PhysicsMedium46×since 2002Q6994Two thin wire rings each having a radius RRR are placed at a distance ddd apart with their axes coinciding. The charges on the two rings are +q+q+q and −q.-q.−q. The potential difference between the centres of the two rings isAq2π ∈0[1R−1R2+d2]{q \over {2\pi \,{ \in _0}}}\left[ {{1 \over R} - {1 \over {\sqrt {{R^2} + {d^2}} }}} \right]2π∈0q[R1−R2+d21]BqR4π ∈0 d2{{qR} \over {4\pi \,{ \in _0}\,{d^2}}}4π∈0d2qRCq4π ∈0[1R−1R2+d2]{q \over {4\pi \,{ \in _0}}}\left[ {{1 \over R} - {1 \over {\sqrt {{R^2} + {d^2}} }}} \right]4π∈0q[R1−R2+d21]DzeroCheck answerSkip