Four electric charges +q,+q,-q and -q ar...

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

`(1)/(4pi epsilon_(0)) (2q)/(L) (1+(1)/(sqrt(5)))`

`(1)/(4pi epsilon_(0)) (2q)/(L) (1-(1)/(sqrt(5))`

zero

`(1)/(4pi epsilon_(0))(2q)/(L) (1+sqrt(5))`

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