Equal charges q are placed at the three ...

Equal charges q are placed at the three corners B, C, D of a square ABCD of side a. The potential at A is

`1/(4 pi epsi_(0))q/a`

`(3q)/(4 pi epsi_(0))`

`q/(4 pi epsi_(0)a)[2+1/sqrt2]`

`q/(4 pi epsi_(0)a)[1+sqrt2]`

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