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

  • question_answer
    If a coil of 40 turns and area 4.0 cm2 is suddenly removed from a magnetic field, it is observed that a charge of \[2.0\times {{10}^{-4}}C\] flows into the coil. If the resistance of the coil is \[80\Omega \], the magnetic flux density in \[Wb/{{m}^{2}}\] is                       [MP PET 2005]

    A)            0.5 

    B)            1.0 

    C)            1.5              

    D)            2.0

    Correct Answer: B

    Solution :

                       \[\Delta Q=\frac{\Delta \varphi }{R}=\frac{n\times BA}{R}\]            Þ \[B=\frac{\Delta Q.R}{nA}\]\[=\frac{2\times {{10}^{-4}}\times 80}{40\times 4\times {{10}^{-4}}}\]\[=1\ Wb/{{m}^{2}}\]


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