. Three identical metal balls, A, B, and C are mounted on insulating rods. Ball A has a charge of +q, and balls B and C are initially uncharged. (q is the usual symbol for electric charge). Ball A is touched first to ball B. The two balls are separated and then ball B is touched to ball C. At the end of this experiment, the charge on ball B is: a. +q/2 b. +q/3 c. +q/4 d. -q/2 e. -q/3 f. -q/4 A +q B C