A A 35 1 M Length Of Copper Wire At 20 0 C Has A Radius Of 0 31 Mm Ita Potential Difference Of 1 00 Vis Applied Acros 1 (30.08 KiB) Viewed 49 times
A A 35 1 M Length Of Copper Wire At 20 0 C Has A Radius Of 0 31 Mm Ita Potential Difference Of 1 00 Vis Applied Acros 2 (23.59 KiB) Viewed 49 times
(a) A 35.1-m length of copper wire at 20.0*C has a radius of 0.31 mm. Ita potential difference of 1.00 Vis applied across the length of the wire, determine the current in the wire. (Uter the following table.) Material Resistivity (m) Temperature Coefficient of Resistivity" ["C)- Silver 1.59 x 10-* Copper 1.7x10-6 3.9 x 10-7 Gold 2.44 x 10-6 3.4*10- Aluminum 2.82 x 10-5 3.9x10- Tungsten 5.6 x 10- Iron 100 x 10 4510 5.0 x 10- 3.9210-3 29x10 Platinum Lead 22 10- Nichrome 1.00 x 10-6 0.410-> Carbon -0.5 10-> 35x10-5 10
Silicon -- 75 x 10 2.3 x 10 1010-1014 Glass Hard rubber -1013 Sulfur 1015 Quartz (fused) 75 x 2016 (a) All values at 20°C. All elements in this table are assumed to be free of impurities (b) See the section Resistance and Temperature (c) A nickel-chromium alloy commonly used in heating elements. The resistivity of Nichrome varies with composition and ranges between 1.00 10 and 1.50X10-90 m. (d) The resistivity of silicon is very sensitive to purity. The value can be changed by several orders of magnitude when it is doped with other stoms (b) If the wine is heated to 36.0°C while the 8.00-V potential difference is maintained, what is the resulting current in the wire?
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