Part A A 1.60 m cylindrical rod of diameter 0.450 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 18.7 A, while at 92.0°C it reads 17.0 A. You can ignore any thermal expansion of the rod. Find the resistivity for the material of the rod at 20.0° C. Express your answer in ohm-meters. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Temperature dependence of resistance. ? p = N- m Submit Previous Answers Request Answer X Incorrect; Try Again; 7 attempts remaining 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. ? a = (°C) 1 Submit Previous Answers Request Answer X Incorrect; Try Again; 8 attempts remaining
Part A A 1.60 m cylindrical rod of diameter 0.450 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 18.7 A, while at 92.0°C it reads 17.0 A. You can ignore any thermal expansion of the rod. Find the resistivity for the material of the rod at 20.0° C. Express your answer in ohm-meters. For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Temperature dependence of resistance. ? p = N- m Submit Previous Answers Request Answer X Incorrect; Try Again; 7 attempts remaining 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. ? a = (°C) 1 Submit Previous Answers Request Answer X Incorrect; Try Again; 8 attempts remaining
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Transcribed Image Text:Part A
A 1.60 m cylindrical rod of diameter 0.450 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 18.7 A. while at 92.0°C it reads 17.0 A. You can
Find the resistivity for the material of the rod at 20.0° C.
ignore any thermal expansion of the rod.
Express your answer in ohm-meters.
For related problemsolving tips and strategies, you may want to view a Video
Tutor Solution of Temperature dependence of resistance.
να ΑΣφ
N. m
Submit
Previous Answers Request Answer
X Incorrect; Try Again; 7 attempts remaining
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.
?
a =
(°C) 1
Submit
Previous Answers Request Answer
X Incorrect; Try Again; 8 attempts remaining
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