PhysicsMedium46×since 2002Q7017The two thin coaxial rings, each of radius 'a' and having charges +Q and −-−Q respectively are separated by a distance of 's'. The potential difference between the centres of the two rings is :AQ2πε0[1a+1s2+a2]{Q \over {2\pi {\varepsilon _0}}}\left[ {{1 \over a} + {1 \over {\sqrt {{s^2} + {a^2}} }}} \right]2πε0Q[a1+s2+a21]BQ4πε0[1a+1s2+a2]{Q \over {4\pi {\varepsilon _0}}}\left[ {{1 \over a} + {1 \over {\sqrt {{s^2} + {a^2}} }}} \right]4πε0Q[a1+s2+a21]CQ4πε0[1a−1s2+a2]{Q \over {4\pi {\varepsilon _0}}}\left[ {{1 \over a} - {1 \over {\sqrt {{s^2} + {a^2}} }}} \right]4πε0Q[a1−s2+a21]DQ2πε0[1a−1s2+a2]{Q \over {2\pi {\varepsilon _0}}}\left[ {{1 \over a} - {1 \over {\sqrt {{s^2} + {a^2}} }}} \right]2πε0Q[a1−s2+a21]Check answerSkip