An electric dipole of moment p→ is placed normal to the lines of force of electric intensity E→, then the work done in deflecting it through an angle of 180° is

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+ 2 pE

−2 pE

Zero

answer is D.

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Detailed Solution

Work done =∫ 90 270pE sin θ dθ=[ − pE cos θ] 90 270=0

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