An iron wire is used to determine the melting point of material X. The resistance of the iron wire is 3.5 N at 30°C and increases to 5.5 N as material X starts to melt. What is the melting point of material X? [The temperature coefficient of resistivity for iron is 6.4 x 103 /C°] a. 157°C

An iron wire is used to determine the melting point of material X. The resistance of the iron wire is 3.5 N at 30°C and increases to 5.5 N as material X starts to melt. What is the melting point of material X? [The temperature coefficient of resistivity for iron is 6.4 x 103 /C°] a. 157°C

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 42P: What current flows through a 2.54-cm-diameter rod of Pure silicon that is 20.0 cm long, when 1.00103...

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

Question

An iron wire is used to determine the melting point of material X. The resistance of the
iron wire is 3.5 N at 30°C and increases to 5.5 N as material X starts to melt. What is
the melting point of material X?
[The temperature coefficient of resistivity for iron is 6.4 × 10-3 /C°]
a. 157°C
b. 119°C
c. 100°C
d. 27°C

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