Electricity, Magnetism and Waves.

A spherically symmetric volume charge distribution is given by

Rho® = k*r for r (less than or equal to) a

0 for r > a
a) what is the electric field both inside and outside the sphere
b) what is the potential at any point inside the sphere
c) How much energy was required to assemble the sphere

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...try of the problem proscribes that the electric field on the Gauss' surface has constant magnitude and has only radial component. Thus, equation (1.3) becomes:
Inside the sphere

Outside ...