26.12 (a) A 34.6-m length of copper wire at 20.0°C has a radius of 0.28 mm. If a potential difference of 7.50 V isapplied across the length of the wire, determine the current in the wire.(b) If the wire is heated to 31.0°C while the 7.50-V potential difference is maintained, what is the resultingcurrent in the wire?Step 1(a) From the table below, the resistivity of copper at 20.0°C is Pcucoefficient of resistivity Cuhave R =pL/A. Therefore, the resistance Ro of the copper wire at To=Ro=PcuA=PCu²πr²-81.7 x 10 m with temperature3.9 x 10-3 (°C)-¹. From the general relation between resistance and resistivity, we20.0°C is given by the following.(1.7 x1.7 x 10-8 mJU 0.28m)( 34.634.6 m0.28 x 10-3 m2=2.382.39| Ω. Step 2When a 7.50-V potential difference is applied across the length of this wire at 20.0°C, the resulting current IoisIoI ==AVRoIIAVR7.50Step 3=(b) At T = 31.0°C, the res tance is given by Rresistivity. The current in the copper wire becomes2.392.397.5 V2.39| ΩAVRo[1 + acu(T - To)]A.3.137.53.14 A.Ro[1 + a(TTO)], where a is the temperature coefficient ofv)Ω 1 + (3.9 x 10-³ (°C)-¹)(31.0Your response differs from the correct answer by more than 100%.°

Answered: Image /qna-images/answer/a4f1720c-4ea2-44f0-81b9-1e7962cd02db.jpg

(b) At T = 31.0°C, the resistance is given by R = Ro[1 + a(T-To)], where a is the temperature coefficient of resistivity. The current in the copper wire becomes AV Ro[1 + acu(T-To)] I = = AV R = 2.39 M)1 + (3.9 × 10-³ (°C)-¹)( 31.0 Your response differs from the correct answer by more than 100%. °C 7.5 A.

(b) At T = 31.0°C, the resistance is given by R = Ro[1 + a(T-To)], where a is the temperature coefficient of resistivity. The current in the copper wire becomes AV Ro[1 + acu(T-To)] I = = AV R = 2.39 M)1 + (3.9 × 10-³ (°C)-¹)( 31.0 Your response differs from the correct answer by more than 100%. °C 7.5 A.

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)...

See similar textbooks

Similar questions

23. A car traveling on a flat (unbanked), circular track w accelerates uniformly from rest with a tangential accel- eration of 1.70 m/s². The car makes it one-quarter of the way around the circle before it skids off the track. From these data, determine the coefficient of static friction between the car and the track.
5) 238 92 234 90
The ammeter shown in the figure below reads 1.69 A. Find 1,, I,, and &. (Assumne R = 6.90 2.) RI BIINIBI
z= 125 y= 22.48
answer 1
73. Ax B = B x A True False 74. R = EF True False
15.13
Please Answer Thank You.
I need help with all 4 blanks please.
Please help me answer asap.
3.1.10
6.3.12