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# Electron at Rest in Electric and Magnetic Fields

EANDM-HQZHYO

An electron sits at rest in a region of space. You observe that it does not move over a long time period.

Which statement best describes what you can conclude about the magnetic and electric fields at this position?

A

The electric and magnetic fields are parallel and the field magnitudes are such that the electric force exactly cancels the magnetic force.

B

The electric and magnetic fields are perpendicular and the field magnitudes are such that the electric force exactly cancels the magnetic force.

C

The electric field and the magnetic field must be zero.

D

The electric field must be zero, but the magnetic field could be any constant value.

E

The magnetic field must be zero, but the electric field could be any constant value.