If a charged particle kept at rest experiences an electromagnetic force,

Options

A. Electric field must be zero
B. Electric field may or may not be zero
C. Magnetic field must be zero
D. Magnetic field may or may not be zero

Answer

a, d

Explanation

The electric field can apply force on charge in a state of rest or motion, but the magnetic field cannot apply force on charge at rest. Hence options (a) and (d) are correct.