An electron, moving south, enters a magnetic field. Because of this field, the electron curves upward. We may conclude that the magnetic field must have a component
A) upward.
B) towards the north.
C) towards the east.
D) towards the west.
E) downward.

Question

Quizplus · Accepted Answer

The force on a charged particle moving in a magnetic field is given by the right-hand rule. Since the electron curves upward, the magnetic field must be towards the west to exert an upward force on a south-moving electron.

An Electron, Moving South, Enters a Magnetic Field