0.20 m 0.10 m -100 V +100 V Two thin, concentric, conducting spherical shells, insulated from each other, have radii of 0.10 m and 0.20 m, as shown above. The inner shell is set at an electric potential of -100 V, and the outer shell is set at an electric potential of +100 V, with each potential defined relative to the conventional reference point. Let Q and Q represent the net charge on the inner and outer shells, respectively, and let r be the radial distance from the center of the shells. Express all algebraic answers in terms of Q. Q, r, and fundamental constants, as appropriate. (a) Using Gauss's Law, derive an algebraic expression for the electric field E(r) for 0.10 m 0.20 m.