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

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

Electromagnetic Induction

Solution:

$L \propto \mu \Rightarrow \frac{L_{2}}{L_{1}}=\frac{\mu}{\mu_{0}}$
( $n$ and $i$ are same)
$\Rightarrow L_{2}=\mu_{r} L_{1}=900 \times 0.18=162\, mH$