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Deduce the expression for the torque acting on it. In a particular situation, it has dipole moment aligned with the electric field. Is the equilibrium stable or unstable?

1 Answer

$U=-pE \cos 0$
$\quad= -pE$
$\quad= U_{\min}$
Hence B is the correct answer.
answered Jun 3, 2014 by meena.p

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