As shown in the fig. charges $+\,q$ and $-\,q$ are placed at the vertices $B$ and $C$ of an isosceles triangle. The potential at the vertex $A$ is
As shown in the fig. charges $+\,q$ and $-\,q$ are placed at the vertices $B$ and $C$ of an isosceles triangle. The potential at the vertex $A$ is
- A
$\frac{1}{{4\pi { \in _0}}}.\frac{{2q}}{{\sqrt {{a^2} + {b^2}} }}$
- B
zero
- C
$\frac{1}{{4\pi { \in _0}}}.\frac{{q}}{{\sqrt {{a^2} + {b^2}} }}$
- D
$\frac{1}{{4\pi { \in _0}}}.\frac{{-q}}{{\sqrt {{a^2} + {b^2}} }}$
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