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AMU Medical AMU Solved Paper-1997

  • question_answer
    The instantaneous magnetic flux\[\phi \]in a circuit is \[\phi =4{{t}^{2}}-4t+1\]The total resistance of the circuit is \[10\,\Omega \]. At\[t=\frac{1}{2}s,\]the induced current in the circuit is

    A)  0                   

    B)  0.2 A

    C)  0.4 A              

    D)  0.8 A

    Correct Answer: A

    Solution :

    : Flux\[(\phi )=4{{t}^{2}}-4t+1\] \[\therefore \]\[\frac{d\phi }{dt}=8t-4\] At\[t=1/2,\] \[\frac{d\phi }{dt}=\frac{8}{2}-4=4-4=0\] \[\therefore \]Induced emf \[=0\] Hence induced current = zero.


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