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The figure below shows two concentric rings, of radii R and R' = 3R, that lie on the same plane.
Point P lies on the central r-axis, at distance D = 2R from the center of the rings. The smaller ring
has uniformly distributed charge +Q. In terms of +Q, what is the uniformly distributed charge on the
larger ring if the net electric field at P is zero? (modified from Halliday et al., 2015, Chapter 22,
Problem 30).
y
P
R

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