A point charge of -2Q is at the center of a spherical shell of radius R carrying

Question:

A point charge of -2Q is at the center of a spherical shell of radius R carrying charge Q spread uniformly over its surface. Find the electric field at
(a) r = 1/2R
(b) r = 2R.
(c) How would your answers change if the charge on the shell were doubled?

Fantastic news! We've Found the answer you've been seeking!