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NEET Sample Paper NEET Sample Test Paper-5

  • question_answer
    The current in a wire varies with time according to the equation \[\text{l}=4+2t,\]where l is in ampere and t is in second. The quantity of charge which has passed through a cross section of the wire during the time \[t=2S\]to \[t=6S\] will be:

    A)  60 C              

    B)  24 C

    C)  48 C              

    D)  30 C

    Correct Answer: C

    Solution :

    Let dq be the charge which has passed in a small interval of time dt, then \[dq=1dt=(4+2t)\,dt.\] Hence, total charge passed between interval \[t=2s\] and \[t=6s\] \[q=\int_{2}^{6}{(4+2t)\,dt=48C}\]


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