Magnetic field due to currentHard
Question
A and B are two concentric circular loop carrying current i1 and i2 as shown in figure. If ratio of their radii is 1 : 2 and ratio of the flux densities at the centre 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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