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

  • question_answer
    A coil has an area of 0.05 m2 and it has 800 turns. It is placed perpendicularly in a magnetic field of strength \[4\times {{10}^{-5}}\,Wb/{{m}^{2}},\] it is rotated through \[{{90}^{o}}\] in 0.1 sec. The average e.m.f. induced in the coil is                    [CPMT 2001]

    A)            0.056 V                                   

    B)            0.046 V

    C)            0.026 V                                   

    D)            0.016 V

    Correct Answer: D

    Solution :

                       \[e=-\frac{NBA(\cos {{\theta }_{2}}-\cos {{\theta }_{1}})}{\Delta t}\] \[=-\frac{800\times 4\times {{10}^{-5}}\times 0.05\,(\cos {{90}^{o}}-\cos {{0}^{o}})}{0.1}\]= 0.016 V


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