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please solve the following :- A. A sphere of radius 3 cm, carries a volume charge...

please solve the following :-

A. A sphere of radius 3 cm, carries a volume charge density of 5 − ??2, where d is constant. Find the value of d so the Electric field vector is zero outside the sphere?

B.Two conducting spheres of radius 10 cm each. The center-to-center distance between the two spheres is 2 meters. Each sphere carries a charge of 16μC. Find the potential in the middle between the two spheres.

C. Two conducting, concentric spheres of radii a and b, respectively. Use the electric potential to find its capacitance.

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