First slide
Inductance
Question

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

Moderate
Solution

L=μniL2L1=μμ0=(n and i are same )L2=μrL1=900×0.18=162mH

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