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Q. A sample of $HCl$ gas is placed in an electric field of $3 \times 10^{4} \,NC ^{-1}$. The dipole moment of each $HCl$ molecule is $6 \times 10^{-30} \,Cm$. The maximum torque that can act on a molecule is

VITEEEVITEEE 2008

Solution:

Torque, $ \tau =p \times E $
$ \tau_{\max } =p E $
$=6 \times 10^{-30} \times 3 \times 10^{4} $
$=18 \times 10^{-26} \,Nm $