Question

A dipole is placed in a uniform electric field with its axis parallel to the field. It experiences :

• A. both a net force and torque
• B. only a net force
• C. neither a net force nor a torque
• D. only a torque

Answer 1

The correct option is C neither a net force nor a torque

Since dipole is placed in a uniform electric field, so it experiences zero external force.

Also, dipole is placed to parallel to electric field.

Angle between $P$ and $E$ is zero i.e. $\theta =0^o$

Torque $\tau =PE\sin \theta =PE\times \sin 0^o=0$