Q:The self potential energy of hydrogen chloride whose dipole moment is 3.44× 10-30 C–m and separation between hydrogen and chlorine atoms is 1.01 × 10-10 m is
(a) 1.036 × 10-19 J
(b) 3.2 × 105 J
(c) 4.5 × 107 J
(d) 1.65 × 106 J
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Ans: (a)
Sol: Dipole moment p = q × l
$ \displaystyle q = \frac{p}{l} $
P.E , $ \displaystyle U = \frac{q^2}{4\pi \epsilon_0 l}$