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The coefficient of self-inductance of a ...

The coefficient of self-inductance of a solenoid is `0.18 mH`. If a crude of soft iron of relative permeability `900` is inserted, then the coeffcient of self-inductance will become nearly

A

`5.4 mH`

B

`162 mH`

C

`0.006 mH`

D

`0.0002 mH`

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The correct Answer is:
B
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