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

  • question_answer
    The magnetic flux linked with a coil at any instant is given by \[\phi =(5{{t}^{3}}-50t+200)Wb\]. The magnitude of emf induced in the coil at t = 2s is:                       

    A) 40 V                

    B) 140 V   

    C) 10 V                            

    D) 300 V       

    Correct Answer: C

    Solution :

    (c) 10 V Here, \[\phi =5{{t}^{3}}-50t+200\] and \[t=2s\] We know that. induced emf             \[\varepsilon =\left| \frac{-d\phi }{dt} \right|=15{{t}^{2}}-50\] \[{{\left| \frac{-d\phi }{dt} \right|}_{t=2}}=15{{(2)}^{2}}-50=60-50=10\,V\]


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