A sphere with a radius of R has a total charge of 4Q that is uniformly distributed. There is also a point charge of -Q that is at the center of the sphere. Using a gaussian surface, derive an equation for the electric field strength for a radius less than R. (in other words the equation for the feild strength inside of the sphere)

A sphere with a radius of R has a total charge of 4Q that is uniformly distributed. There is also a point charge of -Q that is at the center of the sphere. Using a gaussian surface, derive an equation for the electric field strength for a radius less than R. (in other words the equation for the feild strength inside of the sphere)