Chapter 22, Problem 17P

Two charged beads are on the plastic ring in Fig. 22-44a. Bead 2, which is not shown, is fixed in place on the ring, which has radius R = 60.0 cm. Bead 1, which is not fixed in place, is initially on the x axis at angle θ = 0°. It is then moved to the opposite side, at angle θ = 180°, through the first and second quadrants of the xy coordinate system. Figure 22-44b gives the x component of the net electric field produced at the origin by the two beads as a function of θ, and Fig. 22-44c gives the y component of that net electric field. The vertical axis scales are set by E_xs = 5.0 × 10⁴ N/C and E_ys = −9.0 × 10⁴ N/C. (a) At what angle θ is bead 2 located? What are the charges of (b) bead 1 and (c) bead 2?

Figure 22-44 Problem 17.