An automobile starter motor is an electric motor used to start the gasoline engi

Question

An automobile starter motor is an electric motor used to start the gasoline engine. To operate the starter motor, the ignition switch is turned on, and a current of 55 A is supplied through a 1.9 mm radius copper wire that connects the motor to the automobile battery. (The density of free electrons of copper is 8.50 x 1028/m3.)


(a) If electric charge had to travel the 0.52 m distance from the battery to the motor before the motor would operate, how long would it take?


(b) How far do the electrons move in the 2.2 s required to start the engine?

Explanation / Answer

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