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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
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B
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C
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D
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Solution

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,

VTotal=q4πε0(2x(a2x2)]

According to this equation,
at x=a , VTotal=+
at x=+a, VTotal=.
So the graph in option (a) suits this case.

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