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[" 6.Four electric charges "+q,+q,-q" an...

[" 6.Four electric charges "+q,+q,-q" and "-q" are placed at "],[" the corners of a square of side "2L" (see figure).The electric "],[" potential at point "A," mid-way between the two charges "+q],[" and "+q" ,is "],[[" (1) "(1)/(4 pi varepsilon_(0))(2q)/(L)(1+(1)/(sqrt(5)))," (AIPMT 2011] "],[" (2) "(1)/(4 pi varepsilon_(0))(2q)/(L)(1-(1)/(sqrt(5))),(1)/(L)|_(A)],[" (3) "" zero ",(1)/(1)],[" (4) "(1)/(1 pi c)(2q)/(I)(1+sqrt(5))," (") "]]

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