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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Self Evaluation Test - Electromagnetic Induction

  • question_answer
    In a coil of resistance 100 Q, a current is induced by changing the magnetic flux through it as shown in the figure. The magnitude of change in flux through the coil is      

    A) 250 Wb            

    B) 275 Wb  

    C) 200 Wb            

    D) 225 Wb               

    Correct Answer: A

    Solution :

    [a] According to Faraday's law of electromagnetic induction, \[\varepsilon =\frac{d\phi }{dt}\] Also,   \[\varepsilon =iR\]  \[\therefore \,\,\,\,iR=\frac{d\phi }{dt}\Rightarrow \int{d\phi =R\int{idt}}\] Magnitude of change in flux \[(d\phi )=R\times area\]under current vs time graph or   \[d\phi =100\times \frac{1}{2}\times \frac{1}{2}\times 10=250\,Wb\]


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