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


 Mervin Kelley
 2 years ago
 Views:
Transcription
1 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 r, and different lengths, L 1 and L. Which of the following relative values for radii and lengths would result in equal resistances? (1) r 1 = r and 4L 1 = L () r 1 = r and L 1 = L (3) r 1 = r and 4L 1 = L (4) r 1 = r and L 1 = L The resistance is given by R = ρl/ A, where ρ is the resistivity, L is the length and A is the cross sectional area. To keep R unchanged, the ratio of L to A must be unchanged. Since A = πr, if r is doubled then L must be multiplied by 4. Only the answer (1) works.. If a 9.0V battery with internal resistance 0. Ω and an 18 Ω resistor are connected together, what is the amount of electrical energy (in J) transformed to heat per coulomb of charge that flows through the circuit? (1) 9.0 () 3.0 (3) 0.50 (4) 7 (5) 4.5 The amount of heat released is PΔt, where P = Vi. The total amount of charge is q = iδt. Thus the amount of heat energy released per coulomb of charge is PΔt / iδt = P/i = V = 9V. 1
2 3. (054 exam, #1, 006) At room temperature conditions of 5 C, a circuit containing a metal resistor connected to a 50 V battery has a current of.00 A. When the wire is heated to 145 C the current drops to 1.94 A. What is the temperature coefficient of resistivity of this metal? (1) / C () / C (3) / C (4) / C (5) / C The resistance at 5 C is 50 /.00 = 5 Ω. The resistance at 145 C is 50 / 1.94 = Ω. Thus the temperature coefficient of resistivity is / 5.0 / 10 = / C. 4. (Chap. 18.9) Consider the circuit shown here, with R = 15 Ω. What is the potential difference between points a and b? 10 5 V (1) 5.56 V () 19.4 V (3) 5 V (4) 1.3 V (5) None of these a 10 5 R 5 This circuit is equivalent to a 10 Ω resistor in series with a parallel combination of 10 Ω, 5 Ω and 0 Ω, yield a total resistance of 1.86 Ω. Thus the total current is 5 / 1.86 = A. The voltage difference is thus *10 = 5.56 V. b 5. (049 Exam, #4, Fall 07) Consider the circuit shown in the accompanying figure. What is the power dissipated (in watts) in the 5 Ω resistor? (1) 0.43 () 0.11 (3) 0.8 (4).35 (5) i 1 i The two equations from Kirchoff s rules are 1 i 5( i + i ) = 0 and i ( i i ) 1 1 Solving yields i 1 + i = 5/17 = 0.94 A. So the power is = 0.43 W. 5 + = 0. 1
3 6. (Test Bank 6) When a 4.0Ω resistor is connected across a 1.0V battery, a current of 48 ma flows. What is the internal resistance of the battery? (1) 0.9 Ω () 0.0 Ω (3) 5.0 Ω (4) 49.8 Ω (5) 0.008Ω The total resistance is R = 1.0 / 0.48 = 4.90 Ω. Thus the internal resistance is 0.9 Ω. 7. (Test Bank 7) Two resistors of values 6.0 and 1.0 Ω are connected in parallel. This combination in turn is hooked in series with a.0 Ω resistor and a 4 V battery. What is the current in amps in the 6 Ω resistor? (1).7 () 4.0 (3) 6.0 (4) 1.3 (5) 8.0 The parallel combination yields a resistance of 4 Ω and thus the total resistance is 6.0 Ω. The total current is thus 4 / 6.0 = 4 A. To find the current in the 6 Ω branch, first find the voltage across it, which is the same as the voltage across the parallel combination. This voltage is determined from 4 4* = 16 V. Thus the current is 16 / 6 =.67 A. 8. (Test Bank 45) What is the current through the 8 Ω resistor? (1) 1.5 A () 0.50 A (3) 1.0 A (4).0 A Let i 1 be the current flowing to the right in the middle branch, and i be the current flowing to the left in the lower branch. The two equations from Kirchhoff s rule are 16 4(i i 1 ) +1i 1 18 = 0 and 18 1i 1 8i = 0. We are solving for i only, which yields i = 1.5 A. 3
