2- A copper wire of 3mm diameter with conductivity of 6.7 * 107 (0.m)1, and electron mobility of 0.0064 m? V sec. Is subjected to an electric field of 30 mV/m. Find (a) the charge density of free electrons, (b) the current density, (c) current flowing in the wire, (d) the electron draft velocity.

2- A copper wire of 3mm diameter with conductivity of 6.7 * 107 (0.m)1, and electron mobility of 0.0064 m? V sec. Is subjected to an electric field of 30 mV/m. Find (a) the charge density of free electrons, (b) the current density, (c) current flowing in the wire, (d) the electron draft velocity.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter30: Magnetic Fields And Forces

Section30.3: Ørsted’s Discovery

Problem 30.2CE

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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.

Question

2- A copper wire of 3mm diameter with conductivity of 6.7 * 107 (Q.m)1 , and
electron mobility of 0.0064 m2 N sec. Is subjected to an electric field of 30
mV/m.
Find (a) the charge density of free electrons,
(b) the current density,
(c) current flowing in the wire,
(d) the electron draft velocity.

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