A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 39.5 Q at 20.0°C. If its resistance increases to 40.2 Q at 28.5°C, what is the temperature coefficient of resistivity? (°C)-1

A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 39.5 Q at 20.0°C. If its resistance increases to 40.2 Q at 28.5°C, what is the temperature coefficient of resistivity? (°C)-1

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 7P

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

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A wire 3.00 m long and 0.450 mm2 in cross-sectional
area has a resistance of 39.5 Q at 20.0°C. If its
resistance increases to 40.2 Q at 28.5°C, what is the
temperature coefficient of resistivity?
(°C)-1

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