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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a
pE
b
+ 2 pE
c
−2 pE
d
Zero
answer is D.
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Detailed Solution
Work done =∫ 90 270pE sin θ dθ=[ − pE cos θ] 90 270=0