Two electrons are moving in a uniform magnetic field. The velocity of the first electron is twice the velocity of the second electron. The electron that has the larger circular radius is
A) the first electron.
B) the second electron.
C) Both trajectories have the same radius.
D) The paths of these electrons are not circular.

Question

Quizplus · Accepted Answer

The radius of the circular path of a charged particle moving in a magnetic field is directly proportional to its velocity. Since the first electron has twice the velocity of the second, its circular path will have a larger radius.

Two Electrons Are Moving in a Uniform Magnetic Field