A proton with initial kinetic energy E is moving in circular motion in a uniform magnetic field.When it has completed one fourth of a revolution,what is its kinetic energy?
A) 1.4 E
B) 0.71 E
C) E
D) The value is not given.

Question

Quizplus · Accepted Answer

The kinetic energy of a charged particle moving in a uniform magnetic field remains constant because the magnetic force does no work on the particle. Thus, after one fourth of a revolution, the kinetic energy of the proton is still E.

A Proton with Initial Kinetic Energy E Is Moving in Circular