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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Faraday's and Lenz's Law

  • question_answer
    In a magnetic field of 0.05T, area of a coil changes from \[101\,c{{m}^{2}}\] to \[100\,c{{m}^{2}}\] without changing the resistance which is 2W. The amount of charge that flow during this period is [Orissa PMT 2005]

    A)            \[2.5\times {{10}^{-6}}\]coulomb                                   

    B)            \[2\times {{10}^{-6}}\]coulomb

    C)            \[{{10}^{-6}}\]coulomb    

    D)            \[8\times {{10}^{-6}}\]coulomb

    Correct Answer: A

    Solution :

                       \[\varphi =BA\]                    Þ change in flux \[d\varphi =B.dA\]= \[0.05\ (101-100)\ {{10}^{-4}}\]                                                                 \[={{5.10}^{-6}}\]Wb.            Now, charge \[dQ=\frac{d\varphi }{R}=\frac{5\times {{10}^{-6}}}{2}=2.5\times {{10}^{-6}}\]C.


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