4 9. (054 exam #6, Spring 007) In the circuit shown, the internal resistance of the battery is 0.1 Ω and the capacitors are initially uncharged. The current (in A) flowing in the 6 Ω resistor an instant after the switch is closed is (1).5 () 4.9 (3) 3.9 (4) 3.3 (5) zero Just after the switch is thrown, the capacitors have no effect. The current is therefore calculated from 0 / 8.1 =.5 A. 10. In the circuit shown, the switch S is open and the capacitor (C =.5 μf) is initially uncharged. The switch is then closed long enough to allow the capacitor to fully charge. If the switch is now opened, how much time (in μsec) is required for the potential difference across the capacitor to reach V? (1) 7 () 1.9 (3) 5. (4) 40 (5) When the capacitor is fully charged, the voltage across it is 15 V. After the switch is opened, it discharges through a resistor combination equivalent to 5.33 Ω. The equation describing the 15exp t/ RC t = ln 15 / = 7 μs. voltage on the capacitor is ( ) =, which yields ( )( ) ( ) 11. (Test Bank 19) If a proton is released at the equator and falls toward the Earth under the influence of gravity, in which direction is the magnetic force on the proton? (1) east () south (3) north (4) west (5) up The field lines point north to the geomagnetic south pole at the north geographic pole. Using the right hand rule yields a direction of east. 4
5 1. (Test Bank 30) A horizontal currentcarrying wire of length 50 cm and mass 0. kg is placed perpendicular to a uniform horizontal magnetic field of magnitude 0.7 T. For what current will the wire float due to the magnetic force acting upward on it? (g = 9.8 m/s ) (1) 14.5 A () 1.5 A (3) 3.9 A (4) 5 ma (5) 150 ma Balance of gravitational and magnetic forces leads to the equation mg = BiL. Solving for i yields 14.5 A. 13. (Test Bank 39) A rectangular coil (0.0 m 0.80 m) has 00 turns and is placed in a uniform magnetic field of 0.30 T. If the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is N m. What is the current in the coil? (1) 8.3 ma () 1.7 A (3).5 ma (4) 1.0 A (5) 50 ma The maximum torque on the coil is τ = NAiB, where N = 00, A = = 0.1 m, τ = and B = 0.30 T. Solving for i yields 8.3 ma. 14. (Chap ) A singly charged positive ion has a mass of kg. After being accelerated through a potential difference of 3 V, the ion enters a magnetic field of T, in a direction perpendicular to the field. Calculate the radius of the path of the ion in the field. (1) 1.49 cm () 1.77 cm (3) 8.8 mm (4) 4.5 cm The radius is found by equating the centripetal force to the magnetic force, or mv r = evb, which yields r = mv/ eb. From the acceleration over a potential, we can also write mv = ev. Putting these together yields the equation r = mv / e/ B. Solving for r yields 1.49 cm. / 1 5
6 15. (Chap ) A lightning bolt may carry a current of A for a short time. What is the resulting magnetic field 190 m from the bolt in μt? Suppose that the bolt extends far above and below the point of observation. (1) 10.5 () 0.00 (3) 10 (4) 66.1 The B field at a distance r from a long straight wire, which is what the lightning bolt essentially B μ i / πr = = /190 = T = 10.5 μt. is, is given by 0 ( )( ) 16. (PHY 049 exam #9, Fall 007) Four long parallel wires are arranged on a plane, as shown in the attached figure, with.0 cm gaps between them. Each wire carries a 6.0 A current in the direction indicated by the arrow. On the wire labeled B, what is the magnetic force per meter in N/m? (1) () (3) (4) (5) We first note that wire B is repelled from both A and C, so there is no net effect from them. The only net force is with D. A quick calculation yields the value of the force per unit length as 0 AC ( ) ( ) 7 4 F / L= μ i i / πd = 4π / π 0.04 = N/m. 17. (PHY054 exam, #1, Spring 006) A long straight wire and a rectangular conducting loop lie in the same plane as shown. If the current in the long wire is decreasing, what is the direction of the net force exerted on the loop? (1) up () down (3) out of the page (4) into the page (5) zero The induced current in the loop is clockwise from Lenz law. From the right hand rule, the force on the current in the upper branch is up and on the lower branch is down. However, the B field is stronger at the upper branch, so the net force is up. (The forces on the left and right branches cancel because each element of each branch encounters the exact same B field.) 6
