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
AIPMT 1994, Medium
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(d) Potential energy of dipole in electric field $U = - PE\cos \theta $; where $\theta$ is the angle between electric field and dipole.
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