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Q. An electric dipole has the magnitude of its charge as $q$ and dipole moment as $p$. It is placed in a uniform electric field $E$. If its dipole moment is along the direction of the field. the force on it and its potential energy are respectively

Electrostatic Potential and Capacitance

Solution:

In the given condition angle between $\vec{p}$ and $\vec{E}$ is zero.
Hence potential energy $U=-p E \cos 0=-p E=\min$.
Also in uniform electric field $F_{\text {net }}=0$.