21 40 A and B are two concentric circular conductors of

Last updated: 6/8/2023

21 40 A and B are two concentric circular conductors of centre O and carrying currents and 2 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 1 12 is B 1 1 4 1 1 2 14