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Question

Three charged particles having charges q, -2q and q are placed in a line at points (-a,0), (0,0) and (a,0) respectively. Find the expression for electric potential at P(r,0) for r > a.

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Solution

$V = \frac{k q}{(r + a)} + \frac{k (- 2 q)}{r} + \frac{k q}{(r - a)}$

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