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

  • question_answer
    For a current carrying inductor, emf associated is 20 mV. Now, current through it changes from 6A to 2A in 2s. The coefficient of mutual inductance is:

    A) 1 mH                           

    B) 20 mH  

    C) 2 mH                           

    D) 10 mH

    Correct Answer: D

    Solution :

    (d) 10 mH Here      \[\varepsilon =20mV=20\times {{10}^{-3}}V\] We know that, \[\left| \varepsilon  \right|=M\frac{dl}{dt}\] \[\Rightarrow 20\times {{10}^{-3}}=M\left( \frac{6-2}{2} \right)\]             \[20\times {{10}^{-3}}=M(2)\] \[\Rightarrow M=10\times {{10}^{-3}}H\]             \[=10\,mH\]


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