Q5 (5 pts) Electrical charge is distributed uniformly with volume charge density ρ inside a spherical shell of inner radius a and outer radius b. There is a positive point charge Q located at the center. Electric field inside the shell is given by E→ = Cr where C is a positive constant r is the radial distance from the center. (a) Calculate ρ of the spherical shell. (b) Calculate the E field for r > b.