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[" 51.Four elactrise charges "+q,+q,-q" ...

[" 51.Four elactrise charges "+q,+q,-q" and "-q" are placed at "],[" the comers of a square of side "2L" .The electric "],[" poterntial at point "A" ,midway between the two "],[" charges "4" and "+q" ,is "],[[" (a) "(1)/(4ac+(2)/(b))(1+(1)/(sqrt(5)))," (b) "(1)/(4 pi varepsilon_(0))(2q)/(L)(1-(1)/(sqrt(5)))],[" (d) aree "," (d) "(1)/(4 pi)(2q)/(4)(1+sqrt(5))]]

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