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NEET Sample Paper NEET Sample Test Paper-92

  • question_answer
    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.

    A) 5.4 mH

    B)                    162 mH

    C) 0.006 mH         

    D)        0.0002 mH

    Correct Answer: B

    Solution :

    [b] \[L={{\mu }_{0}}\,nI\] \[\therefore \] \[\frac{{{L}_{2}}}{{{L}_{1}}}=\frac{\mu }{{{\mu }_{0}}}\]         ---- (\[\because \] n and I are same) \[\therefore \] \[{{L}_{2}}={{\mu }_{1}}{{L}_{1}}=900\times 0.18=162\,mH\]


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