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JEE Main & Advanced Sample Paper JEE Main Sample Paper-40

  • question_answer
    The mutual inductance of a pair of coils, each of N turns, 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 :

    [a] \[E=\frac{d}{dt}(NMI)\Rightarrow E=NM\frac{dI}{dt}\Rightarrow E=\frac{NMI}{T}\] Emf induced per unit turn \[=\frac{E}{N}=\frac{MI}{t}\]


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