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B X and B Y are the magnetic field at the centre of two coils X and Y respectively each carrying equal current. If coil X has 200 turns and 20 cm radius and coil Y has 400 turns and 20 cm radius, the ratio of B X and B Y is

1. 1 : 1
2. 1 : 2
3. 2 : 1
4. 4 : 1

Correct answer: 1 : 2

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