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J & K CET Engineering J and K - CET Engineering Solved Paper-2012

  • question_answer
    Consider a copper wire of length L, cross-sectional area A. It has n number of free electrons per unit volume. Which of the following is the correct expression of drift velocity of the electrons when the wire carries a steady current I?

    A)  \[\frac{I}{neL}\]

    B)  \[\frac{I}{{{n}^{2}}eL}\]

    C)  \[\frac{I}{neA}\]

    D)  \[\frac{I}{n{{e}^{2}}LA}\]

    Correct Answer: C

    Solution :

    We have, \[I=neA{{v}_{d}}\] Drift velocity, \[{{v}_{d}}=\frac{I}{neA}\]


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