A long solenoid of 50 cm length having 100 turns carries a current of 2.5 A. The magnetic field at the centre of the solenoid is : ( 0 = 4 10 -7 T m A -1 )

1. A. 3.14 10 -4 T
2. B. 6.28 10 -5 T
3. C. 3.14 10 -5 T
4. D. 6.28 10 -4 T

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