(a) A 33.5-m length of copper wire at 20.0°C has a radius of 0.31 mm. If a potential difference of 7.0 V is applied across the length of the wire, determine the current in the wire. (Use the values in the following table.) (b) If the wire is heated to 32.0°C while the 7.0-V potential difference is maintained, what is the resulting current in the wire? ResistivityTemperature CoefficientMaterialof Resistivity [(°C)-1](u. U)Silver1.59 x 10-8-33.8 х 10--Copper1.7 x 10-83.9 х 10-3Gold2.44 x 10-83.4 x 10-3Aluminum2.82 x 10-8-33.9 х 10-Tungsten5.6 x 10-84.5 x 10-3Iron10.0 x 10-85.0 x 10-3Platinum11 x 10-83.92 x 10-3Lead22 x 10-8-33.9х 10--Nichromea150 x 10-80.4 x 10-3Carbon3.5 х 10-5-0.5 x 10-3Germanium0.46-48 x 10-3Silicon640-75 x 10-3Glass1010-1014Hard rubber21013Sulfur1015Quartz (fused)75 x 1016

(a) The resistance of the copper wire is, Substitute the values,

Answered: Resistivity Temperature Coefficient…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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(a) A 33.5-m length of copper wire at 20.0°C has a radius of 0.31 mm. If a potential difference of 7.0 V is applied across the length of the wire, determine the current in the wire. (Use the values in the following table.)

(b) If the wire is heated to 32.0°C while the 7.0-V potential difference is maintained, what is the resulting current in the wire?

Resistivity
Temperature Coefficient
Material
of Resistivity [(°C)-1]
(u. U)
Silver
1.59 x 10-8
-3
3.8 х 10--
Copper
1.7 x 10-8
3.9 х 10-3
Gold
2.44 x 10-8
3.4 x 10-3
Aluminum
2.82 x 10-8
-3
3.9 х 10-
Tungsten
5.6 x 10-8
4.5 x 10-3
Iron
10.0 x 10-8
5.0 x 10-3
Platinum
11 x 10-8
3.92 x 10-3
Lead
22 x 10-8
-3
3.9х 10--
Nichromea
150 x 10-8
0.4 x 10-3
Carbon
3.5 х 10-5
-0.5 x 10-3
Germanium
0.46
-48 x 10-3
Silicon
640
-75 x 10-3
Glass
1010-1014
Hard rubber
21013
Sulfur
1015
Quartz (fused)
75 x 1016

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