Magnetic field due to currentHard
Question
A and B are two concentric circular conductors of centre O and carrying current i1 and i2 as shown in the diagram. 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 
will be : -
will be : -Options
A.
B.
C.
D.
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