As shown in the figure, charges $+q, +q, -q$ and $-q$ are placed on the vertices of a square, each side length is $2l$. The electric potential at the mid-point '$A$' of the charges $+q$ and $+q$ is . . . . . . .
- AZero
- B$\frac{2kq}{l}[1+\frac{1}{\sqrt{5}}]$
- C$\frac{kq}{l}[1-\frac{1}{\sqrt{5}}]$
- D$\frac{2kq}{l}[1-\frac{1}{\sqrt{5}}]$
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