A negative point charge −Q is at the center of a hollow insulating spherical shell, which has an inner radius R1 and an outer radius R2. There is a total charge of +3Q spread uniformly throughout the...

A negative point charge −Q is at the center of a hollow insulating spherical shell, which has an inner radius R1 and an outer

radius R2. There is a total charge of +3Q spread uniformly throughout the volume of the insulating shell, not just on its

surface. Determine the electric field for