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Electric potential at a point P,r distan...

Electric potential at a point `P`,`r` distance away due to a point charge located at a point `A` is `V` .If twice of this charge is distributed uniformly on the surface of a hollow sphere of radius `4r` with centre at point `A` ,the potential at `P` now is given as: `(v)/(x)` value of `x` is

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