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NEET Sample Paper NEET Sample Test Paper-74

  • question_answer
    In an inductor, the current I varies with time t as\[\operatorname{I} =4+4\,t\]. If the emf induced in the inductor is 8 mV, what is self-inductance? (Here current is in ampere and time is in second)

    A)  \[8\times {{10}^{-6}}H\]                     

    B)  \[6\times {{10}^{-6}}H\]

    C)  \[4\times {{10}^{-3}}H\]                     

    D)  \[2\times {{10}^{-3}}H\]

    Correct Answer: D

    Solution :

    As,                    \[\left| e \right|=L\frac{dl}{dt}\]        \[8\times {{10}^{-3}}=L\frac{d(4+4\,\,t)}{dt}\] \[8\times 1{{0}^{-\,3}}=\,\,L\left( 4 \right)\] \[\operatorname{L}=2\times 1{{0}^{-}}^{3}H\]


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