7 18. (Chap. 0.18) Consider the arrangement shown in the figure. Assume that R = 4.0 Ω and L = 1. m, and that a uniform.8 T magnetic field is directed into the page. The bar is moving at a speed of m/s. What is the current in amps through the resistor R? (1) 0.6 () 0.5 (3) 0.4 (4) 0.7 (5) 0.3 X X X X X X X X X X X vx X X X RX X LX X X X X X X X X The emf is given by E = BLv, so the current is BLv / R, yielding 0.6 A. 19. (Chap. 0.1) A 480 turn circularloop coil 7.5 cm in radius is initially aligned so that its axis is parallel to the Earth's magnetic field. In.77 ms, the coil is flipped so that its axis is perpendicular to the Earth's magnetic field. If an average voltage of V is thereby induced in the coil, what is the value of the Earth's magnetic field (in μt) at that location? (1) 59 () 48 (3) 65 (4) 39 (5) 43 The emf for a circular coil which is rotated in this way is E = Nπ r B/ Δt, where N = 480, r = 0.075, E = and Δt = This yields B = 59 μt. 0. (Test Bank 14) A rectangular loop of wire (3 cm 4 cm) is placed inside a solenoid of radius 8 cm. The solenoid is 5 cm long and is wound with 1500 turns of wire carrying 4 A of current. The normal to the loop lies along the solenoid axis. If the current in the solenoid is reduced to zero in 0. sec., find the magnitude of the average induced emf in the loop. (1) mv () 36 μv (3) 1.8 μv (4) 0.5 mv (5) 80 μv The B field strength of a solenoid is B = μ0in, where n = 1500 / 0.5 = The emf in the loop can then be determined from E = Aμ0 nδi/ Δt, where A = = 0.001, Δi = 4 and Δt = 0.. Solving for the emf yields E = 0.18 mv. 7
1 of 7 10/1/2012 3:17 PM
Assignment Previewer http://www.webassign.net/v4cgijfederici@njit/control.pl 1 of 7 10/1/2012 3:17 PM HW11Faraday (2861550) Question 1 2 3 4 5 6 7 8 9 10 1. Question Details SerPSE8 31.P.011.WI. [1742725]
More information(b) Draw the direction of for the (b) Draw the the direction of for the
2. An electric dipole consists of 2A. A magnetic dipole consists of a positive charge +Q at one end of a bar magnet with a north pole at one an insulating rod of length d and a end and a south pole at
More informationPhysics 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
More informationMagnetic Forces and Magnetic Fields
1 Magnets Magnets are metallic objects, mostly made out of iron, which attract other iron containing objects (nails) etc. Magnets orient themselves in roughly a north  south direction if they are allowed
More informationHMWK 3. Ch 23: P 17, 23, 26, 34, 52, 58, 59, 62, 64, 73 Ch 24: Q 17, 34; P 5, 17, 34, 42, 51, 52, 53, 57. Chapter 23
HMWK 3 Ch 23: P 7, 23, 26, 34, 52, 58, 59, 62, 64, 73 Ch 24: Q 7, 34; P 5, 7, 34, 42, 5, 52, 53, 57 Chapter 23 P23.7. Prepare: The connecting wires are ideal with zero resistance. We have to reduce the
More informationPhysics 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
More informationTIME OF COMPLETION DEPARTMENT OF NATURAL SCIENCES. PHYS 2212, Exam 2 Section 1 Version 1 April 16, 2014 Total Weight: 100 points
TIME OF COMPLETION NAME DEPARTMENT OF NATURAL SCIENCES PHYS 2212, Exam 2 Section 1 Version 1 April 16, 2014 Total Weight: 100 points 1. Check your examination for completeness prior to starting. There
More information) 0.7 =1.58 10 2 N m.
