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A charge 2 muC is taken from inifinity p...

A charge `2 muC` is taken from inifinity point in an electric field, without changing its velocity. If work done against eletrostatic forces is `-40 mu J`, then find the potential at that point.

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`V = W_("ext")/q = (-40 mu J)/(2 mu C) = -20 V`.
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