17-1ELECTRICCHARGE ANDELECTRICFIELD17Answers to Multiple-Choice Problems1.D2.C3.C4.B, C5.E6.B7.C8.A9.B10.B11.D12.A13.B14.C15.ASolutions to Problems17.1.Set Up:Unlike charges attract and like charges repel. In a conductor some of the negative charge is free tomove. 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 ofcharge is sketched in Figure 17.1a.(b)The charges in the nonconducting sphere displace slightly, with negative charge moving away from the rod. Thedistribution of charge is sketched in Figure 17.1b.Figure 17.117.2.Set Up:Copper is a conductor, so some of the electrons are free to move. The positive charge on the rodattracts the negative charge in the ball. When the ball is connected to the earth by a conducting wire, charge can flowbetween the ball and the earth.Solve: (a)
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