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12th Class Physics Electro Magnetic Induction Question Bank MCQ - Electromagnetic Induction

  • question_answer
    The phase different between the flux linked with a coil rotating in a uniform magnetic field and induced emf produced in it is:

    A) \[\frac{\pi }{4}\]                        

    B) \[\frac{\pi }{2}\]

    C) \[\frac{-\pi }{6}\]                                   

    D) \[\pi \]

    Correct Answer: B

    Solution :

    (b) \[\frac{\pi }{2}\] We know that flux linked with the coil             \[\phi =BA\,\,\cos \,\theta \] Induced emf, \[\varepsilon =-\frac{d\phi }{dt}=-\frac{d(BA\,cos\,\theta )}{dt}=BA\,\sin \,\theta \]             \[=BA\,\,\cos \left( \frac{\pi }{2}+\theta  \right)\] \[\therefore \]      Phase difference \[=\frac{\pi }{2}+\theta -\theta =\frac{\pi }{2}\]


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