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What is the work done in rotating an electric dipole in an external uniform electric field \vec{E} from 0° to 180°?

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What is the work done in rotating an electric dipole in an external uniform electric field \(\vec{E}\) from 0° to 180°?

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W = pE(cosθ1 – cosθ2)
θ1 = 0°, θ2 = 180°
W = pE( cosθ°-cos180°)
= pE [1 – (1)]
⇒ W = 2pE Joule

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