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An electric dipole of dipole moment vecP...

An electric dipole of dipole moment `vecP` is placed in a uniform electric field `vecE` such that `vecP` is perpendicular to `vecE` . The work done to turn the dipole through an angle of `180^(@)` is -

Text Solution

Verified by Experts

Take `DeltaU=0`, when `phi=pi//2`
`W=DeltaU=U_(2)-U_(1)`
Now `U_(2)=-(Epcospi)=Ep`
`U_(1)=-(Epcos0)`
`=-Ep`
`therefore W=2Ep`
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