$U = - pE\,\cos \,\theta $
Torque experienced by dipole
$\tau = pE\,\sin \,\theta $
Torque will be maximum $({\tau _{\max }})$ when $\theta = {90^o}$
then potential energy $U = 0$
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Assertion $(A)$ and the other is labelled as Reason$(R)$
$Assertion$ $(A)$ : Work done by electric field on moving a positive charge on an equipotential surface is always zero.
$Reason$ $(R)$ : Electric lines of forces are always perpendicular to equipotential surfaces.
In the light of the above statements, choose the most appropriate answer from the options given below
