Chapter 20, Problem 82PP

The difference between Figs. 20.38a and 20.38b that results in an external electric field in one ease but not the other is that

1. a. there’s no net charge in Fig. 20.38a but there is a net charge in Fig. 20.38b.
2. b. the total charge is greater in Fig. 20.38a.
3. c. the charge is distributed in Fig. 20.38b so there’s more negative charge to the left and more positive charge to the right.