JEE Main & Advanced JEE Main Paper (Held On 15 April 2018) Slot-II

  • question_answer
    A copper rod of cross-sectional area \[A\] carries a uniform current \[I\] through if. At temperature \[T\], if the volume charge density of the rod is \[\rho \], how long will the charges take to travel a distance \[d\]?   [JEE Online 15-04-2018 (II)]

    A) \[\frac{2\rho dA}{IT}\]                  

    B) \[\frac{2\rho dA}{I}\]    

    C) \[\frac{\rho dA}{I}\]      

    D)          \[\frac{\rho dA}{IT}\]

    Correct Answer: C

    Solution :

    \[\rho =\frac{q}{vol}\] \[=\frac{q}{Ad}\] \[q=\rho Ad\] \[q=it\] \[t=\frac{q}{I}\] \[=\frac{\rho Ad}{I}\]


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