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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Faraday's and Lenz's Law

  • question_answer
    Magnetic flux f (in weber) linked with a closed circuit of resistance 10 ohm varies with time t (in seconds) as                          \[\varphi =5{{t}^{2}}-4t+1\] The induced electromotive force in the circuit at t = 0.2 sec. is                                                     [MP PMT 2001]

    A)            0.4 volts                                 

    B)            ? 0.4 volts

    C)            ? 2.0 volts                              

    D)            2.0 volts

    Correct Answer: D

    Solution :

               \[e=-\frac{d\varphi }{dt}=-(10t-4)\] Þ \[{{(e)}_{t=2}}=-(10\times 0.2-4)=2\ volt\]


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