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Two circular loops A and B of radii R an...

Two circular loops A and B of radii R and 4R are kept concentrically in the same plane. The loops carry currents `I_(1)` and `I_(2)` respectively. If the magnetic field at a point on the common axis of the loops at a distance 2R from their common centre is zero, the ratio `(I_(1))/(I_(2))` is _________.

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