# Q27.1 When a charged particle moves near a bar magnet, the magnetic force on the particle at a certain point depends

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1 Q27.1 When a charged particle moves near a bar magnet, the magnetic force on the particle at a certain point depends A. on the direction of the magnetic field at that point only. B. on the magnetic field and the charge of the particle only. C. on the magnetic field, the charge of the particle and the velocity of the bar magnet only. D. on the magnetic field, the charge of the particle and the velocity of the charge only. E. none of the above

2 A27.1 When a charged particle moves near a bar magnet, the magnetic force on the particle at a certain point depends A. on the direction of the magnetic field at that point only. B. on the magnetic field and the charge of the particle only. C. on the magnetic field, the charge of the particle and the velocity of the bar magnet only. D. on the magnetic field, the charge of the particle and the velocity of the charge only. E. none of the above

3 Q27.2 A particle with a positive charge moves in the xz-plane as shown. The magnetic field is in the positive z-direction. The magnetic force on the particle is in A. the positive x-direction. B. the negative x-direction. C. the positive y-direction. D. the negative y-direction. E. none of these

4 A27.2 A particle with a positive charge moves in the xz-plane as shown. The magnetic field is in the positive z-direction. The magnetic force on the particle is in A. the positive x-direction. B. the negative x-direction. C. the positive y-direction. D. the negative y-direction. E. none of these

5 Q27.3 A particle with charge q = 1 C is moving in the positive z-direction at 5 m/s. The magnetic field at its position is r B= 3iˆ 4 ˆj T ( ) What is the magnetic force on the particle? A. B. C. D. ( iˆ+ ˆj) N ( iˆ ˆj) ( iˆ+ ˆj) ( iˆ ˆj) N N N E. none of these

6 A27.3 A particle with charge q = 1 C is moving in the positive z-direction at 5 m/s. The magnetic field at its position is r B= 3iˆ 4 ˆj T What is the magnetic force on the particle? A. B. C. D. ( ) ( iˆ+ ˆj) N ( iˆ ˆj) ( iˆ+ ˆj) ( iˆ ˆj) N N N E. none of these

7 Q27.4 A positively charged particle moves in the positive z-direction. The magnetic force on the particle is in the positive y-direction. What can you conclude about the y-component of the magnetic field at the particle s position? A. B y > 0 B. B y = 0 C. B y < 0 D. not enough information given to decide

8 A27.4 A positively charged particle moves in the positive z-direction. The magnetic force on the particle is in the positive y-direction. What can you conclude about the y-component of the magnetic field at the particle s position? A. B y > 0 B. B y = 0 C. B y < 0 D. not enough information given to decide

9 Q27.5 When a charged particle moves through a magnetic field, the trajectory of the particle at a given point is A. parallel to the magnetic field line that passes through that point. B. perpendicular to the magnetic field line that passes through that point. C. neither parallel nor perpendicular to the magnetic field line that passes through that point. D. any of the above, depending on circumstances

10 A27.5 When a charged particle moves through a magnetic field, the trajectory of the particle at a given point is A. parallel to the magnetic field line that passes through that point. B. perpendicular to the magnetic field line that passes through that point. C. neither parallel nor perpendicular to the magnetic field line that passes through that point. D. any of the above, depending on circumstances

11 Q27.6 In a velocity selector, the electric field and magnetic field A. must point in the same direction. B. must point in opposite directions. C. must point in perpendicular directions. D. The answer depends on the sign of the particle s electric charge.

12 A27.6 In a velocity selector, the electric field and magnetic field A. must point in the same direction. B. must point in opposite directions. C. must point in perpendicular directions. D. The answer depends on the sign of the particle s electric charge.

13 Q27.6 In a velocity selector, the chosen velocity (v) is related to the electric field (E) and magnetic field (B) by A. v=eb B. v=e/b C. v=b/e D. The answer depends on the sign of the particle s electric charge.

14 A27.7 In a velocity selector, the chosen velocity (v) is related to the electric field (E) and magnetic field (B) by A. v=eb B. v=e/b C. v=b/e D. The answer depends on the sign of the particle s electric charge.

15 Q27.8 In a mass spectrometer, a charge particle moves in a circular path in a region of magnetic field. The radius of the circular path is A. independent of the momentum of the charge particle B. linearly proportional to the momentum of the charge particle C. inversely protional to the momentum of the charge particle D. The answer depends on the sign of the particle s electric charge.

16 A27.8 In a mass spectrometer, a charge particle moves in a circular path in a region of magnetic field. The radius of the circular path is A. independent of the momentum of the charge particle B. linearly proportional to the momentum of the charge particle C. inversely protional to the momentum of the charge particle D. The answer depends on the sign of the particle s electric charge.

17 Q27.19 A circular loop of wire carries a constant current. If the loop is placed in a region of uniform magnetic field, the net magnetic force on the loop is A. perpendicular to the plane of the loop, in a direction given by a right-hand rule. B. perpendicular to the plane of the loop, in a direction given by a left-hand rule. C. in the same plane as the loop. D. zero. E. The answer depends on the magnitude and direction of the current and on the magnitude and direction of the magnetic field.

18 A27.9 A circular loop of wire carries a constant current. If the loop is placed in a region of uniform magnetic field, the net magnetic force on the loop is A. perpendicular to the plane of the loop, in a direction given by a right-hand rule. B. perpendicular to the plane of the loop, in a direction given by a left-hand rule. C. in the same plane as the loop. D. zero. E. The answer depends on the magnitude and direction of the current and on the magnitude and direction of the magnetic field.

19 Q27.10 A circular loop of wire carries a constant current. If the loop is placed in a region of uniform magnetic field, the net magnetic torque on the loop A. tends to orient the loop so that its plane is perpendicular to the direction of the magnetic field. B. tends to orient the loop so that its plane is edge-on to the direction of the magnetic field. C. tends to make the loop rotate around its axis. D. is zero. E. The answer depends on the magnitude and direction of the current and on the magnitude and direction of the magnetic field.

20 A27.10 A circular loop of wire carries a constant current. If the loop is placed in a region of uniform magnetic field, the net magnetic torque on the loop A. tends to orient the loop so that its plane is perpendicular to the direction of the magnetic field. B. tends to orient the loop so that its plane is edge-on to the direction of the magnetic field. C. tends to make the loop rotate around its axis. D. is zero. E. The answer depends on the magnitude and direction of the current and on the magnitude and direction of the magnetic field.

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