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An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90° is
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- pE2
- p2E
- pE
- infinity
Correct Option: C
When electric dipole is aligned parallel θ = 0° and the dipole is rotated by 90° i.e., θ = 90°.
Energy required to rotate the dipole W = Uf – Ui = (–pE cos 90°) – (–pE cos 0°)
= pE.
