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  • A current of through a wire of cross-sectional area <img alt="25.0 mm^{2}" src="https://entrancecorner.oncodecogs.com/g

A current of 2 A through a wire of cross-sectional area 25.0 mm^{2} . The number of free electrons in a cubic meter are 2.0\times 10^{28}. The drift velocity of the electrons is ________ \times 10 ^{-6}ms^{-1}
(given, charge on electron = 1.6\times 10^{-19}C).

Option: 1

25


Option: 2

___


Option: 3

___


Option: 4

___


Answers (1)

best_answer

\begin{aligned} & \mathrm{I}=\text { neAV } \\ & V_d=\frac{I}{n e A} \Rightarrow V_d=\frac{2}{2 \times 10^{28} \times 1.6 \times 10^{-19} \times 25 \times 10^{-6}} \\ & V_d=25 \mathrm{~m} / \mathrm{s} \end{aligned}
 

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