일반물리학 2 — Current and Resistance: Problem 43

43 How long does it take electrons to get from a car battery to the starting motor? Assume the current is 285 A and the electrons travel through a copper wire with cross-sectional area \(0.17 \text{ cm}^2\) and length \(0.43 \text{ m}\). The number of charge carriers per unit volume is \(8.49 \times 10^{28} \text{ m}^{-3}\).