earth. Then it is moved to a circular orbit radius of 3r.

Supplemental Questions A satellite of mass 5.00x10² kg is in a circular orbit of radius 2r around Earth. Then it is moved to a circular orbit radius of 3r. (a) Determine the satellite s GPE in orbit. (b)

### 1 of 7 3/23/2010 2:45 PM

1 of 7 3/23/2010 2:45 PM Chapter 30 Homework Due: 8:00am on Tuesday, March 23, 2010 Note: To understand how points are awarded, read your instructor's Grading Policy. [Return to Standard Assignment View]

### physics 111N electric potential and capacitance

physics 111N electric potential and capacitance electric potential energy consider a uniform electric field (e.g. from parallel plates) note the analogy to gravitational force near the surface of the Earth

### Chapter 18. Electric Forces and Electric Fields

My lecture slides may be found on my website at http://www.physics.ohio-state.edu/~humanic/ ------------------------------------------------------------------- Chapter 18 Electric Forces and Electric Fields

### electron due to the magnetic field. (b) Repeat your calculation for a proton having the same velocity.

PROBLEMS sec. 28-3 The Definition of 1 A proton traveling at 23.0 with respect to the direction of a magnetic field of strength 2.60 mt experiences a magnetic force of 6.50 10-17 N. Calculate (a) the proton's

### Profs. A. Petkova, A. Rinzler, S. Hershfield. Exam 2 Solution

PHY2049 Fall 2009 Profs. A. Petkova, A. Rinzler, S. Hershfield Exam 2 Solution 1. Three capacitor networks labeled A, B & C are shown in the figure with the individual capacitor values labeled (all units

### ( )( 10!12 ( 0.01) 2 2 = 624 ( ) Exam 1 Solutions. Phy 2049 Fall 2011

Phy 49 Fall 11 Solutions 1. Three charges form an equilateral triangle of side length d = 1 cm. The top charge is q = - 4 μc, while the bottom two are q1 = q = +1 μc. What is the magnitude of the net force

### Chapter 3. Gauss s Law

3 3 3-0 Chapter 3 Gauss s Law 3.1 Electric Flux... 3-2 3.2 Gauss s Law (see also Gauss s Law Simulation in Section 3.10)... 3-4 Example 3.1: Infinitely Long Rod of Uniform Charge Density... 3-9 Example

### Candidate Number. General Certificate of Education Advanced Level Examination June 2012

entre Number andidate Number Surname Other Names andidate Signature General ertificate of Education dvanced Level Examination June 212 Physics PHY4/1 Unit 4 Fields and Further Mechanics Section Monday

### Chapter 25: Capacitance

Chapter 25: Capacitance Most of the fundamental ideas of science are essentially simple, and may, as a rule, be expressed in a language comprehensible to everyone. Albert Einstein 25.1 Introduction Whenever

### PHYSICS PAPER 1 (THEORY)

PHYSICS PAPER 1 (THEORY) (Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) ---------------------------------------------------------------------------------------------------------------------

### Homework #8 203-1-1721 Physics 2 for Students of Mechanical Engineering. Part A

Homework #8 203-1-1721 Physics 2 for Students of Mechanical Engineering Part A 1. Four particles follow the paths shown in Fig. 32-33 below as they pass through the magnetic field there. What can one conclude

### Candidate Number. General Certificate of Education Advanced Level Examination June 2010

entre Number andidate Number Surname Other Names andidate Signature General ertificate of Education dvanced Level Examination June 1 Physics PHY4/1 Unit 4 Fields and Further Mechanics Section Friday 18

### MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics. 8.02 Spring 2013 Conflict Exam Two Solutions

MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 802 Spring 2013 Conflict Exam Two Solutions Problem 1 (25 points): answers without work shown will not be given any credit A uniformly charged

### Electric Forces & Fields, Gauss s Law, Potential

This test covers Coulomb s Law, electric fields, Gauss s Law, electric potential energy, and electric potential, with some problems requiring a knowledge of basic calculus. Part I. Multiple Choice +q +2q

### ELECTRIC FIELD LINES AND EQUIPOTENTIAL SURFACES

ELECTRIC FIELD LINES AND EQUIPOTENTIAL SURFACES The purpose of this lab session is to experimentally investigate the relation between electric field lines of force and equipotential surfaces in two dimensions.

