Question

An electric dipole placed with its axis in the direction of a uniform electric field experiences:

• A. a force but not torque
• B. a torque but no force
• C. a force as well as a torque
• D. neither a force nor a torque

Answer 1

The correct option is D neither a force nor a torque

Total force of on diopole $=Eq+E(-q)$ $=0$
We know,
Torque $=\overrightarrow{P}\times \overrightarrow{E}$
but axis of dipole is in the direction of electric field
$\therefore \tau =P.Esin0$
$\therefore \tau =0$
$\therefore$ No torque, No force is acting on dipole