Answer 1 and 2. Handwritten March 31, 2022 at 10:19 AM1. An unknown alloy is subjected to an electric field of 25 V/m, and has a current density of 1.45 X 10 9 A/m2.What is the metal's resistivity?2. A copper-nickel alloy called constantan has a resistance of 8.55 X 10 4 mQ at 20.0 °C. What is its resistanceif it is subjected to a temperature of 1500.0 °C? Assume that Equation for resistance is applicable at veryhigh temperature change.3. The temperature dependence of metal makes it possible for it to be used as a resistance thermometer, whichinvolves platinum. Platinum has a resistance of 50.0 0 at 20.0 °C. When it is immersed in a melting metalindium, its resistance increases to 7.68 X 10 4 mn. What is the melting point of indium in Kelvin?

Please note : As per answering guidelines I can answer the first question only. Since, this is not a…

Answered: 1. An unknown alloy is subjected to an…

1. An unknown alloy is subjected to an electric field of 25 V/m, and has a current density of 1.45 X 10 9 A/m2. What is the metal's resistivity?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 28P: An aluminum wire 1.628 mm in diameter (14-gauge) carries a current of 3.00 amps, (a) What is the...

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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.

Question

Answer 1 and 2. Handwritten

March 31, 2022 at 10:19 AM
1. An unknown alloy is subjected to an electric field of 25 V/m, and has a current density of 1.45 X 10 9 A/m2.
What is the metal's resistivity?
2. A copper-nickel alloy called constantan has a resistance of 8.55 X 10 4 mQ at 20.0 °C. What is its resistance
if it is subjected to a temperature of 1500.0 °C? Assume that Equation for resistance is applicable at very
high temperature change.
3. The temperature dependence of metal makes it possible for it to be used as a resistance thermometer, which
involves platinum. Platinum has a resistance of 50.0 0 at 20.0 °C. When it is immersed in a melting metal
indium, its resistance increases to 7.68 X 10 4 mn. What is the melting point of indium in Kelvin?

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