Consider a wire of length 4m and cross-sectional area

Question:

Consider a wire of length $4 \mathrm{~m}$ and cross-sectional area $1 \mathrm{~mm}^{2}$ carrying a current of $2 \mathrm{~A}$. If each cubic meter of the material contains $10^{29}$ free electrons, find the average time taken by an electron to cross the length of the wire.

Solution:

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