Problem 27.47 Part A The starter motor of a car engine draws a current of 150 A

Question

Problem 27.47 Part A The starter motor of a car engine draws a current of 150 A from the tattery I hropper wire to the motor is 4 30 mm in diameter and 1 2 m long. The starter motor runs tor 9r s until the car engine starts How much charge passes through the starter motor? Express your answer with the appropriate units. 146 C Submit My Answers Give Up Correct Part B How lar does an electroi ravel alorig the wire while the slarler molor is on? Express your answer with the appropriate units. 00084196 m Submit My Answers Give Up Incorrect; Try Again; 4 attempts remaining

Explanation / Answer

b] Given,

The radius of the conductor is 2.15 mm, or .00215m

The area of the conductor, A

A = pi*r^2

= pi*(.00215)^2 = 14.5*10^-6 m^2

The current density is:

J = 150/(14.5*10^-6) = 10.34*10^6 A/m

According to the listed reference:

Vd = J/(n*e)

= 10.34*10^6 / ( 8.46*10^28 * 1.6*10^-19 )

= 764*10^-6 m/s

= .764 mm/s

The distance traveled is:

x = v*t

= 0.764 * 0.97

= 0.44 mm answer

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