The resistivity of gold is 2.44\times 10-8 ?\times m at a temperature of 20°C. Agold wire, 0.5 mm in diameter and 44 cm long, carries a current of380

Trent Carpenter

Trent Carpenter

Answered question

2021-02-02

The resistivity of gold is 2.44×108?×m at a temperature of 20C. Agold 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 crosssection of the wire, is closest to:
a. 2.4×1018
b. 2.8×1014
c. 1.2×1022
d. 2.4×1017
e. 6.3×1015

Answer & Explanation

Bentley Leach

Bentley Leach

Skilled2021-02-03Added 109 answers

Considering resistance is  =2.44×108?×m
Length(L)=0.44m radius(R)=(D2)=0.25 mm=0.25×103m
The resistance equation, which we are aware of, is R=?LA=5.47×102?
Given I=0.380A
Knowing the equation is I=qt=et =Ite=2.4×10

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