17_InstSolManual_PDF_Part1 - ELECTRIC CHARGE AND ELECTRIC...

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17-1 E LECTRIC C HARGE AND E LECTRIC F IELD 17 Answers to Multiple-Choice Problems 1. D 2. C 3. C 4. B, C 5. E 6. B 7. C 8. A 9. B 10. B 11. D 12. A 13. B 14. C 15. A Solutions to Problems 17.1. Set Up: Unlike charges attract and like charges repel. In a conductor some of the negative charge is free to move. In an insulator the charge can shift position only slightly. Solve: (a) Aluminum is a conductor and negative charge in the sphere moves away from the rod. The distribution of charge is sketched in Figure 17.1a. (b) The charges in the nonconducting sphere displace slightly, with negative charge moving away from the rod. The distribution of charge is sketched in Figure 17.1b. Figure 17.1 17.2. Set Up: Copper is a conductor, so some of the electrons are free to move. The positive charge on the rod attracts the negative charge in the ball. When the ball is connected to the earth by a conducting wire, charge can flow between the ball and the earth. Solve: (a)
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