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

Solution

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

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