16. Two charges q, and q2 are separated by a finite distance, r exerting a Coulomb force, F on each other. If the magnitude of both charges are doubled and the separation between them is halved, the new force between them is * A. F B. 2F C. 4F D. 16F 17. An electric field with magnitude E is produced at point P by charge Q. What is the electric field at point 2P? * A. V4E B. yzE C. 2E D. 4E 18. Car batteries are rated in "amp-hours". This is a measure of their * A. current B. charge C. voltage D. power 19. For a positive point charge, the electric field vectors * A. circle the charge. B. point radially inward the charge. C. point radially outward from the charge. D. cross at infinity