A copper wire has a square cross section 2.3 mm on a side. Thewire is 3.7 m long and carries a current of 4.0 A. The density offree electrons is 8.5 x 1028 m-3. Part AFind the magnitude of the current density in the wire.Express your answer using two significant figures.?J =A/m2SubmitRequest AnswerPart BFind the magnitude of the electric field in the wire.Express your answer using two significant figures.E-V/mSubmitRequest AnswerPart CHow much time is required for an electron to travel the length of the wire?Express your answer using two significant figures.ΑΣΦt =SubmitBequest Answer

GIVEN Current = 4 Amp Length of the side if square L = 2.3 mm = 2.3 x 10-3 M Density of the free…

Answered: A copper wire has a square cross…

A copper wire has a square cross section 2.3 mm on a side. The wire is 3.7 m long and carries a current of 4.0 A. The density of free electrons is 8.5 x 1028 m-3.

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

A copper wire has a square cross section 2.3 mm on a side. The
wire is 3.7 m long and carries a current of 4.0 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 using two significant figures.
?
J =
A/m2
Submit
Request Answer
Part B
Find the magnitude of the electric field in the wire.
Express your answer using two significant figures.
E-
V/m
Submit
Request Answer
Part C
How much time is required for an electron to travel the length of the wire?
Express your answer using two significant figures.
ΑΣΦ
t =
Submit
Bequest Answer

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