Answered: A copper wire has a square cross…

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.

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.

Question

Part B
Find the magnitude of the electric field in the wire.
Express your answer in volts per meter.
ν Αφ
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 in seconds.
?
t =
S

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.
?
a
xa
|X|
X•10n
J =
A/m2
Submit
Previous Answers Request Answer
X Incorrect; Try Again; 5 attempts remaining
Part B
Find the magnitude of the electric field in the wire.
Express your answer in volts per meter.

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