1.

A and B are concentric circular conductors with center O and carrying currents I1 and I2 as shown in fig. The ratio of their radii is 1: 2 and ratio of their flux densities at O is 1:3 The value of I1I2 is

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A and B are concentric circular conductors with center O and carrying currents I1 and I2 as shown in fig. The ratio of their radii is 1: 2 and ratio of their flux densities at O is 1:3 The value of I1I2 is






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