Q. An electric dipole consisting of two opposite charges of $2 \times 10^{- 6}C$ each separated by a distance of $3\ cm$ is placed in an electric field of $2 \times 10^{5}\ N/C.$ The maximum torque on the dipole will be
A) $12 \times 10^{- 1}\ Nm$
B) $12 \times 10^{- 3}\ Nm$
C) $24 \times 10^{- 1}\ Nm$
D) $24 \times 10^{- 3}\ Nm$
Explanation
(b) Maximum torque $= pE$
$= 2 \times 10^{- 6} \times 3 \times 10^{- 2} \times 2 \times 10^{5} = 12 \times 10^{- 3}N - m$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.