Let R and r be the radii of bigger and each smaller drop respectively ∴
4
3
πR3=8×
4
3
πr2 ⇒R=2r.....(i) The capacitance of a smaller spherical drop is C=4πε0r.....(ii) The capacitance of bigger drop is C′=4πε0R =2×4πε0r     (∴R=2r) =2c     [from Eq. (ii)] C=