An electron,moving toward the west,enters a uniform magnetic field.Because of this field the electron curves upward.The direction of the magnetic field is
A) towards the north.
B) towards the south.
C) towards the west.
D) upward.
E) downward.

Question

Quizplus · Accepted Answer

When an electron moves towards the west, and curves upward in a magnetic field, it means that the magnetic force is acting perpendicular to both the direction of motion (i.e., towards the west) and the direction of upward motion. By applying the right-hand rule, the direction of the magnetic field can be determined. If the thumb of the right hand points in the direction of the upward motion of the electron, and the fingers represent the direction of the magnetic force, then the palm will point towards the north. Therefore, the direction of the magnetic field is towards the north.

An Electron,moving Toward the West,enters a Uniform Magnetic Field