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.....$mH$.

  • A
    $5.4$
  • B
    $162$
  • C
    $0.006$
  • D
    $0.0002$

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