Q.

An electric dipole of moment P is placed in the position of stable equilibrium in uniform electric field of intensity E. It is rotated through an angle θ from the intial position. The potential energy of electric dipole in the position is

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a

pEcosθ

b

pEsinθ

c

pE(1cosθ)

d

pEcosθ

answer is D.

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Detailed Solution

U=PEcosθ 

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An electric dipole of moment P is placed in the position of stable equilibrium in uniform electric field of intensity E. It is rotated through an angle θ from the intial position. The potential energy of electric dipole in the position is