An electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole is:
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An electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole is:

G1 Physics · Accepted Answer

Step 1: Torque τ = pE sinθ; rotation work ∫τdθ = pE(cosθᵢ − cosθ𝒻). Step 2: For rotation from 0° to 90°, W = pE(1 − 0) = pE.