Dipole is placed parallel to the electric field. If W is the work done in rotating the dipole by 60°, then work done in rotating it by 180° from the initial position of parallel to electric field is:

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W/2

answer is C.

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Detailed Solution

$\begin{array}{l} W = pE (\cos 0^{\circ} - \cos 60^{\circ}) = pE (1 - \frac{1}{2}) = \frac{pE}{2} \\ W^{'} = pE (\cos 0^{\circ} - \cos 180^{\circ}) = pE (1 + 1) = 2 pE = 2 (2 w) = 4 w \end{array}$

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