Exam 2 Solutions Prof. Paul Avery Prof. Andrey Korytov Oct. 29, 2014 1. A loop of wire carrying a current of 2.0 A is in the shape of a right triangle with two equal sides, each with length L = 15 cm as
More informationMagnetism Conceptual Questions. Name: Class: Date:
Name: Class: Date: Magnetism 22.1 Conceptual Questions 1) A proton, moving north, enters a magnetic field. Because of this field, the proton curves downward. We may conclude that the magnetic field must
More informationPhys 102 Spg Exam No. 2 Solutions
Phys 102 Spg. 2008 Exam No. 2 Solutions I. (20 pts) A 10turn wire loop measuring 8.0 cm by 16.0 cm carrying a current of 2.0 A lies in the horizontal plane and is free to rotate about a horizontal axis
More informationPHYS 155: Final Tutorial
Final Tutorial Saskatoon Engineering Students Society eric.peach@usask.ca April 13, 2015 Overview 1 2 3 4 5 6 7 Tutorial Slides These slides have been posted: sess.usask.ca homepage.usask.ca/esp991/ Section
More informationThe Big Idea. Key Concepts
The ig Idea For static electric charges, the electromagnetic force is manifested by the Coulomb electric force alone. If charges are moing, howeer, there is created an additional force, called magnetism.
More informationmv = ev ebr Application: circular motion of moving ions In a uniform magnetic field: The mass spectrometer KE=PE magnitude of electron charge
1.4 The Mass Spectrometer Application: circular motion of moving ions In a uniform magnetic field: The mass spectrometer mv r qb mv eb magnitude of electron charge 1 mv ev KEPE v 1 mv ebr m v e r m B m
More informationPhys222 Winter 2012 Quiz 4 Chapters 2931. 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
More information4/16/ Bertrand
Physics B AP Review: Electricity and Magnetism Name: Charge (Q or q, unit: Coulomb) Comes in + and The proton has a charge of e. The electron has a charge of e. e = 1.602 1019 Coulombs. Charge distribution
More informationMagnetism. 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.
More informationTest  A2 Physics. Primary focus Magnetic Fields  Secondary focus electric fields (including circular motion and SHM elements)
Test  A2 Physics Primary focus Magnetic Fields  Secondary focus electric fields (including circular motion and SHM elements) Time allocation 40 minutes These questions were ALL taken from the June 2010
More informationNAME. and 2I o. (1) Two long wires carry magnetic fields I o. , where I o
(1) Two long wires carry magnetic fields I o and 2I o, where I o is a constant. The two wires cross at the origin (but without making any electrical connection), and lie in the xy plane. (a) Find the
More informationPHY2049 Exam #2 Solutions Fall 2012
PHY2049 Exam #2 Solutions Fall 2012 1. The diagrams show three circuits consisting of concentric circular arcs (either half or quarter circles of radii r, 2r, and 3r) and radial segments. The circuits
More informationMULTIPLE 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.
More informationPH2025D Final Comprehensive Exam (August 10, 2007)
NAME SCORE PH2025D Final Comprehensive Exam (August 0, 2007) You may not open the textbook nor notebook. A letter size information may be used. A calculator may be used. However, mathematics or physics
More informationPhysics 112 Homework 5 (solutions) (2004 Fall) Solutions to Homework Questions 5
Solutions to Homework Questions 5 Chapt19, Problem2: (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
More informationSolution: (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
More information2. B The magnetic properties of a material depend on its. A) shape B) atomic structure C) position D) magnetic poles
ame: Magnetic Properties 1. B What happens if you break a magnet in half? A) One half will have a north pole only and one half will have a south pole only. B) Each half will be a new magnet, with both
More informationReview 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.
