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A long solenoid of radius 1mm has 100 tu...

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

A

`6.28 x 10^-2` T

B

`12.56 x 10^-2` T

C

`12.56 x 10^-4` T

D

`6.28 x 10^-4` T

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