Please explain this! Especially the whole part of drift velocity The current in

Question

Please explain this! Especially the whole part of drift velocity

The current in an electron beam in a cathode-ray tube is measured to be 70 mu A. How many electrons hit the screen in 5.0 s? {e = 1.6 x 10-19 C) 2.2 x 10u electrons. 8.8 x 1013 electrons. 2.2 x 1015 electrons. 8.8 x I018 electrons. A wire carries a steady current of 0.1 A over a period of 20 s. What total charge passes through the wire in this time interval? In a certain material there is a current of 16 A flowing through a surface to the right, and there is an equal amount of positive and negative charge passing through the surface producing the current. How much negative charge passes through the surface? 8 C/s toward the right. 8 C/s toward the left. 16 C/s toward the right. 16 C/s toward the left. 17.2 A Microscopic View: Current and Drift Speed If the current in a wire is tripled, what effect does this have on the electron drift velocity in the wire? It stays the same. It triples. It decreases by a factor of three. It increases by a factor of nine. Wire A and Wire B are each carrying the same current. If the diameter of Wire A is twice that of Wire B, how does the drift velocity vdA in Wire A compare to that in in Wire B?

Explanation / Answer

a)

Q=it =70*10^-6*5 =3.5*10^-4 C

Number of electronsN =I/e =3.5*10^-4/1.6*10^-19

N =2.2*10^15 electrons

b)

Q=It =0.1*20 =2C

3)

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