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

Question

6.28 $\times$ 10^$-$2 T

12.56 $\times$ 10^$-$2 T

12.56 $\times$ 10^$-$4 T

6.28 $\times$ 10^$-$4 T

Solution

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