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(a) The charges each Q are placed at x -...

(a) The charges each `Q` are placed at `x - d , 2d , 4d ,…oo`. Find electric potential at origin `O`.
(b) A charge `+Q` is placed at each of the points `x = d , x = 3d ,x = 5d ,…..,oo` on the `x`-axis , and a charge `-Q` is placed at each of the points `x = 2d , x = 4d , x= 6d , ...,oo`.Find the electric potential at the origin `O`.

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