Q6. A copper wire of length \( 2 \, \text{m} \) and cross-sectional area \( 2 \times 10^{-6} \, \text{m}^2 \) carries a current of \( 2 \, \text{A} \). If the number density of free electrons in copper is \( 8.5 \times 10^{28} \, \text{m}^{-3} \) and \( e = 1.6 \times 10^{-19} \, \text{C} \), what is the drift speed of the electrons?
- A. \( 5.0 \times 10^{-5} \, \text{m/s} \)
- B. \( 7.35 \times 10^{-5} \, \text{m/s} \)
- C. \( 8.0 \times 10^{-5} \, \text{m/s} \)
- D. \( 9.5 \times 10^{-5} \, \text{m/s} \)