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12th Class Physics Electro Magnetic Induction Question Bank MCQ - Electromagnetic Induction

  • question_answer
    Two coils of self-inductance 4 mH and 9 mH are placed so close together that the effective flux in one coil is completely linked with the other. The natural inductance between these coils are:

    A) 16m H                         

    B) 10 mH  

    C) 26 mH                         

    D) 6 mH

    Correct Answer: D

    Solution :

    (d) 6 mH Mutual inductance between coils is             \[M=K\sqrt{{{L}_{1}}\times {{L}_{2}}}\]             \[=1\sqrt{4\times {{10}^{-3}}\times 9\times {{10}^{-3}}}(\because \,K=1)\]             \[=6\times {{10}^{-3}}H=6\,mH\]


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