a: A current of I=1 A flows through a very long straight wire. How far away from the wire does the magni- tude of the created magnetic field equal the magni- tude of earths magnetic field Bearth 5 x 10-5T. (Remember that the permeability of free space is Ha = 4n x 10-7Tm/A)

a: A current of I=1 A flows through a very long straight wire. How far away from the wire does the magni- tude of the created magnetic field equal the magni- tude of earths magnetic field Bearth 5 x 10-5T. (Remember that the permeability of free space is Ha = 4n x 10-7Tm/A)

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

Section: Chapter Questions

Problem 82PQ

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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

b: This can cancel the earth's magnetic field if the wire
is oriented appropriately .
1. at all points the distance computed in a away O
2. along a line parallel to the wire O
3. only at a single point O

a: A current of I =1 A flows through a very long straight
wire. How far away from the wire does the magni-
tude of the created magnetic field equal the magni-
tude of earths magnetic field Bearth 5 x 10-5T.
(Remember that the permeability of free space is
Ha = 4n x 10-7Tm/A)

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