A spherical shell and a conducting sphere each of radius R are charged to maximum potential. Which of the two has more charge? My attempt: Since in a conductor, no charge can reside inside the conductor so all charge is on the surface of the conductor just like the spherical shell. Now : Potential(V)=KQ/R K and R are same for both. They are charged to maximum potential. Means there is a limit to the amount of charge the spherical shell and the solid conducting sphere can possess. My question is how to determine who can possess more charge? I think we need to calculate capacitance of a solid sphere and a spherical shell in this. We know the capacitance of an isolated spherical capacitor.But how to calculate the capacitance of a isolated spherical shell?? Please reply soon!