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A circular coil of diameter 2 cm and 100...

A circular coil of diameter 2 cm and 100 turns is placed at the centre of a long solenoid of radius 5 cm and `10 turns//cm`. The mutual inductance of the two coils will be nearest to:

A

`40 muH`

B

`4 muH`

C

40 mH

D

4 mH.

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