An aluminum wire with a diameter of 0.125 mm has a uniform electric field of 0.215 V/m imposed along its entire length. The temperature of the wire is 45.0°C. Assume one free electron per atom. (a) Use the information in this Table of Resistivities and Temperature Coefficients to determine the resistivity (in 2· m) of aluminum at this temperature. (b) What is the current density (in MA/m²) in the wire? J = MA/m2 (c) What is the total current (in mA) in the wire? I = mA (d) What is the drift speed of the conduction electrons? um/s (e) What potential difference must exist between the ends of a 2.50 m length of the wire to produce the stated electric field? AV = V

An aluminum wire with a diameter of 0.125 mm has a uniform electric field of 0.215 V/m imposed along its entire length. The temperature of the wire is 45.0°C. Assume one free electron per atom. (a) Use the information in this Table of Resistivities and Temperature Coefficients to determine the resistivity (in 2· m) of aluminum at this temperature. (b) What is the current density (in MA/m²) in the wire? J = MA/m2 (c) What is the total current (in mA) in the wire? I = mA (d) What is the drift speed of the conduction electrons? um/s (e) What potential difference must exist between the ends of a 2.50 m length of the wire to produce the stated electric field? AV = V

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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