Q. In which of the states shown in figure is the potential energy of a electric dipole maximum?
A) [image:2_image13.emf]
B) [image:2_image14.emf]
C) [image:2_image15.emf]
D) [image:2_image16.emf]
Explanation
(a) Potential energy of electric dipole, $U = - \overrightarrow{p}$ $.\ \overrightarrow{E}\ $=$\ - pE\cos\theta$.
In Fig. (a), $\theta = \pi$ rad hence $\ U = - pE\cos\pi = + pE = maximum.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.