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# Problem: The starter motor of a car engine draws a current of 170 A from the battery. The copper wire to the motor is 5.80 mm in diameter and 1.2 m long. The starter motor runs for 0.670 s until the car engine starts.A)How much charge passes through the starter motor? (C)B)How far does an electron travel along the wire while the starter motor is on? (mm)

###### FREE Expert Solution

Charge:

$\overline{){\mathbf{Q}}{\mathbf{=}}{\mathbf{i}}{\mathbf{t}}}$

Current density:

$\overline{){\mathbf{J}}{\mathbf{=}}\frac{\mathbf{i}}{\mathbf{A}}}$

A)

Substituting the given values to the charge equation:

Q = (170)(0.670) = 113.9C

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###### Problem Details
The starter motor of a car engine draws a current of 170 A from the battery. The copper wire to the motor is 5.80 mm in diameter and 1.2 m long. The starter motor runs for 0.670 s until the car engine starts.

A)How much charge passes through the starter motor? (C)
B)How far does an electron travel along the wire while the starter motor is on? (mm)