How long does it take electrons to get from a car battery to

How long does it take electrons to get from a car battery to the starting motor? Assume the current is 260 A and the electrons travel through a copper wire with cross-sectional area 0.240 cm2 and length 0.890 m. The number of charge carriers per unit volume is 8.49 times 10^28 m^-3. Number Unit

Solution

Here ,

I = 260 A

A = 0.24 cm^2

L = 0.890 m

n = 8.49 *10^28 m^-3

drift speed , v = I/( n * A * e)

v = 260/(8.49 *10^28 * 0.24 *10^-4 * 1.602 *10^-19)

v = 0.0007965 m/s

time taken to travel = distance/time

time taken to travel = 0.790/(0.0007965)

time taken to travel = 991.83 s

the time taken for electron to travel from one end to other is 991.83 s