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

  • question_answer
    The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength \[4\times {{10}^{-4}}Wb/{{m}^{2}}\], if rotated through 90o in 0.1 s, the average emf induced in the coil is [Pb. PET 2002]

    A)            0.012 V                                   

    B)            0.05 V

    C)            0.1 V                                        

    D)            0.2 V  

    Correct Answer: D

    Solution :

               \[e=\frac{-NBA(\cos {{\theta }_{2}}-\cos {{\theta }_{1}})}{\Delta t}\]            \[=-\frac{500\times 4\times {{10}^{-4}}\times 0.1(\cos 90-\cos 0)}{0.1}=0.2\ V\]


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