P and Q are two concentric circular Loop carrying current i1 and i2 as shown in fig. If ratio of their radii is 3:2 and of their magnetic field at the centre O due to P and Q is 1:3, then the value of i1/i2 will be - ratio (A) 1/2 (B)1/3 (D) 1/6 (C) 1/4​