### Physics 2A, Sec B00: Mechanics -- Winter 2011 Instructor: B. Grinstein Final Exam

Physics 2A, Sec B00: Mechanics -- Winter 2011 Instructor: B. Grinstein Final Exam INSTRUCTIONS: Use a pencil #2 to fill your scantron. Write your code number and bubble it in under "EXAM NUMBER;" an entry

### 226 Chapter 15: OSCILLATIONS

Chapter 15: OSCILLATIONS 1. In simple harmonic motion, the restoring force must be proportional to the: A. amplitude B. frequency C. velocity D. displacement E. displacement squared 2. An oscillatory motion

### Q28.1 A positive point charge is moving to the right. The magnetic field that the point charge produces at point P (see diagram below) P

Q28.1 A positive point charge is moving to the right. The magnetic field that the point charge produces at point P (see diagram below) P r + v r A. points in the same direction as v. B. points from point

### Electrostatics-E Field

1. Which diagram represents the electric field lines between two small electrically charged spheres? 2. Which graph best represents the relationship between the magnitude of the electric field strength,

Week 8 homework IMPORTANT NOTE ABOUT WEBASSIGN: In the WebAssign versions of these problems, various details have been changed, so that the answers will come out differently. The method to find the solution

### Q24.1 The two conductors a and b are insulated from each other, forming a capacitor. You increase the charge on a to +2Q and increase the charge on b

Q24.1 The two conductors a and b are insulated from each other, forming a capacitor. You increase the charge on a to +2Q and increase the charge on b to 2Q, while keeping the conductors in the same positions.

### Electricity Review-Sheet

Name: ate: 1. The unit of electrical charge in the MKS system is the. volt. ampere. coulomb. mho 2. Which sketch best represents the charge distribution around a neutral electroscope when a positively

### Chapter 26. Capacitance and Dielectrics

Chapter 26 Capacitance and Dielectrics Capacitors Capacitors are devices that store electric charge Examples where capacitors are used: radio receivers filters in power supplies energy-storing devices

### Physics 112 Homework 5 (solutions) (2004 Fall) Solutions to Homework Questions 5

Solutions to Homework Questions 5 Chapt19, Problem-2: (a) Find the direction of the force on a proton (a positively charged particle) moving through the magnetic fields in Figure P19.2, as shown. (b) Repeat

### Physics 210 Q1 2012 ( PHYSICS210BRIDGE ) My Courses Course Settings

1 of 11 9/7/2012 1:06 PM Logged in as Julie Alexander, Instructor Help Log Out Physics 210 Q1 2012 ( PHYSICS210BRIDGE ) My Courses Course Settings Course Home Assignments Roster Gradebook Item Library

### Capacitance, Resistance, DC Circuits

This test covers capacitance, electrical current, resistance, emf, electrical power, Ohm s Law, Kirchhoff s Rules, and RC Circuits, with some problems requiring a knowledge of basic calculus. Part I. Multiple

### Chapter 13. Gravitation

Chapter 13 Gravitation 13.2 Newton s Law of Gravitation In vector notation: Here m 1 and m 2 are the masses of the particles, r is the distance between them, and G is the gravitational constant. G = 6.67

### v 2 = v a(x x 0 ) and v = 0 a = v2 0 2d = K md F net = qe = ma E = ma e = K ed = V/m dq = λ ds de r = de cosθ = 1 λ ds = r dθ E r =

Physics 11 Honors Final Exam Spring 003 Name: Section: Closed book exam. Only one 8.5 11 formula sheet (front and back side) can be used. Calculators are allowed. Use the scantron forms (pencil only!)

