In the figure two curved plastic rods, one of charge +q and the other of charge -q, form a circle of radius R = 7.72 cm in an xy plane. The * axis passes through both of the connecting points, and the charge is distributed uniformly on both rods. If q = 13.0 pC, what is the magnitude of the electric field produced at P, the center of the circle? + 9 P -4 Number i Units v