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Electrostatics question

2021 · 26 Aug · Shift 2 · Q52
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  5. /2021 · 26 Aug · Shift 2 · Q52

Electrostatics question

2021 · 26 Aug · Shift 2 · Q52

JEE MainPhysicsElectrostaticsMCQ+4 / −1
The 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 :
  1. A
    Q2πε0[1a+1s2+a2]{Q \over {2\pi {\varepsilon _0}}}\left[ {{1 \over a} + {1 \over {\sqrt {{s^2} + {a^2}} }}} \right]2πε0​Q​[a1​+s2+a2​1​]
  2. B
    Q4πε0[1a+1s2+a2]{Q \over {4\pi {\varepsilon _0}}}\left[ {{1 \over a} + {1 \over {\sqrt {{s^2} + {a^2}} }}} \right]4πε0​Q​[a1​+s2+a2​1​]
  3. C
    Q4πε0[1a−1s2+a2]{Q \over {4\pi {\varepsilon _0}}}\left[ {{1 \over a} - {1 \over {\sqrt {{s^2} + {a^2}} }}} \right]4πε0​Q​[a1​−s2+a2​1​]
  4. D
    Q2πε0[1a−1s2+a2]{Q \over {2\pi {\varepsilon _0}}}\left[ {{1 \over a} - {1 \over {\sqrt {{s^2} + {a^2}} }}} \right]2πε0​Q​[a1​−s2+a2​1​]
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