A hollow conducting sphere has inner radius R and outer radius 1.5R. A +40nC point charge is placed at the center. What is the total charge on the interior and exterior walls of the sphere?
σ = Qenc/A
The Attempt at a Solution
I'm not too sure where to start. I know Gauss's Law for a sphere is E=Qenc/4πε0r2 , but I don't know where to go from here.
I also know that to find the charge density σ = Qenc/A. Plugging in the knowns I get σ= 3.18*10^-7 C/m^2. I'm not sure if that relates to the problem at all. Any help is appreciated.