Q. An electric dipole when placed in a uniform electric field $E$ will have minimum potential energy, if the positive direction of dipole moment makes the following angle with $E$
A) $\pi$
B) $\pi/2$
C) Zero
D) $3\pi/2$
Explanation
(c) Potential energy $= - pE\cos\theta$
When $\theta = 0.$ Potential energy $= - pE$ (minimum)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.