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NEET Sample Paper NEET Sample Test Paper-90

  • question_answer
    Magnetic flux \[\phi \] in weber in a closed circuit of resistance 10W varies with time t (sec) as \[\phi =6{{t}^{2}}-5t+1.\] The magnitude of induced current at t = 0.25s is

    A) 0.2 A

    B)                    0.6 A

    C) 1.2 A   

    D)         0.8 A

    Correct Answer: A

    Solution :

    [a] \[e=\frac{-d\phi }{dt}=\frac{-d}{dt}\left( 6{{t}^{2}}-5t+1 \right)=-12t+5\] \[e=-12(0.25)+5=2\,volt\] \[i=\frac{e}{R}=\frac{2}{10}=0.2A.\]


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