A metal cube of side \(5\mathrm{cm}\) is charged with \(6\mu \mathrm{C}\). The surface charge density on the cube

\(0.125\times {10}^{-3}{\mathrm{Cm}}^{-2}\)

\(0.25\times {10}^{-3}{\mathrm{Cm}}^{-2}\)

\(4\times {10}^{-3}{\mathrm{Cm}}^{-2}\)

\(0.4\times {10}^{-3}{\mathrm{Cm}}^{-2}\)