Question

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. $- pE\cos\theta$

Answer 1

Answer: (D)

$- pE\cos\theta$

Answer 2

Potential energy of dipole in electric field $U = - PE\cos\theta$; where θ is the angle between electric field and dipole.