More informationProfs. 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
More informationPearson Physics Level 30 Unit VI Forces and Fields: Chapter 12 Solutions
Concept Check (top) Pearson Physics Level 30 Unit VI Forces and Fields: Chapter 1 Solutions Student Book page 583 Concept Check (bottom) The northseeking needle of a compass is attracted to what is called
More informationPHYSICS 212 INDUCED VOLTAGES AND INDUCTANCE WORKBOOK ANSWERS
PHYSICS 212 CHAPTER 20 INDUCED VOLTAGES AND INDUCTANCE WORKOOK ANSWERS STUDENT S FULL NAME (y placing your name above and submitting this for credit you are affirming this to be predominantly your own
More informationConceptual: 1, 3, 5, 6, 8, 16, 18, 19. Problems: 4, 6, 8, 11, 16, 20, 23, 27, 34, 41, 45, 56, 60, 65. Conceptual Questions
Conceptual: 1, 3, 5, 6, 8, 16, 18, 19 Problems: 4, 6, 8, 11, 16, 20, 23, 27, 34, 41, 45, 56, 60, 65 Conceptual Questions 1. The magnetic field cannot be described as the magnetic force per unit charge
More informationLecture PowerPoints. Chapter 20 Physics: Principles with Applications, 7 th edition Giancoli
Lecture PowerPoints Chapter 20 Physics: Principles with Applications, 7 th edition Giancoli This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching
More informationMagnetic Fields; Sources of Magnetic Field
This test covers magnetic fields, magnetic forces on charged particles and currentcarrying wires, the Hall effect, the BiotSavart Law, Ampère s Law, and the magnetic fields of currentcarrying loops
More informationSample Exam #3 Electricity Physics 103 Spring 2011
Sample Exam #3 Electricity Physics 103 Spring 2011 1. An electric heater is constructed by applying a potential difference of 110 V across a wire with a resistance of 5.0 Ω. What is the power rating of
More information1) 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
More informationMASSACHUSETTS INSTINUTE OF TECHNOLOGY ESG Physics. Problem Set 9 Solution
MASSACHUSETTS INSTINUTE OF TECHNOLOGY ESG Physics 8. with Kai Spring 3 Problem 1: 37 and 8 Problem Set 9 Solution A conductor consists of a circular loop of radius R =.1 m and two straight, long sections,
More information45. The peak value of an alternating current in a 1500W device is 5.4 A. What is the rms voltage across?
PHYS Practice Problems hapters 8 hapter 8. 45. The peak value of an alternating current in a 5W device is 5.4 A. What is the rms voltage across? The power and current can be used to find the peak voltage,
More informationMOVING CHARGES AND MAGNETISM
MOVING CHARGES AND MAGNETISM 1. A circular Coil of 50 turns and radius 0.2m carries of current of 12A Find (a). magnetic field at the centre of the coil and (b) magnetic moment associated with it. 3 scores
More information2015 Pearson Education, Inc. Section 24.5 Magnetic Fields Exert Forces on Moving Charges
Section 24.5 Magnetic Fields Exert Forces on Moving Charges Magnetic Fields Sources of Magnetic Fields You already know that a moving charge is the creator of a magnetic field. Effects of Magnetic Fields
More informationPhysics 122 (Sonnenfeld), Spring 2013 ( MPSONNENFELDS2013 ) My Courses Course Settings
Signed in as Richard Sonnenfeld, Instructor Help Sign Out Physics 122 (Sonnenfeld), Spring 2013 ( MPSONNENFELDS2013 ) My Courses Course Settings Course Home Assignments Roster Gradebook Item Library Essential
More informationFaraday s Law; Inductance
This test covers Faraday s Law of induction, motional emf, Lenz s law, induced emf and electric fields, eddy currents, selfinductance, inductance, RL circuits, and energy in a magnetic field, with some
More informationPhysics 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.
More informationPhysics 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
More informationChapter 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
More information** Can skip to Problems: 6, 7, 9, 15, 19, 28, 29, 35, 36, 39, 42 **
Walker, Physics, 3 rd Edition Chapter 22 ** Can skip to Problems: 6, 7, 9, 15, 19, 28, 29, 35, 36, 39, 42 ** Conceptual Questions (Answers to oddnumbered Conceptual Questions can be found in the back
More informationGeneral Physics (PHY 2140)
General Physics (PHY 2140) Lecture 12 Electricity and Magnetism Magnetism Magnetic fields and force Application of magnetic forces http://www.physics.wayne.edu/~apetrov/phy2140/ Chapter 19 1 Department
More informationLast Name: First Name: Physics 102 Spring 2006: Exam #2 MultipleChoice Questions 1. A charged particle, q, is moving with speed v perpendicular to a uniform magnetic field. A second identical charged
More informationPhysics 6C, Summer 2006 Homework 1 Solutions F 4
Physics 6C, Summer 006 Homework 1 Solutions All problems are from the nd edition of Walker. Numerical values are different for each student. Chapter Conceptual Questions 18. Consider the four wires shown
More informationObjectives for the standardized exam
III. ELECTRICITY AND MAGNETISM A. Electrostatics 1. Charge and Coulomb s Law a) Students should understand the concept of electric charge, so they can: (1) Describe the types of charge and the attraction
More informationInduction. d. is biggest when the motor turns fastest.
