A particle with charge q and mass m is moving with speed v in the +x direction enters a magnetic field of strength B pointing in the +y direction. The work done by the magnetic force on the particle as it travels one semi-circle is A) $\pi$mqvB B) $\pi$mv² C) $\pi$qvB D) zero E) $\pi$mv/qB

Question

Quizplus · Accepted Answer

The magnetic force is always perpendicular to the velocity of the particle, so it does no work on the particle. Therefore, the work done by the magnetic force on the particle as it travels one semi-circle is zero.

A Particle with Charge Q and Mass M Is Moving π\piπ

A Particle with Charge Q and Mass M Is Moving $\pi$