An electron is moving north in a region where the magnetic field is south. The magnetic force exerted on the electron is:
A) zero
B) up
C) down
D) east
E) west

Question

Quizplus · Accepted Answer

The magnetic force on a moving electron is given by the Lorentz force equation: F = q(v x B), where q is the charge of the electron, v is its velocity, and B is the magnetic field. In this case, the electron is moving north and the magnetic field is south, so the cross product of v and B will be in the east direction. Therefore, the magnetic force on the electron will be in the west direction, which is choice A.

An Electron Is Moving North in a Region Where the Magnetic