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

  • question_answer
    A coil has 1,000 turns and 500 cm2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of \[2\times {{10}^{-5}}\,Wb/{{m}^{2}}\]. The coil is rotated through \[{{180}^{o}}\] in 0.2 seconds. The average e.m.f. induced in the coil, in milli-volts, is                                                                            [EAMCET 2003]

    A)            5    

    B)            10

    C)            15  

    D)            20

    Correct Answer: B

    Solution :

                       By using \[e=-\frac{NBA\left( \cos {{\theta }_{2}}-\cos {{\theta }_{1}} \right)}{\Delta t}\]                    \[e=-\frac{1000\times 2\times {{10}^{-5}}\times 500\times {{10}^{-4}}\left( \cos {{180}^{o}}-\cos {{0}^{o}} \right)}{0.2}\]            \[={{10}^{-2}}volt=10mV\]


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