1.27) In a certain region of space, electric field is along the z-direction throughout. The magnitude of electric field is, however, not constant but increases uniformly along the positive z-direction, at the rate of per metre. What are the force and torque experienced by a system having a total dipole moment equal to Cm in the negative z-direction ?
Force on a charge F=qE
but here E is varying along the Z direction.
Force can be written as,
Torque experienced =0 since both dipole and electric field are in the Z direction. The angle between dipole and the electric field is 180 degrees