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NEET Sample Paper NEET Sample Test Paper-86

  • question_answer
    In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency\[\omega \]in a magnetic field B. The maximum value of emf generated in the coil is

    A) N A B R\[\omega \]        

    B)        N A B

    C) N A B R

    D)        N A B\[\omega \]

    Correct Answer: D

    Solution :

    [d] \[e=-\frac{d\phi }{dt}=-\frac{d(N\overrightarrow{B}.\overrightarrow{A})}{dt}\] \[=-N\frac{d}{dt}(BA\,\,\cos \,\omega t)=NBA\omega \,\,\sin \omega t\] \[\Rightarrow \]\[{{e}_{\max }}=NBA\omega \]


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