A straight wire of radius a is aligned with the z axis and supports a current I. The magnetic field intensity inside the wire isIΣπα2Determine the current density in the wire.H=-台a. IO b. Ina2O c. IπαO d. Iπα(N

Current through wire is I. Radius of wire is a. Current density is given by J=CurrentArea

A straight wire of radius a is aligned with the 2 axis and supports a cur I Σπα2 H=- Determine the current density in the wire. O a. I πr O b. I ra2 OC. I πα The magnetic field intensity inside the wire is

A straight wire of radius a is aligned with the 2 axis and supports a cur I Σπα2 H=- Determine the current density in the wire. O a. I πr O b. I ra2 OC. I πα The magnetic field intensity inside the wire is

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter24: Magnetic Fields

Section: Chapter Questions

Problem 83A

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Concept explainers

Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.

Question

A straight wire of radius a is aligned with the z axis and supports a current I. The magnetic field intensity inside the wire is
I
Σπα2
Determine the current density in the wire.
H=-
台
a. I
O b. I
na2
O c. I
πα
O d. I
πα
(N

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