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B are two concentric circular conductors...

B are two concentric circular conductors of centre O and carrying currents i, and i, as shown in the adjacent figure. If ratio of their radii is 1:2 and ratio of the flux densities at O due to A and B is 1:3, then the value of ili, is (A) 1/6 (B) 1/4 (C) 1/3 (D) 1/2 12

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