Induction 1. A uniform 4.5T magnetic field passes perpendicularly through the plane of a wire loop 0.10 m 2 in area. What flux passes through the loop? a. 5.0 T m 2 c. 0.25 T m 2 b. 0.45 T m 2 d. 0.135
More informationChapter 14 Magnets and Electromagnetism
Chapter 14 Magnets and Electromagnetism Magnets and Electromagnetism In the 19 th century experiments were done that showed that magnetic and electric effects were just different aspect of one fundamental
More informationSolution Derivations for Capa #10
Solution Derivations for Capa #10 1) A 1000turn loop (radius = 0.038 m) of wire is connected to a (25 Ω) resistor as shown in the figure. A magnetic field is directed perpendicular to the plane of the
More informationChapter 14: Magnets and Electromagnetism
Chapter 14: Magnets and Electromagnetism 1. Electrons flow around a circular wire loop in a horizontal plane, in a direction that is clockwise when viewed from above. This causes a magnetic field. Inside
More informationVIII. Magnetic Fields  Worked Examples
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.0 Spring 003 VIII. Magnetic Fields  Worked Examples Example : Rolling rod A rod with a mass m and a radius R is mounted on two parallel rails
More information1. 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
More information104 Practice Exam 23/21/02
104 Practice Exam 23/21/02 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 nonzero
More information1. 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
More informationFaraday s Law of Induction
Faraday s Law of Induction Potential drop along the closed contour is minus the rate of change of magnetic flu. We can change the magnetic flu in several ways including changing the magnitude of the magnetic
More informationDirection of Induced Current
Direction of Induced Current Bar magnet moves through coil Current induced in coil A S N v Reverse pole Induced current changes sign B N S v v Coil moves past fixed bar magnet Current induced in coil as
More information2. The sum of the emf s and potential differences around a closed loop equals zero is a consequence
Chapter 27: CIRCUITS 1 The sum of the currents into a junction equals the sum of the currents out of the junction is a consequence of: A Newton s third law B Ohm s law C Newton s second law D conservation
More informationHomework #8 20311721 Physics 2 for Students of Mechanical Engineering. Part A
Homework #8 20311721 Physics 2 for Students of Mechanical Engineering Part A 1. Four particles follow the paths shown in Fig. 3233 below as they pass through the magnetic field there. What can one conclude
More information2. In Newton s universal law of gravitation the masses are assumed to be. B. masses of planets. D. spherical masses.
Practice Test: 41 marks (55 minutes) Additional Problem: 19 marks (7 minutes) 1. A spherical planet of uniform density has three times the mass of the Earth and twice the average radius. The magnitude
More informationFall 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
More informationObjectives. Capacitors 262 CHAPTER 5 ENERGY
Objectives Describe a capacitor. Explain how a capacitor stores energy. Define capacitance. Calculate the electrical energy stored in a capacitor. Describe an inductor. Explain how an inductor stores energy.
More informationForce 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
More informationPhysics 12 Study Guide: Electromagnetism Magnetic Forces & Induction. Text References. 5 th Ed. Giancolli Pg
Objectives: Text References 5 th Ed. Giancolli Pg. 58896 ELECTROMAGNETISM MAGNETIC FORCE AND FIELDS state the rules of magnetic interaction determine the direction of magnetic field lines use the right
More information(Answers to oddnumbered Conceptual Questions can be found in the back of the book, beginning on page ANSxxx.)
[go to Problems] Walker, Physics, 3 rd Edition Chapter 23 Conceptual Questions (Answers to oddnumbered Conceptual Questions can be found in the back of the book, beginning on page ANSxxx.) 1. Explain
More informationQuestion 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
More informationChapter 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?
