Two charged concentric metal spheres have radii of 3.000 cm and 3.500 cm. Calculate the charge in nC on the inner sphere if the radial electric field at a radial distance 3.125 cm is 7.366e+04 N/C. I tried using Gausses law of EA = Q/e0 then after getting Q I would take the average charge per area. Then I would simply enter in to the equation Q=o(greek letter)A the area of the inner sphere, but that's wrong any suggestions? I've been having trouble with magnetism so any help is appreciated, thanks.