1. The magnitude J of the current density in a certain wire with a circular crosssection of radius R = 0.0874 inch is given by J = (3.09 × 108)r², with J inamperes per square meter and radial distance r in meters. What is thecurrent through the outer section bounded by r = 0.911R andr = R?

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1. The magnitude J of the current density in a certain wire with a circular cross section of radius R = 0.0874 inch is given by J = (3.09 x 108)r2, with J in amperes per square meter and radial distance r in meters. What is the current through the outer section bounded by r = 0.911R and r = R?

1. The magnitude J of the current density in a certain wire with a circular cross section of radius R = 0.0874 inch is given by J = (3.09 x 108)r2, with J in amperes per square meter and radial distance r in meters. What is the current through the outer section bounded by r = 0.911R and r = R?

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 65PQ

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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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1. The magnitude J of the current density in a certain wire with a circular cross
section of radius R = 0.0874 inch is given by J = (3.09 × 108)r², with J in
amperes per square meter and radial distance r in meters. What is the
current through the outer section bounded by r = 0.911R andr = R?

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