An electric dipole of dipole moment P is placed parallel to a uniform electric field of magnitude E. The amount of work done in slowly rotating the dipole by 60∘ will be
[0.77 Mark]
A
2PE
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B
PE
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C
PE4
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D
PE2
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Solution
The correct option is DPE2 As we know that, U=−→P.→E W=ΔU=−PEcosθ2−(−PEcosθ1) =PE(cosθ1−cosθ2) =PE(cos0∘−cos60∘) =PE2