Q. An electric dipole of moment $p$ is placed in the position of stable equilibrium in uniform electric field of intensity $E.$ It is rotated through an angle $\theta$ from the initial position. The potential energy of electric dipole in the final position is
A) $pE\cos\theta$
B) $pE\sin\theta$
C) $pE(1 - \cos\theta)$
D) $- pE\cos\theta$
Explanation
(d) Potential energy of dipole in electric field $U = - PE\cos\theta;$ where $\theta$ is the angle between electric field and dipole
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.