Question

A solid insulating sphere of radius R has a charge of Q, (Q > 0) placed on it, uniformly distributed throughout its volume. Surrounding the sphere is a spherical conducting shell with inner radius 2R and outer radius 3R and has a charge of −2Q placed on it. The sphere and the shell share the same center.

1A: Determine the magnitude of the electric field, E(r), where r is the distance from the center of the sphere

1B: Determine the electric potential, V (r), setting V (∞) = 0

3C: Graph V (r)

Answer 1

I am providing the solution attached below.

Thank you