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

  • question_answer
    In a coil of area \[10\ c{{m}^{2}}\] and 10 turns with a magnetic field directed perpendicular to the plane and is changing at the rate of \[{{10}^{8}}\]gauss/second. The resistance of the coil is 20 ohm. The current in the coil will be         [CPMT 1976]

    A)            5 amp                                     

    B)            0.5 amp

    C)            0.05 amp                               

    D)            \[5\times {{10}^{8}}\ amp\]

    Correct Answer: A

    Solution :

               \[I=\frac{e}{R}=\frac{-N\left( d\varphi /dt \right)}{R}=\frac{10\times {{10}^{8}}\times {{10}^{-4}}\times {{10}^{-4}}\times 10}{20}\]= 5 A


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