The current density in a copper wire of diameter 1.02 mm is 1.75x105 A/m2. The number of free electrons per cubic meter of copper is 8.5x1028. Find the (a) current in the wire and (b) magnitude of drift velocity of electrons in the wire

The current density in a copper wire of diameter 1.02 mm is 1.75x105 A/m2. The number of free electrons per cubic meter of copper is 8.5x1028. Find the (a) current in the wire and (b) magnitude of drift velocity of electrons in the wire

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 17P

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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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The current density in a copper wire of diameter 1.02 mm is 1.75x10⁵ A/m². The number of free electrons per cubic meter of copper is 8.5x10²⁸. Find the (a) current in the wire and (b) magnitude of drift velocity of electrons in the wire.

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