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  4. An electric dipole placed in a uniform electric field will have minimum potential energy when the dipole moment is inclined to the field at an angle

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Q. An electric dipole placed in a uniform electric field will have minimum potential energy when the dipole moment is inclined to the field at an angle

Uttarkhand PMTUttarkhand PMT 2010

Solution:

Since, $ U=-\vec{p}\vec{E} $
$ \Rightarrow $ $ U=-pE\cos \theta $
So, $U$ is minimum when, $ \theta =0^{\circ} $