A solid sphere made of conductive material, radius a has a positive charge amount of 20. A spherical conducting shell, with inner radi us b = 2a and outer radius c 3a is concentric to the sphere. An amount of -Q is deposited on the shell. Once electrostatic eq uilibrium is reached, how much electrical charge is present on the surface of the shell of radius C? (Conductors are insulated) O 2Q -Q O +Q
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