Save Question 3 (1 point) The resistivity of go is244 1080-m at a temperature of

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Save Question 3 (1 point) The resistivity of go is244 1080-m at a temperature of 20°C. A gold wire, 0 5 mm in diameter and 44 cm long carries a current of 380 ma. The number of electrons per second passing a given cross section of the wire, is closest to O A) 1.2 1022 B) 28 1014 o C) 24 101 O D) 24 101 E)63 1015 Save Question 4 (1 point) How much curen will be flowing through a 570 m length of copper wire with radius 5.7 mm #fit is connected to a source supplying 620 V? (The resistivity of copper is 168-INC-m) O A) 190 nA B) 3900 A C) 37 108 A O D) 6600 A Save Question 5 (1 point)

Explanation / Answer

3)

Current (I)= Average Charge Passing through a given cross-section per second.

But average charge passing per second (Q)= Number of Charged Particles passing per second (N)* Charge of each particle(e).

In this case, the charged particles passing are electrons. The charge on single electron (e) is 1.6* 10^(-19).

So, I=N×e

=>N=I/e = (380×10^3)/(1.6×10^19)

= 2.37×10^18 = 2.4 x 10^18 (option D)

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