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[" A charge "Q" is placed at each of the...

[" A charge "Q" is placed at each of the opposite corners of a "],[" square.A charge "q" is placed at each of the other two "],[" comers.If the net electrical force on "Q" is zero,then "Q/q],[" equals "],[[" (a) "-2sqrt(2)," (b) "-1],[" (c) "1," (d) "-(1)/(sqrt(2))]]

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