An electron moving in the positive y direction, at right angles to a magnetic field, experiences a magnetic force in the negative x direction. What is the direction of the magnetic field?
A) It is in the negative x direction.
B) It is in the positive x direction.
C) It is in the positive y direction.
D) It is in the negative z direction.
E) It is in the positive z direction.

Question

Quizplus · Accepted Answer

Using the right-hand rule for a negative charge like an electron, point your thumb in the direction of the electron's velocity (positive y direction), and your fingers in the direction of the magnetic force (negative x direction). Your palm will face the direction of the magnetic field, which is the positive z direction.

An Electron Moving in the Positive Y Direction, at Right