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An electric dipole when placed in a uniform electric field $\boldsymbol{E}$ will have minimum potential energy, if the positive direction of dipole moment makes the following angle with $\boldsymbol{E}$
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Potential energy $=-p E \cos \theta$
When $\theta=0$. Potential energy $=-p E$ (minimum)
When $\theta=0$. Potential energy $=-p E$ (minimum)
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