1. The problem statement, all variables and given/known data A +30mC point charge sits at the center of a spherical thick metal shell, of 4.0cm inner radius, and 2.0cm thickness. The net charge on the shell is -50mC. 2. Relevant equations 3. The attempt at a solution I came up with several conclusions and I'm not really sure which one is right. I'm just looking for a confirmation of how this charge would distribute itself. I learned that in such a case as this, an equal and opposite amount of charge would distribute itself across the inner surface of the shell, so -30mC. Since the net charge is then -50mC, that means that -20mC must be on the outer surface. That didn't really make much sense to though me since there is no where for a positive charge on the shell. So does that mean there's a charge of -80mC on the inner surface of the shell, and +30mC on the outside? or is it just one big negatively charged conductor?