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Physics Review Question Unit: Magnetism Year: 1996 Question#: 34 Question: A charged particle is moving with a constant velocity. On entering a uniform magnetic field, the particle (1 ) must decrease in speed (2 ) must change the magnitude of its momentum (3 ) may change its direction of motion (4 ) may increase in kinetic energy What is this question really asking? Explanation by: Dan M [ Return to question menu ] Answer 1 must decrease in speed INCORRECT it doesn't always decrease in speed return to top Answer 2 must change the magnitude of its momentum INCORRECT the magnitude of its momentum shouldn't change return to top Answer 3 may change its direction of motion CORRECT In most arrangements of the motion of a charge and the direction of the magnetic field there is a force created that changes the direction of motion of the charge. This arrangement is described by the third hand rule. return to top Answer 4 may increase in kinetic energy INCORRECT kinetic energy won't change due to this return to top What's this question really asking? what could happen to a charged particle as it crosses a magnetic field? return to top |
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