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NEET Sample Paper NEET Sample Test Paper-72

  • question_answer
    Some magnetic flux is changed from a coil of resistance 10 ohm. As a result an induced current is developed in it, which varies with time as shown in the figure. The magnitude of change in flux through the coil in webers is  

    A) 2                                 

    B) 4

    C) 6                                 

    D) None of these

    Correct Answer: A

    Solution :

    \[\left| dq \right|=\frac{d\phi }{R}=idt=Area\,\,under\,\,i-t\,\,graph\] \[\therefore \,\,\,\,\,\,d\phi \,\,=\left( Area under\,\,i -t\,\,graph \right)R\] \[=\frac{1}{2}\times 4\times 0.1\times (10)=2\,Wb\]


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