copper wire has a square cross section 2.9 mm on a side. he wire is 4.1 m long and carries a current of 3.7 A. The ensity of free electrons is 8.5 x 1028 m -3 Part A Find the magnitude of the current density in the wire. Express your answer in amperes per square meter. ? J = A/m2

copper wire has a square cross section 2.9 mm on a side. he wire is 4.1 m long and carries a current of 3.7 A. The ensity of free electrons is 8.5 x 1028 m -3 Part A Find the magnitude of the current density in the wire. Express your answer in amperes per square meter. ? J = A/m2

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

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

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A copper wire has a square cross section 2.9 mm on a side.
The wire is 4.1 m long and carries a current of 3.7 A. The
density of free electrons is 8.5 x 1028 m-3.
Part A
Find the magnitude of the current density in the wire.
Express your answer in amperes per square meter.
ΑΣφ
?
J =
A/m?

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