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
pEcosθ
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B
pEsinθ
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C
pE(1−cosθ)
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D
−pEcosθ
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Solution
The correct option is D−pEcosθ Potential energy of dipole in electric field is U=−pEcosθ; where θ is the angle between electric field and dipole moment vector.