A spherical conductor (radius a) with a charge of +4Q is within a concentric hollow spherical conductor with inner radius b and outer radius c, and having a net charge -20, as shown in the figure below. If Q- 6.0 nC, what are the charges on the inner and outer surfaces of the hollow spherical conductor? -2Q +4Q OA Riuner=0 and gouter -12 nC
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