Physics - Elecrostatics Question with Solution | TestHub

The energy stored in the electric field produced by a metal sphere is$4.5 \mathrm{J}$. If the sphere contains$4 \mathrm{\mu C}$charge, its radius will be:$\left[\mathrm{T}\mathrm{a}\mathrm{k}\mathrm{e}:\frac{1}{4\pi {\in }_0}=9\times {10}^9 \mathrm{N} {\mathrm{m}}^2 {\mathrm{C}}^{-2}\right]$