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Four charges - q,-q,+ q and +q are place...

Four charges - q,-q,+ q and +q are placed at the corners of a square of side 2 L is shown in figures. The electric potential at point. A midway between the two charges + q and + q is -

A

`(1)/(4pi in_0)(2q)/(L) (1-(1)/(sqrt5))`

B

`(1)/(4piin_0) (2q)/(L) (1+(1)/sqrt(5))`

C

`(1)/(4piin_0)(q)/(2L)(1-(1)/(sqrt(5)))`

D

Zero

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