What is the current in a wire of radius R = 2.01 mm if the magnitude of the current density is given by (a) Ja = Jor/R and (b) Jb = Jo(1 -r/R) in which r is the radial distance and Jo = 6.22 x 104 A/m2? (c) Which function maximizes the current density near the wire's surface?

What is the current in a wire of radius R = 2.01 mm if the magnitude of the current density is given by (a) Ja = Jor/R and (b) Jb = Jo(1 -r/R) in which r is the radial distance and Jo = 6.22 x 104 A/m2? (c) Which function maximizes the current density near the wire's surface?

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 6P: Figure P21.6 represents a section of a conductor of nonuniform diameter carrying a current of I =...

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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.

Question

What is the current in a wire of radius R = 2.01 mm if the magnitude of the current density is given by (a) Ja = Jor/R and (b) Jb = Jo(1 - r/R)
in which ris the radial distance and Jo = 6.22 x 104 A/m2? (c) Which function maximizes the current
density near the wire's surface?
(a) Number
Units
(b) Number
Units
(c)

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