Question

Charged +q and -q are placed at -a and +a on x-axis,potential at any point on x-axis is best represented by which graph.

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

For a point ($x$,0) in the plane, the potential at that point due to both charges is given as,

$V_{Total}=\frac{q}{4{\mathrm{\pi \epsilon }}_0}\left(\frac{-2x}{\left(}\right]$

According to this equation,
at $x=-a$ , $V_{Total}=+\infty$
at $x=+a$, $V_{Total}=-\infty$.
So the graph in option (a) suits this case.