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https://session.masteringphysics.com/myct/itemView?assignmentProblem!D-89297340&offset-prev; Part A The starter motor of a car engine draws a current of 190 A from the battery. The copper wire to the motor is 6.00 mim in diameter and 1.2 m long. The starter motor runs for 0.760 s until the car engine starts. How much charge passes through the starter motor? Express your answer with the appropriate units. alue Units Submit Part B How far does an electron travel along the wire while the starter motor is on? Express your answer with the appropriate units. ? Value Units Submit 2 Provide Feedback Next >Explanation / Answer
(A)
I = Q / t
Q = I t = 190 x 0.760 = 144.4 C .........Ans
(B) drift velocity, Vd = I / (n A q )
for copper, free electron density = 8.49 x 10^28 e/m^2
Vd = (190) / (8.49 x 10^28 x pix (3 x 10^-3)^2 x 1.6 x 10^-19)
Vd = 4.95 x 10^-4 m/s
distance travelled = Vd t = 3.76 x 10^-4 m .........Ans
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