The dipole moment of dipole is given as:

\(left | underset{p}{rightarrow} right |\) = q(2a)

Force on -q at A = -qE

Force on +q at B = +qE

Therefore, the net force is = qE-qE = 0

Work done on dipole is given as:

W=ΔU=PE(cosθ1 – cosθ2) = PE(cos 0°-cos 180°) = 2PE

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