An electric dipole of dipole moment \(\rm\overrightarrow{p}\) is placed in an electric field \(\rm\overrightarrow{E}\). The torque, exerted by the field on the dipole, is
1
parallel to both the field and the dipole moment.
2
perpendicular to both the field and the dipole moment.
3
parallel to the 'field' and perpendicular to the dipole moment.
4
parallel to the dipole moment and perpendicular to the field.