Current Electricity

Question: A copper wire has a square cross-section, $2.0 mm$ on a side. It carries a current of $8 A$ and the density of free electrons is $8\times 10^{28} m^{-3}$. The drift speed of electrons is equal to

1) $0.156 \times 10^{-3} m/s$

2) $0.156 \times 10^{-2} m/s$

3) $3.12 \times 10^{-3} m/s$

4) $3.12 \times 10^{-2} m/s$

Solution:

Explanation: No Explanation

Electric Conduction Ohm's Law Resistance

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