The current density in a copper wire of diameter 1.02 mm is 1.75 x 10⁵ A/m². The number of free electrons per cubic meter of copper is 8.5 x 10²⁸. Find the (a) current in the wire and (b) magnitude of drift velocity of electron in the wire.

The current density in a copper wire of diameter 1.02 mm is 1.75 x 10⁵ A/m². The number of free electrons per cubic meter of copper is 8.5 x 10²⁸. Find the (a) current in the wire and (b) magnitude of drift velocity of electron in the wire.

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 65PQ

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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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