1. Shells Two spherical conducting shells have non-negligible thickness. Shell 81 carries a net charge of +62 where Q > 0. Shell 82 carries a net charge of 3Q. 31 is inside 32 but is off center. Also, a point charge +Q is xed in place inside 31 but, again, is off center. The system is in electrostatic equilibrium. See the gure below. (a) Find the net charge on the inner and outer surfaces of the two shells. (b) For each of the four surfaces, state whether the charge per unit area is uniform or nonuni- form. Explain your answers