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Two concentric and coplanar circular loo...

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

A

3A in clockwise direction

B

9A in clockwise direction

C

6 A in anti-clockwise direction

D

6 A in the clockwise direction.

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