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Question

A dipole of dipole moment $$p$$ is rotated by angle $$\pi$$ in a uniform electric field of strength $$E$$. The work required.


A
must be pE
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B
must be 2pE
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C
must be zero
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D
may be zero
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Solution

The correct option is C may be zero
work required = - change in potential energy$$ = -PE cos(\theta + \pi) - (-PE cos \theta) = 2PE cos \theta$$
depending on $$\theta $$ value of work required can be zero

Physics

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