2. A copper wire of diameter 0.86 mm carries a constant current of 0. 18 A to a 40 W bulb. The free-electron density in the wire is 6.3 x 10²8 per cubic meter. Find (a) the current density and (b) the drift speed.

2. A copper wire of diameter 0.86 mm carries a constant current of 0. 18 A to a 40 W bulb. The free-electron density in the wire is 6.3 x 10²8 per cubic meter. Find (a) the current density and (b) the drift speed.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section: Chapter Questions

Problem 58AP

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

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2. A copper wire of diameter 0.86 mm carries a constant current of 0.18A to a 40 W bulb. The free-electron density in the wire is
6.3 x 1028 per cubic meter. Find (a) the current density and (b) the drift speed.

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