Two concentric rings, of radii R and 2R, lie on the y-z plane and at the origin as shown in the figure. Point P lies on the x axis, at x = 2R. Both rings contain uniformly distributed charges. The charge on the outer ring is Q. What is the total charge on the inner ring if the net electric potential at P is zero?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.