Question

If a circuit is a 20 feet long wire in your automobile , approximately how long would it take an electron to travel from negative terminal to positive terminal of the battery?
​

Answer 1

Answer:

If a circuit is a 20 feet long wire in your automobile , approximately how long would it take an electron to travel from negative terminal to positive terminal of the battery?

Answer 2

Your complete question is shown in figure.

Given info : A 2 A current flows in a conductor which has 1 × 10²⁴ electron/meter.

a circuit is a 20 feet long wire in your automobile.

To find : how long would it take an electron to travel from negative to positive terminal of the battery ?

solution : drift velocity, vd = i/neA

here nA = no of electrons per meter = 1 × 10²⁴ /m

current, I = 2A

charge on electron = 1.6 × 10^-19 C

so, vd = 2/(10²⁴ × 1.6 × 10^-19)

= 1.25 × 10¯⁵ m/s

now time = distance/speed

here distance = 20 feet = 20 × 0.3048 m = 6.096 m

speed = vd = 1.25 × 10¯⁵ m/s

so time = 6.096/1.25 × 10¯⁵ sec

= 4.8768 × 10⁵ sec

= 135.47 hrs

Therefore 135.47 hrs would it take an electron to travel negative to positive terminal of the battery.