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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Static EMI

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    An e.m.f. of 100 millivolts is induced in a coil when the current in another nearby coil becomes 10 ampere from zero in 0.1 second. The coefficient of mutual induction between the two coils will be     [MP PET 1996; Kerala PMT 2004]

    A)            1 millihenry                           

    B)            10 millihenry

    C)            100 millihenry                      

    D)            1000 millihenry

    Correct Answer: A

    Solution :

                       Induced \[e.m.f.\ \ e=M\frac{di}{dt}\Rightarrow 100\times {{10}^{-3}}=M\left( \frac{10}{0.1} \right)\]            \[\therefore \ M={{10}^{-3}}H=1\ mH\]


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