Two concentric and coplanar circular loops P and Q have their radii in the ratio…………….

These are the options for the question :Two concentric and coplanar circular loops P and Q have their radii in the ratio 2:3. Loop Q carries a current 9 A in the
anticlockwise direction. For the magnetic field to be zero at the common centre, loop P must carry

(i) 3A in clockwise direction
(ii) 9A in clockwise direction
(iii) 6 A in anti-clockwise direction
(iv) 6 A in the clockwise direction.

The correct answer is -(iv) 6A in the clockwise direction