A current of 126 mA exists in a wire for 5.60 minutes. What is the rate that cha

Question

A current of 126 mA exists in a wire for 5.60 minutes. What is the rate that charge passes a point in the wire? Give your answer in the form "a.bc x 10^(x)" C/s

Continuing the previous question, what is the rate of electrons passing through a cross section perpendicular to the wire's axis? Give your answer in the form "a.bc x 10^(x)" electrons/second.

assume that the charge moves in a straight line from one end of the wire to the other, how many electrons are moved through the cross section during 38.0 ms? Give your answer in the form "a.bc x 10^(x)" electrons

Explanation / Answer

a)
current is 126 mA= 1.26*10^-1 A

rate of charge passing is current

So rate is 1.26*10^-1 C/s

b)
rate of electron = rate of charge / charge on each electrom
= (1.26*10^-1) / (1.6*10^-19)
=7.88*10^17 electron/s

c)
time = 38 ms = 0.038 s

Number of electron = rate of electron flow * time
= 7.88*10^17 electron/s * 0.038 s
=3.00*10^16 electrons

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