A tightly wound 100 turns coil of radius 10 cm carries a current of 7 A. The magnitude of the magnetic field at the centre of the coil is (Take permeability of free space as 4 10 -7 SI units):

1. A. 44 mT
2. B. 4.4 T
3. C. 4.4 mT
4. D. 44 T

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