A and B are two concentric circular coils having centre at O and carrying currents I1 and I....

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A and B are two concentric circular coils having centre at O and carrying currents I1 and I2 as shown in the adjacent figure. If ratio of their radii is 1:2 and ratio of the magnetic flux densities at O due to A and B is 1: 3 then the value of I1/I2 is 
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