3. Two metal spheres, A and B are placed on their respective insulating stands. The net charge on each sphere is zero. Four things are done next: without touching the spheres directly, (1) the spheres are moved so that they touch each other; (2) a negatively charged plastic rod is placed near sphere B; (3) the spheres are moved apart; and (4) the rod is removed. Which of the following describes the subsequent charge on each sphere? B AB (2) (3) (1) a. A and B will both be positive. b. A will be negative; B will be positive. c. A will be positive; B will be negative. d. Both spheres remain uncharged, as before.

3. Two metal spheres, A and B are placed on their respective insulating stands. The net charge on each sphere is zero. Four things are done next: without touching the spheres directly, (1) the spheres are moved so that they touch each other; (2) a negatively charged plastic rod is placed near sphere B; (3) the spheres are moved apart; and (4) the rod is removed. Which of the following describes the subsequent charge on each sphere? B AB (2) (3) (1) a. A and B will both be positive. b. A will be negative; B will be positive. c. A will be positive; B will be negative. d. Both spheres remain uncharged, as before.