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Consider two uniformaly charged concentr...

Consider two uniformaly charged concentric and coaxial rings of radii R and 2R. Total charge on inner ring is `Q_(1)` and that on outer ring is `Q_(2)`. Both rings are revolving in same sence with same angular velocity about its axis. If net magnetic induction at a distance R feom the centre of the rings, on axis of rings is zero then `(Q_(1))/(Q_(2))` is :

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