### Physics 25 Exam 3 November 3, 2009

1. A long, straight wire carries a current I. If the magnetic field at a distance d from the wire has magnitude B, what would be the the magnitude of the magnetic field at a distance d/3 from the wire,

### Pre-Lab 7 Assignment: Capacitors and RC Circuits

Name: Lab Partners: Date: Pre-Lab 7 Assignment: Capacitors and RC Circuits (Due at the beginning of lab) Directions: Read over the Lab Handout and then answer the following questions about the procedures.

### Sample Questions for the AP Physics 1 Exam

Sample Questions for the AP Physics 1 Exam Sample Questions for the AP Physics 1 Exam Multiple-choice Questions Note: To simplify calculations, you may use g 5 10 m/s 2 in all problems. Directions: Each

### As customary, choice (a) is the correct answer in all the following problems.

PHY2049 Summer 2012 Instructor: Francisco Rojas Exam 1 As customary, choice (a) is the correct answer in all the following problems. Problem 1 A uniformly charge (thin) non-conucting ro is locate on the

### Electrical Energy, Potential and Capacitance. AP Physics B

Electrical Energy, Potential and Capacitance AP Physics B Electric Fields and WORK In order to bring two like charges near each other work must be done. In order to separate two opposite charges, work

### Exam 2 Practice Problems Part 1 Solutions

MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics Exam Practice Problems Part 1 Solutions Problem 1 Electric Field and Charge Distributions from Electric Potential An electric potential V ( z

### 104 Practice Exam 2-3/21/02

104 Practice Exam 2-3/21/02 1. Two electrons are located in a region of space where the magnetic field is zero. Electron A is at rest; and electron B is moving westward with a constant velocity. A non-zero

### TEACHER S CLUB EXAMS GRADE 11. PHYSICAL SCIENCES: PHYSICS Paper 1

TEACHER S CLUB EXAMS GRADE 11 PHYSICAL SCIENCES: PHYSICS Paper 1 MARKS: 150 TIME: 3 hours INSTRUCTIONS AND INFORMATION 1. This question paper consists of 12 pages, two data sheets and a sheet of graph

### CHAPTER 24 GAUSS S LAW

CHAPTER 4 GAUSS S LAW 4. The net charge shown in Fig. 4-40 is Q. Identify each of the charges A, B, C shown. A B C FIGURE 4-40 4. From the direction of the lines of force (away from positive and toward

### Force on Moving Charges in a Magnetic Field

[ Assignment View ] [ Eðlisfræði 2, vor 2007 27. Magnetic Field and Magnetic Forces Assignment is due at 2:00am on Wednesday, February 28, 2007 Credit for problems submitted late will decrease to 0% after

### 1) Magnetic field lines come out of the south pole of a magnet and enter at the north pole.

Exam Name 1) Magnetic field lines come out of the south pole of a magnet and enter at the north pole. 2) Which of the following statements is correct? A) Earth's north pole is magnetic north. B) The north

### Problem 1 (25 points)

MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.02 Spring 2012 Exam Three Solutions Problem 1 (25 points) Question 1 (5 points) Consider two circular rings of radius R, each perpendicular

### Chapter 23 Electric Potential. Copyright 2009 Pearson Education, Inc.

Chapter 23 Electric Potential 23-1 Electrostatic Potential Energy and Potential Difference The electrostatic force is conservative potential energy can be defined. Change in electric potential energy is

### Physics II Exam 2 Review

Physics II Exam 2 Review Christopher Lane 1,2 Justin Lucas 1,3 Julia Bielaski 1,2 1 Department Physics, Clarkson University 2 Department Mathematics, Clarkson University 3 Department Electrical and Computer

### Chapter 14 Magnets and

Chapter 14 Magnets and Electromagnetism How do magnets work? What is the Earth s magnetic field? Is the magnetic force similar to the electrostatic force? Magnets and the Magnetic Force! We are generally

