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Question

An electric dipole of moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. If it is rotated through an angle θ from the initial position, the potential energy of electric dipole in the final position is

A
pE cosθ
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B
pE sinθ
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C
pE(1cosθ)
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D
pE cosθ
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Solution

The correct option is D pE cosθ
Potential energy of dipole in electric field is U=pE cosθ; where θ is the angle between electric field and dipole moment vector.

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