(Ill) Suppose the charge Q on the ring of Fig. 21-28 was
Chapter , Problem 55(choose chapter or problem)
(Ill) Suppose the charge Q on the ring of Fig. 21-28 was alldistributed uniformly on only the upper half of the ring, andno charge was on the lower half. Determine the electricfield E at P. (Take y vertically upward.)
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