The electromagnetic force is acting on the charge particle.

Formula used: 1. Electric force is given by

Where F is electric force

q is electric charge

E is electric field

From the above formula we can say that electric field should not be zero. Because electric force is acting on the particle. And the particle is rest, so velocity of the charged particle is zero.

2. The magnetic force is given by

Where F is magnetic force

q is electric charge =

v is velocity

B is magnetic filed

is angle between magnetic field and charge

From the above equation we can say that magnetic fore will become zero. But we don’t know whether the magnetic filed is zero or not. We cannot make the statement about magnetic field. So magnetic field may or may not be zero. Option A and D are correct.