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BCECE Engineering BCECE Engineering Solved Paper-2010

  • question_answer
    The mutual inductance of a pair of coils, each of N rums, is M henry If a current of i ampere in one of the coils is brought to zero in t second, the emf induced per turn in the other coil, in volt will be

    A) \[\frac{Mi}{t}\]                                

    B) \[\frac{NMi}{t}\]

    C) \[\frac{MN}{it}\]                             

    D)        \[\frac{Mi}{Nt}\]

    Correct Answer: A

    Solution :

    Induced emf,   \[e=M\frac{di}{dt}\](in magnitude) \[\Rightarrow \]               \[e=NM\left( \frac{i}{t} \right)\] \[\Rightarrow \]               \[\frac{e}{N}=\frac{Mi}{t}\]


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