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NEET Sample Paper NEET Sample Test Paper-90

  • question_answer
    A square loop of side a is rotating about its diagonal with angular velocity co in a perpendicular magnetic field B. It has 10 turns. The emf induced is

    A) \[B\,\,{{a}^{2}}\omega \,\,\sin \,\,\omega t\]

    B)        \[B\,\,{{a}^{2}}\omega \,\,\cos \,\,\omega t\]

    C) \[5\,\,\sqrt{2}\,\,B\,\,{{a}^{2}}\]           

    D)         \[10\,B\,\,{{a}^{2}}\omega \,\,\sin \,\,\omega t\]

    Correct Answer: D

    Solution :

    [d] \[\phi =n\,\,BA\,\,\cos \theta =10\,B\,\,{{a}^{2}}\cos \,\omega t\] \[e=-\frac{d\phi }{dt}=-\frac{d}{dt}\left( 10\,B{{a}^{2}}\cos \,\omega t \right)=10\,B\,{{a}^{2}}\sin \,\omega t(\omega ).\]


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