A long solenoid of radius 1 mm has 100 turns per mm. If 1 A current flows in the solenoid, the magnetic field strength at the centre of the solenoid is

1. A. 12.56 10 -2 T
2. B. 12.56 10 -4 T
3. C. 6.28 10 -4 T
4. D. 6.28 10 -2 T

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