. (20 points) A solid (ungrounded) conducting sphere of radius a and charge -2q is lo- cated at the origin. A point charge of +q is placed above the conducting sphere at a distance L from the origin, and another one (also of charge +q) is placed at a distance L below the origin. +9 L +9 -29 (a) (10 points) Find the potential V (r) everywhere outside the conducting sphere. ( Take V = 0 at infinity.) (b) (5 points) What is the potential of the conducting sphere? (c) (5 points) Determine the electric field everywhere outside the conducting sphere.