The inner sphere has a net charge of 6 C and the shell has a net charge

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The inner sphere has a net charge of −6 μC and the shell has a net charge of +2 μC.

A conducting sphere (radius a) is placed at the center of a conducting spherical shell (inner radius b and outer radius c). The conductors are in electrostatic equilibrium. For the given charges: 

(a) Sketch a field line diagram. 

(b) Determine the charge on the inner and outer surfaces of the shell. 

(c) Sketch a graph of Er, the radial component of the field, as a function of r. (Er > 0 if the field is radially outward and Er < 0 if the field is radially inward.)

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