More informationPHYS202 SPRING Lecture notes Electric Circuits. Batteries. A battery is a device that provides a potential difference to two terminals.
PHYS0 SPING 009 Lecture notes Electric Circuits Batteries A battery is a device that provides a potential difference to two terminals. Different metals in an electrolyte will create a potential difference,
More informationChapter 19 Magnetism Magnets Poles of a magnet are the ends where objects are most strongly attracted Two poles, called north and south Like poles
Chapter 19 Magnetism Magnets Poles of a magnet are the ends where objects are most strongly attracted Two poles, called north and south Like poles repel each other and unlike poles attract each other Similar
More informationYour Comments. I got so confused with Faraday's Law and Lenz's Law... AREN'T THESE TWO LAWS SUPPOSED TO MEAN THE SAME THING???
Your Comments There were some parts of this prelecture I grasped well while other parts like the generator and the loops I still have trouble with. Can you please clarify how Faraday's and Lenz's law are
More informationHomework #11 20311721 Physics 2 for Students of Mechanical Engineering
Homework #11 20311721 Physics 2 for Students of Mechanical Engineering 2. A circular coil has a 10.3 cm radius and consists of 34 closely wound turns of wire. An externally produced magnetic field of
More informationSolution Derivations for Capa #11
Solution Derivations for Capa #11 Caution: The symbol E is used interchangeably for energy and EMF. 1) DATA: V b = 5.0 V, = 155 Ω, L = 8.400 10 2 H. In the diagram above, what is the voltage across the
More informationHandout 7: Magnetic force. Magnetic force on moving charge
1 Handout 7: Magnetic force Magnetic force on moving charge A particle of charge q moving at velocity v in magnetic field B experiences a magnetic force F = qv B. The direction of the magnetic force is
More informationMFF 3a: Charged Particle and a Straight CurrentCarrying Wire... 2
MFF 3a: Charged Particle and a Straight CurrentCarrying Wire... 2 MFF3a RT1: Charged Particle and a Straight CurrentCarrying Wire... 3 MFF3a RT2: Charged Particle and a Straight CurrentCarrying Wire...
More informationMultiple 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
More information1. If each of the four resistors below has a resistance of 1 µω, what is the equivalent resistance of the combination?
1. If each of the four resistors below has a resistance of 1 µω, what is the equivalent resistance of the combination? V (a) 0.25 µω (b) 1 µω (c) 2 µω (d) 4 µω (e) none of these 2. Three identical lamps
More informationChapter 24 Practice Problems, Review, and Assessment
Section 1 Understanding Magnetism: Practice Problems 1. If you hold a bar magnet in each hand and bring your hands close together, will the force be attractive or repulsive if the magnets are held in the
More informationInduced voltages and Inductance Faraday s Law
Induced voltages and Inductance Faraday s Law concept #1, 4, 5, 8, 13 Problem # 1, 3, 4, 5, 6, 9, 10, 13, 15, 24, 23, 25, 31, 32a, 34, 37, 41, 43, 51, 61 Last chapter we saw that a current produces a magnetic
More informationCandidate 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
More informationMagnetic Fields ild and Forces
Magnetic Fields ild and Forces Physics 1 Facts about Magnetism Magnets have 2 poles (north and south) Like poles repel Unlike poles attract Magnets create a MAGNETIC FIELD around them Magnetic Field A
More informationTHE MAGNETIC FIELD. 9. Magnetism 1
THE MAGNETIC FIELD Magnets always have two poles: north and south Opposite poles attract, like poles repel If a bar magnet is suspended from a string so that it is free to rotate in the horizontal plane,
More informationLevel 2 Physics: Demonstrate understanding of electricity and electromagnetism
Level 2 Physics: Demonstrate understanding of electricity and electromagnetism Static Electricity: Uniform electric field, electric field strength, force on a charge in an electric field, electric potential
More informationCalculate the centripetal acceleration of the boot just before impact
(ii) alculate the centripetal acceleration of the boot just before impact....... (iii) iscuss briefly the radial force on the knee joint before impact and during the impact................. (4) (Total
More informationHow many laws are named after Kirchhoff?
