Answered: A copper wire of 20 m long has a…

A copper wire of 20 m long has a potential difference of 68 V between its ends. What is the current density (in A/m²) in the wire? (pcu=1.7x108 2.m)

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 31P: Consider a wire of a circular cross-section with a radius of R = 3.00mm. The magnitude of 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.

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A copper wire of 20 m long has a potential difference of 68 V between its ends. What is
the current density (in A/m²) in the wire? (pcu=1.7x108 2.m)

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