A 4.0 m length of gold wire is connected to a 1.5 V battery, and a current of 4.0 mA flows through it. How do you determine what is the diameter of the wire? (The resistivity of gold is 2.24 ⋅ 10-8 Ω m.)

A 4.0 m length of gold wire is connected to a 1.5 V battery, and a current of 4.0 mA flows through it. How do you determine what is the diameter of the wire? (The resistivity of gold is 2.24 ⋅ 10-8 Ω m.)

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 67PQ

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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.

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