The free-electron density in a copper wire is 8.5×10288.5×1028 electrons/m3electrons/m3. The electric field in the wire is 0.0660 N/CN/C and the temperature of the wire is 20.0∘C∘C. Use the resistivity at room temperature for copper is ρρ = 1.72×10−81.72×10−8 Ω⋅mΩ⋅m.

The free-electron density in a copper wire is 8.5×10288.5×1028 electrons/m3electrons/m3. The electric field in the wire is 0.0660 N/CN/C and the temperature of the wire is 20.0∘C∘C. Use the resistivity at room temperature for copper is ρρ = 1.72×10−81.72×10−8 Ω⋅mΩ⋅m.

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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What is the drift speed vdvd of the electrons in the wire?

What is the potential difference between two points in the wire that are separated by 25.0 cm?

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