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In the figure two curved plastic rods, one of charge +q and the other of charge -q, form a circle of radius R = 3.93 cm in an xy plane. The x axis passes through both of the connecting points, and the charge is
distributed uniformly on both rods. If q = 13.5 pC, what is the magnitude of the electric field produced at P, the center of the circle?
+q
-4

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