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[" A charge "+q" is fixed to each of thr...

[" A charge "+q" is fixed to each of three corners "],[" of a square.On the empty corner a charge "Q],[" is placed such that there is no net electrostatic "],[" force acting on the diagonally opposite charge."],[" Then "],[[" 1) "Q=-2q," 2) "Q=-2sqrt(2)q],[" 3) "Q=-sqrt(2q)," 4) "Q=-4q]]

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