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Q.

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 +q and –q. The potential difference between the centres of two rings is

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a

$\frac{q}{2 π s_{0}} [\frac{1}{R} - \frac{1}{\sqrt{R^{2} + d^{2}}}]$

b

$\frac{q}{4 π ε_{0}} [\frac{1}{R} - \frac{1}{\sqrt{R^{2} + d^{2}}}]$

c

Zero

d

$\frac{q R}{4 π ε_{0} d^{2}}$

answer is B.

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