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# A spherical capacitor has an inner sphere of radius $12\;cm$ and an outer sphere of radius $13\;cm$. The outer sphere is earthed and the inner sphere is given a charge of $2.5\;\mu C$. The space between the concentric spheres is filled with a liquid of dielectric constant $32$. Compare the capacitance of this capacitor with that of an isolated sphere of radius $12\;cm$. Explain why the latter is much smaller.

$(D)\;1.33 \times 10^{-11}F$
Hence D is the correct answer.