Question
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 $E$
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Answer
(c) Potential energy $=$ $-pE\, cos\theta$
When $\theta$ $= 0$. Potential energy $=$ $-\,pE$ (minimum)
When $\theta$ $= 0$. Potential energy $=$ $-\,pE$ (minimum)
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