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A point charge Q is located at (0,-4,0) while a 10nC charge is uniformly distributed along a semicircular ring as shown in Fig.
A point charge Q is located at (0,-4,0) while a 10nC charge is uniformly distributed along a semicircular ring as shown in Fig. 4.25 (semi circle in the xy plane from x= -2 to x =2, y=2) Find the value of Q such that E(0,0,0) =0.