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10th Class Science Electricity and Circuits Question Bank Electricity

  • question_answer
    A current of 5 amperes is passing through a metallic wire of cross-sectional area\[\text{4 }\times \text{ 1}{{0}^{-\text{6}}}\text{ }{{\text{m}}^{\text{2}}}\]. If the density of the charge carrier in the wire is \[5\times {{10}^{26}}/{{m}^{3}},\] the drift velocity of the electrons is

    A)  \[\frac{1}{8}m/s\]           

    B)         \[\frac{1}{16}m/s\]

    C)  \[\frac{1}{64}m/s\]         

    D)          \[\frac{1}{64}m/s\]

    Correct Answer: C

    Solution :

     Drift velocity,\[{{v}_{d}}=-\frac{i}{neA}\] \[=\frac{5}{(5\times {{10}^{26}})\times (1.6\times {{10}^{-29}})\times (4\times {{10}^{-6}})}=\frac{1}{64}m/s\]


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