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

  • question_answer
    A graph between induced current and time is shown below, for a coil of resistance \[5\,\Omega \], when it is kept in a changing magnetic flux. The magnitude of change in flux through the coil (in weber) is:

    A) 6 Wb                

    B) 3 Wb  

    C) 4 Wb                            

    D) 2 Wb      

    Correct Answer: B

    Solution :

    (b) 3 Wb                                       The change in flux is given by,             \[dq=\frac{d\phi }{dt}\] \[\Rightarrow d\phi =dq\times dt\]             \[=(area\,\,of\,\,l-t\,\,graph)\times R\]             \[=\left( \frac{1}{2}\times 0.2\times 6 \right)\times 5=0.6\times 5=3\,Wb\]


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