3. A point charge q = +5 C is at the center of a thin conducting spherical shell of radius 1 m, carrying a total charge 5 C as seen in Figure 17.4. +q = 5 C -q=-5.C r R (a) The charge on a conductor is spread out at uniform charge density per unit area on the outer surface of the conductor (why?). What is the charge density on the spherical shell o in C/m ? (b) What is the magnitude and direction of the electric field E(r), at all distances r from the origin where the positive charge is.