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[" Three charges "+Q,quad q,+Q" are plac...

[" Three charges "+Q,quad q,+Q" are placed "],[" respectively,at distance,"0,d/2" and "d" from "],[" the origin,on the "x" -axis.If the net force "],[" experienced by "+Q," placed at "x=0," is zero,"],[" then value of "q" is "],[[" (a) "+Q/4," (b) "-Q/2," (c) "+Q/2," (d) "-Q/4]]

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