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