The respective radii of the two spheres of a spherical condenser are $12\;cm$ and $9\;cm$. The dielectric constant of the medium between them is $ 6$. The capacity of the condenser will be
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(a) $C = 4\pi {\varepsilon _0}K\,\left[ {\frac{{ab}}{{b - a}}} \right] = \frac{1}{{9 \times {{10}^9}}}.6\,\left[ {\frac{{12 \times 9 \times {{10}^{ - 4}}}}{{3 \times {{10}^{ - 2}}}}} \right]$
$ = 24 \times {10^{ - 11}} = 240\,pF$
$ = 24 \times {10^{ - 11}} = 240\,pF$
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