Answered: Starting from Ohm’s law, show that E =…

Starting from Ohm’s law, show that E = Jρ, where E is themagnitude of the electric field (assumed constant) and J = I/Ais called the current density. The result is in fact true in general.

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 68PQ

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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.

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Starting from Ohm’s law, show that E = Jρ, where E is the
magnitude of the electric field (assumed constant) and J = I/A
is called the current density. The result is in fact true in general.

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