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

Options

A. electric field must be present.
B. magnetic field must be present.
C. electric field may be present.
D. both electric and magnetic field must be present.

Answer

a

Explanation

Magnetic field may or may not be present because it cannot apply force on a charge at rest. If the charged particle at rest is experiencing some electromagnetic force, then it must be electric. Thus, option (a) is correct.