An electric dipole of dipole moment 5 × 10-6 Cm is placed in a uniform electric field of 10-2 N/C making an angle of 30° with the direction of the field. The torque exerted by the electric field on the dipole is:
Answer & explanation
Correct answer: option 3
Torque $ \tau = pE sin\theta = 5\times 10^{-6} \times 10^{-2} sin30^o = 2.5\times 10^{-8} N-m$