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[" 1.Two thin wire rings each having a r...

[" 1.Two thin wire rings each having a radius "R" are "],[" placed at a distance d apart with their axes "],[" coinciding.The charges on the two rings are "+9],[" and - "q" .The potential difference between the "],[" centers of the two rings is "],[" (a) zero "],[" (b) "(Q)/(4 pi varepsilon_(0))[(1)/(R)-(1)/(sqrt(R^(2)+d^(2)))]],[" (c) "(Q)/(4 pi varepsilon_(0))[(1)/(R)-(1)/(sqrt(R^(2)+d^(2)))]],[" (d) "(Q)/(2 pi varepsilon_(0))[(1)/(R)-(1)/(sqrt(R^(2)+d^(2)))]]

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