When a magnetic field causes a charged particle to move in a circular path, the only quantity listed below which the magnetic force changes significantly as the particle goes around in a circle is the particle's:
A) energy.
B) time to go around the circle once.
C) momentum.
D) radius for the circle.

Question

Quizplus · Accepted Answer

The magnetic force changes the direction of the particle's velocity, thus changing its momentum, but not its speed or energy.

When a Magnetic Field Causes a Charged Particle to Move