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## Homework Statement

A sphere of radius R has a total charge +Q, uniformly distributed throughout its volume. It is surrounded by a thick spherical shell of inner radius R and outer radius 2R carrying a total charge -Q, also uniformly distributed throughout its volume. Using Gauss's law, determine the electric field as a function of r, the distance from the center of the sphere for the regions:

1. 0<=r<=R

2. R<=r<=2R

3. r>=2R

## Homework Equations

Gauss's Law but from there no idea