The concentric loops of radii (r) and (2r) each carries the same current (I) when a current of intensity 12A passing through a long wire, as shown in the figure, the total magnetic flux density at the center of the loop circuits is 510-$T, so the value of (I) equals: Knowing that (r = 5cm, lair = 4xx10-7 Wb/A.m and n = 3.14). (A) 2.05A () 2.50A 12A (C) 1.08A 3r |(D) 1.8A r 2r