Figure a 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 0 relative to the positive direction of the x axis (Figure b).The curves in Figure c give, for two situations, the magnitude F net 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 F0. For example on curve 1, at ? = l80o, we see that F net = 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?

(a) B. 0 90 180 (6) (c)