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NEET 2013 · Electric Dipole

Electric Dipole question from NEET 2013

Q71NEET 2013Easy

Electric Dipole

An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90o is

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Answer: (b)

  1. W=pE(cos⁡θ1−cos⁡θ2)W = pE(\cos\theta_1 - \cos\theta_2)
  2. W=pE(cos⁡0∘−cos⁡90∘)=pEW = pE(\cos 0^\circ - \cos 90^\circ) = pE
  3. So the answer is (b) pEpE.
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