5. (15 pts) A hollow metal sphere has inner radius a and outer radius b. The hollow sphere has charge +2Q. A point charge +Q sits at the center of the hollow sphere. a) (5pts) Find the electric fields in the inner region r Sa. For full credit, draw a Gaussian's surface. b) (5pts) Find the electric fields in the region a<r<b. For full credit, draw a Gaussian's surface. c) (5pts) Find the electric fields in the outer region r > b. For full credit, draw a Gaussian's surface.