Figure 21-30a shows an arrangement of three charged

Chapter , Problem 20

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Figure 21-30a 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 u relative to the positive direction of the x axis (Fig. 21-30b). The curves in Fig. 21-30c give, for two situations, the magnitude Fnet of the net electrostatic force on particle A due to the other particles.That net force is given as a function of angle u and as a multiple of a basic amount F0. For example on curve 1, at u # 180-, we see that Fnet # 2F0. (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? net 2 1 0 90 180 1 2 (a) (b) (c) x x A C B A C B d d d Figure 21-30 20.