| January 28, 2015

A circular plastic disk with radius R  2.00 cm has a uniformly distributed charge Q(2.00  106)e on one face. A circular ring of width 30 mm is centered on that face, with the center of that width at radius r  0.50 cm. In coulombs, what the charge is contained within the width of the ring?

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The Effects of War and Peace on Foreign Aid

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