A) 0.0002 mH
B) 0.006 mH
C) 5.4 mH
D) 162 mH
Correct Answer: D
Solution :
We know that, \[L=\mu ni\] \[\therefore \] \[\frac{{{L}_{2}}}{{{L}_{1}}}=\frac{\mu }{{{\mu }_{0}}}\] (as n and i are same) \[\Rightarrow \] \[{{L}_{2}}=\frac{\mu }{{{\mu }_{0}}}\times {{L}_{1}}={{\mu }_{r}}{{L}_{1}}\] \[=900\times 0.18=162\text{ }mH\]
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