Chapter 32. Fundamentals of Circuits Surprising as it may seem, the power of a computer is achieved simply by the controlled flow of charges through tiny wires and circuit elements. Chapter Goal: To understand
More information5 Magnets and electromagnetism
Magnetism 5 Magnets and electromagnetism n our modern everyday life, the phenomenon of magnetism is associated with iron that is attracted by permanent magnets that can also be made of iron compounds.
More informationPHYSICS 102 EXAM #2  MULTIPLE CHOICE Name Choose the one alternative that best completes the statement or answers the question. March 31, 2005 1) The figure below shows 3 identical lightbulbs connected
More information= (0.400 A) (4.80 V) = 1.92 W = (0.400 A) (7.20 V) = 2.88 W
Physics 2220 Module 06 Homework 0. What are the magnitude and direction of the current in the 8 Ω resister in the figure? Assume the current is moving clockwise. Then use Kirchhoff's second rule: 3.00
More informationMagnetic Field Lines. Uniform Magnetic Field. Earth s Magnetic Field 6/3/2013
Chapter 33: Magnetism Ferromagnetism Iron, cobalt, gadolinium strongly magnetic Can cut a magnet to produce more magnets (no magnetic monopole) Electric fields can magnetize nonmagnetic metals Heat and
More informationPhysics 2220 Module 09 Homework
Physics 2220 Module 09 Homework 01. A potential difference of 0.050 V is developed across the 10cmlong wire of the figure as it moves though a magnetic field perpendicular to the page. What are the strength
More informationPHYS 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
More information1 of 7 4/13/2010 8:05 PM
Chapter 33 Homework Due: 8:00am on Wednesday, April 7, 2010 Note: To understand how points are awarded, read your instructor's Grading Policy [Return to Standard Assignment View] Canceling a Magnetic Field
More informationPhysics 202 Spring 2010 Practice Questions for Chapters 2124
Note: Answer key is at end. Physics 202 Spring 2010 Practice Questions for Chapters 2124 1. A uniformly positively charged spherical conductor is placed midway between two identical uncharged conducting
More informationPH 102 Exam II SOLUTION
PH 102 Exam II SOLUTION 20Mar07 LeClair INSTRUCTIONS 1. Solve 8 problems out of the 12 below. All problems have equal weight. 2. Clearly mark the problems you choose by filling in the adjacent circle.
More informationEðlisfræði 2, vor 2007
[ Assignment View ] [ Pri Eðlisfræði 2, vor 2007 29a. Electromagnetic Induction Assignment is due at 2:00am on Wednesday, March 7, 2007 Credit for problems submitted late will decrease to 0% after the
More information5.Magnetic Fields due to Currents( with Answers)
5.Magnetic Fields due to Currents( with Answers) 1. Suitable units for µ. Ans: TmA 1 ( Recall magnetic field inside a solenoid is B= µ ni. B is in tesla, n in number of turn per metre, I is current in
More informationChapter 18 Electric Current and Circuits
Chapter 18 Electric Current and Circuits 3. When a current flows down a wire: A. electrons are moving in the direction of the current. B. electrons are moving opposite the direction of the current. C.
More informationCopyright 2014 Edmentum  All rights reserved.
Copyright 2014 Edmentum  All rights reserved. Science Physics Electromagnetic Blizzard Bag 20142015 1. Two coils of insulated wire are placed side by side, as shown in the illustration. The blue lines
More informationPhysics 104 Exam 2 Name
1. An electron moves with a velocity of 7.0 x 10 6 m/s due west in a uniform magnetic field of magnitude 4.0 T at an angle of 30 ast of orth. At the same point an electric field of magnitude 9.0 x 10 6
More informationMagnetic Forces cont.
Magnetic Fields Magnetism Magnets can exert forces on each other. The magnetic forces between north and south poles have the property that like poles repel each other, and unlike poles attract. This behavior
More informationChapter 27 Magnetic Induction. Copyright 2008 Pearson Education Inc., publishing as Pearson AddisonWesley
Chapter 27 Magnetic Induction Motional EMF Consider a conductor in a Bfield moving to the right. In which direction will an electron in the bar experience a magnetic force? V e  V The electrons in the
More information