### Exercises on Voltage, Capacitance and Circuits. A d = (8.85 10 12 ) π(0.05)2 = 6.95 10 11 F

Exercises on Voltage, Capacitance and Circuits Exercise 1.1 Instead of buying a capacitor, you decide to make one. Your capacitor consists of two circular metal plates, each with a radius of 5 cm. The

### Question Details C14: Magnetic Field Direction Abbott [ ]

Phys 1114: Assignment 9 Abbott (5420633) Due: Mon Apr 7 2014 11:59 PM CDT Question 1 2 3 4 5 6 7 8 9 10 11 1. Question Details C14: Magnetic Field Direction Abbott [2861537] a) A wire is oriented horizontally

### Potential and voltage. Electric forces exert on any charge placed in the electric field

Potential and voltage q F Electric forces exert on any charge placed in the electric field The electric field E has the magnitude and the direction (it is a vector) The direction of the field is taken

### Chapter 7: Polarization

Chapter 7: Polarization Joaquín Bernal Méndez Group 4 1 Index Introduction Polarization Vector The Electric Displacement Vector Constitutive Laws: Linear Dielectrics Energy in Dielectric Systems Forces

### Chapter 19 Magnetic Forces and Fields

Chapter 19 Magnetic Forces and Fields Student: 3. The magnetism of the Earth acts approximately as if it originates from a huge bar magnet within the Earth. Which of the following statements are true?

### PHYS-2020: General Physics II Course Lecture Notes Section II

PHYS-2020: General Physics II Course Lecture Notes Section II Dr. Donald G. Luttermoser East Tennessee State University Edition 4.0 Abstract These class notes are designed for use of the instructor and

### AP2 Magnetism. (c) Explain why the magnetic field does no work on the particle as it moves in its circular path.

A charged particle is projected from point P with velocity v at a right angle to a uniform magnetic field directed out of the plane of the page as shown. The particle moves along a circle of radius R.

### B) 40.8 m C) 19.6 m D) None of the other choices is correct. Answer: B

Practice Test 1 1) Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.60 s and reaches the level of the top of the pole after a total elapsed time

### Name: Date: Regents Physics Mr. Morgante UNIT 4B Magnetism

Name: Regents Physics Date: Mr. Morgante UNIT 4B Magnetism Magnetism -Magnetic Force exists b/w charges in motion. -Similar to electric fields, an X stands for a magnetic field line going into the page,

### Solution. Problem. Solution. Problem. Solution

4. A 2-g ping-pong ball rubbed against a wool jacket acquires a net positive charge of 1 µc. Estimate the fraction of the ball s electrons that have been removed. If half the ball s mass is protons, their

### Progetto Orientamento in rete

Progetto Orientamento in rete Unità 1: Newton s law of gravitation and Gravitational field Unità 2: Gravitational potential energy Unità 3: Coulomb s law and Electric field Unità 4: Magnetic field Prof.ssa

### The Electric Force. From mechanics, the relationship for the gravitational force on an object is: m is the mass of the particle of interest,

. The Electric Force Concepts and Principles The Gravitational Analogy In introducing the concept of the electric field, I tried to illustrate it by drawing an analogy with the gravitational field, g.

### Course Syllabus: AP Physics C Electricity and Magnetism

Course Syllabus: AP Physics C Electricity and Magnetism Course Description: AP Physics C is offered as a second year physics course to students who are planning to major in the physical sciences or in

### Chapter 4. Electrostatic Fields in Matter

Chapter 4. Electrostatic Fields in Matter 4.1. Polarization A neutral atom, placed in an external electric field, will experience no net force. However, even though the atom as a whole is neutral, the

### Physics 9e/Cutnell. correlated to the. College Board AP Physics 1 Course Objectives

Physics 9e/Cutnell correlated to the College Board AP Physics 1 Course Objectives Big Idea 1: Objects and systems have properties such as mass and charge. Systems may have internal structure. Enduring