A 1.70 m cylindrical rod of diameter 0.550 cm is connected to a power supply that maintains a constant potential difference of 12.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.3 A, while at 92.0° C it reads 17.2 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. Find the resistivity for the material of the rod at 20.0° C. Express your answer in ohm-meters. 17 ΑΣΦ p= Submit Part B Request Answer απ ? 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. -- ΑΣΦ A] Ω· m ? (°C) -¹

A 1.70 m cylindrical rod of diameter 0.550 cm is connected to a power supply that maintains a constant potential difference of 12.0 V across its ends, while an ammeter measures the current through it. You observe that at room temperature (20.0°C) the ammeter reads 18.3 A, while at 92.0° C it reads 17.2 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. Find the resistivity for the material of the rod at 20.0° C. Express your answer in ohm-meters. 17 ΑΣΦ p= Submit Part B Request Answer απ ? 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. -- ΑΣΦ A] Ω· m ? (°C) -¹

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 55P: A 20.00-V battery is used to supply current to a 10-k resistor. Assume the voltage drop across any...

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