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megr_ftw
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Homework Statement
The starter motor of a car engine draws a current of 140 A from the battery. The copper wire to the motor is 5.0 mm in diameter and 1.2 m long. The starter motor runs for 0.95 s until the car engine starts.
How far does an electron travel along the wire while the starter motor is on?
Homework Equations
drift velocity= (j) / (en)
j= current density, e=elementary charge, n=concentration of gases in material(given in book)
j= I/A
The Attempt at a Solution
I found the charge that passes through the starter motor to be 133 Coulombs. Am I suppose to incorporate the equation for drift velocity in order to find the distance?