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[" Four equal point charges "Q" each are placed in "],[" the xy plane at "(0,2),(4,2),(4,-2)" and "(0,-2)],[" The work required to put a fifth charge "Q" at the "],[" origin of the coordinate system will be : "],[[" (1) "(Q^(2))/(2sqrt(2)pi varepsilon_(0))," (2) "(Q^(2))/(4 pi varepsilon_(0))(1+(1)/(sqrt(5)))],[" (3) "(Q^(2))/(4 pi varepsilon_(0))(1+(1)/(sqrt(3)))," (4) "(Q^(2))/(4 pi varepsilon_(0))]]

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