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neid z at r , the center of the semicircle? Problem 26. ..27 GO In Fig. 22-51, two curved plastic rods, one of charge +q and the other of charge -q, form a circle of radius R = +q 8.50 cm in an xy plane. The x axis passes through both of the connecting points, P X and the charge is distributed uniformly on both rods. If q = 15.0 pC, what are the -q (a) magnitude and (b) direction (relative to the positive direction of the x axis) of the electric field E produced at P, the Figure 22-51 center of the circle? Problem 27