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Electrostatics question

2005 · Shift 0 · Q161
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Electrostatics question

2005 · Shift 0 · Q161

JEE MainPhysicsElectrostaticsMCQ+4 / −1
Two 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 is
  1. A
    q2π ∈0[1R−1R2+d2]{q \over {2\pi \,{ \in _0}}}\left[ {{1 \over R} - {1 \over {\sqrt {{R^2} + {d^2}} }}} \right]2π∈0​q​[R1​−R2+d2​1​]
  2. B
    qR4π ∈0 d2{{qR} \over {4\pi \,{ \in _0}\,{d^2}}}4π∈0​d2qR​
  3. C
    q4π ∈0[1R−1R2+d2]{q \over {4\pi \,{ \in _0}}}\left[ {{1 \over R} - {1 \over {\sqrt {{R^2} + {d^2}} }}} \right]4π∈0​q​[R1​−R2+d2​1​]
  4. D
    zero
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