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

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

(1) 12.56 × 10- 4 T

(2) 6.28 × 10- 4 T

(3) 6.28 × 10- 2 T

(4) 12.56 × 10- 2 T

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