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JEE Main & Advanced Sample Paper JEE Main Sample Paper-18

  • question_answer
    In the circuit shown, the cell is ideal. The coil has an inductance of 4H and zero resistance. F is a fuse of zero resistance and will blow when the current through it reaches 5 A. The switch is closed at t = 0. The fuse will blow

    A)  almost at once                

    B)  after 2 s

    C)  after 5 s              

    D)  after 10 s

    Correct Answer: D

    Solution :

     \[\varepsilon =\frac{Ldi}{dt}\]\[\Rightarrow \]\[di=\frac{E}{L}dt\]\[\Rightarrow \]\[i=\frac{2}{4}t\] \[\therefore \] \[t=\frac{5\times 4}{2}=10\,s\]


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