Figure 21-29a shows an arrangement of three charged
Chapter 21, Problem 20(choose chapter or problem)
Figure 21-29a shows an arrangement of three charged particles separated by distance d. Particles A and C are fixed on the x axis, but particle B can be moved along a circle centered on particle A. During the movement, a radial line between A and B makes an angle () relative to the positive direction of the x axis (Fig. 21-29b). The curves in Fig. 21-29c give, for two situations, the magnitude Fuel of the net electrostatic force on particle A due to the other particles. That net force is given as a function of angle () and as a multiple of a basic amount Fo. For example on curve 1, at () = 1800 , we see that Fnet = 2Fo. (a) For the situation corresponding to curve 1, what is the ratio of the charge of particle C to that of particle B (including sign)? (b) For the situation corresponding to curve 2, what is that ratio? 2 I--d-+-d-.j " $ @ x A B e " (a) ~~ }{eB II x 900 1800 A e () (b) (c) Fig. 21-29 20
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