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Potential at the centre of 1st ring = kQ1/R + kQ2 / R(-/2) Potential at the centre of 2ndt ring = kQ2/R + kQ1 / R(-/2) p.d = k(Q2-Q1){1-1/ -/2 ) / R =k(Q2-Q1)(-/2 -1) / -/2 R (B) ans |
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