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
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a
5.4 mH
b
162 mH
c
0.006 mH
d
0.0002 mH
answer is B.
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Detailed Solution
L=μni⇒L2L1=μμ0=(n and i are same )⇒L2=μrL1=900×0.18=162mH