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A and B are two concentric circular cond...

A and B are two concentric circular conductors of centre O and carrying currents `I_1` and `I_2` as shown
in the adjacent figure. The ratio of their radii is `1 : 2` and ratio of the flux densities at O due to A and B is `1 : 3`. The value of `I_1//I_2` is

A

`1//4`

B

`1//6`

C

`1//3`

D

`1//2`.

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