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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Electric Conduction Ohms and Resistance

  • question_answer
    At room temperature, copper has free electron density of \[8.4\times {{10}^{28}}\] per \[{{m}^{3}}\].  The copper conductor has a cross-section of \[{{10}^{6}}{{m}^{2}}\]and carries a current of 5.4 A.  The electron drift velocity in copper is                                            [UPSEAT 2002]

    A)            400 m/s

    B)                                      0.4 m/s

    C)            0.4 m/s                                   

    D)            72 m/s

    Correct Answer: C

    Solution :

                 \[{{V}_{d}}=\frac{i}{nAe}=\frac{5.4}{8.4\times {{10}^{28}}\times {{10}^{-6}}\times 1.6\times {{10}^{-19}}}\] = \[0.4\times {{10}^{-3}}m/sec=0.4mm/sec\].


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