A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field. If the proton's speed tripled, its time to go around its circular path would be

Question

Quizplus · Accepted Answer

The time to go around the circular path, or the period, of a charged particle in a uniform magnetic field is independent of its speed. This is because while the speed affects the radius of the circular path, the period is determined by the charge and mass of the particle and the strength of the magnetic field, none of which change when the speed changes.

A Proton, Moving in a Uniform Magnetic Field, Moves in a Circle