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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Motional EMI

  • question_answer
    One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant sped v then the emf induced in the circuit in terms of B, l and v where l is the width of each tube, will be   [AIEEE 2005]

    A)             Zero                                          

    B)             \[2\,Blv\]

    C)             \[Blv\]                                      

    D)             \[-Blv\]

    Correct Answer: B

    Solution :

                Two emf's induces in the closed circuit each of value \[Bl\,v\]. These two emf's are additive. So \[{{E}_{\text{net}}}=2Bl\,v\].


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