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The figure shows two concentric rings, of radii R and R' = 1.96R, that lie on...

The figure shows two concentric rings, of radii R and R' = 1.96R, that lie on the same plane. Point P lies on the central z axis, at distance D = 4.00R from the center of the rings. The smaller ring has uniformly distributed charge Q = 7.00 × 10-6 C. What is the uniformly distributed charge on the larger ring if the net electric field at P is zero?

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