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Correct IDENTIFY: First use Ohm's law to find the resistance at 20.0° C; then calculate the resistivity from the resistance. Finally use the dependence of resistance on temperature to calculate the temperature coefficient of resistance. SET UP: Ohm's law is R = V/I, R=pL/A, and the radius is one-half the diameter. EXECUTE: At 20.0°C, R = V/I= (13.0 V)/(18.4 A) = 0.707 2. Using R = pL/A and solving for p gives p=RA/L = RT(D/2)²/L = (0.707 )([(0.450 × 10-² m)/2]²/(1.30 m) = 8.64 × 10-6 N. m. ▾ Part B Find the temperature coefficient of resistivity at 20.0°C for the material of the rod. Express your answer in reciprocal degrees Celsius to two significant figures. 15. ΑΣΦ a= 9.780910 Qubmit Duerda pay ? (°C)-¹

Correct IDENTIFY: First use Ohm's law to find the resistance at 20.0° C; then calculate the resistivity from the resistance. Finally use the dependence of resistance on temperature to calculate the temperature coefficient of resistance. SET UP: Ohm's law is R = V/I, R=pL/A, and the radius is one-half the diameter. EXECUTE: At 20.0°C, R = V/I= (13.0 V)/(18.4 A) = 0.707 2. Using R = pL/A and solving for p gives p=RA/L = RT(D/2)²/L = (0.707 )([(0.450 × 10-² m)/2]²/(1.30 m) = 8.64 × 10-6 N. m. ▾ Part B Find the temperature coefficient of resistivity at 20.0°C for the material of the rod. Express your answer in reciprocal degrees Celsius to two significant figures. 15. ΑΣΦ a= 9.780910 Qubmit Duerda pay ? (°C)-¹

College Physics
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 1.30 m cylindrical rod of diameter 0.450 cm is connected to a power supply that maintains a constant potential difference of 13.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.4 A, while at 92.0°C it reads 17.0 A. You can ignore any thermal expansion of the rod. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Temperature dependence of resistance. Submit Correct IDENTIFY: First use Ohm's law to find the resistance at 20.0° C; then calculate the resistivity from the resistance. Finally use the dependence of resistance on temperature to calculate the temperature coefficient of resistance. SET UP: Ohm's law is R = V/I, R= pL/A, and the radius is one-half the diameter. EXECUTE: At 20.0°C, R = V/I = (13.0 V)/(18.4 A) = 0.707 №. Using R=pL/A and solving for p gives -6 p=RA/L= Rπ(D/2)² /L = (0.707 №)π([(0.450 × 10−² m)/2]²/(1.30 m) = 8.64 × 10¯6 № · m. Part B Previous Answers Find the temperature coefficient of resistivity at 20.0°C for the material of the rod. Express your answer in reciprocal degrees Celsius to two significant figures. IVE ΑΣΦ α= 9.7809 10 Submit 4 Previous Answers Request Answer ? X Incorrect; Try Again; One attempt remaining (°C) -¹
Transcribed Image Text:A 1.30 m cylindrical rod of diameter 0.450 cm is connected to a power supply that maintains a constant potential difference of 13.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.4 A, while at 92.0°C it reads 17.0 A. You can ignore any thermal expansion of the rod. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Temperature dependence of resistance. Submit Correct IDENTIFY: First use Ohm's law to find the resistance at 20.0° C; then calculate the resistivity from the resistance. Finally use the dependence of resistance on temperature to calculate the temperature coefficient of resistance. SET UP: Ohm's law is R = V/I, R= pL/A, and the radius is one-half the diameter. EXECUTE: At 20.0°C, R = V/I = (13.0 V)/(18.4 A) = 0.707 №. Using R=pL/A and solving for p gives -6 p=RA/L= Rπ(D/2)² /L = (0.707 №)π([(0.450 × 10−² m)/2]²/(1.30 m) = 8.64 × 10¯6 № · m. Part B Previous Answers Find the temperature coefficient of resistivity at 20.0°C for the material of the rod. Express your answer in reciprocal degrees Celsius to two significant figures. IVE ΑΣΦ α= 9.7809 10 Submit 4 Previous Answers Request Answer ? X Incorrect; Try Again; One attempt remaining (°C) -¹
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