A circular plastic disk with radius R ! 2.00 cm has a
Chapter , Problem 36(choose chapter or problem)
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 charge is contained within the width of the ring?
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