**A thin nonconducting rod with a uniform distribution of positive charge Q is bent into a c**

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A thin nonconducting rod with a uniform distribution of positive charge Q is bent into a circle of radius R (Fig. 22-43). The

central perpendicular axis through the ring is a z axis, with the origin at the center of the ring. What is the magnitude of

the electric field due to the rod at (a)z = 0 and (b)z = ∞? (c) In terms of R, at what positive value of z is that

magnitude maximum? (d) If R = 2.23 cm and Q = 4.08 μC, what is the maximum magnitude?

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