Physics - Electrostatics Question with Solution | TestHub

A small uncharged conducting sphere is placed in contact with an identical sphere but having $4\times 10^{-8}\mathrm{C}$ charge and then removed to a distance such that the force of repulsion between them is $9\times 10^{-3}\mathrm{N}$. The distance between them is (Take $\frac{1}{4\pi {ϵ}_{\mathrm{o}}}$ as $9\times 10^9\mathrm{in}\mathrm{SI}$ units)