Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 26, Problem 8Q
To determine

The reason for demagnetization to be an example of restoring a broken symmetry.

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If we were to analyze the magnetic flux lines of a current-carrying conductor, oriented perpendicularly to a magnetic field between two bar magnets, the interaction would look something like this: S N S N This interaction of magnetic flux lines (the bar magnets' straight lines versus the wire's cireles) will produce a mechanical force on the wire (called the Lorentz force). Which direction will this force act? Also, determine the direction of current through the conductor (seen from an end-view in the above illustration) necessary to produce the circular magnetic flux shown.
Consider a region where the electric field and the magnetic field are along the +x- and the -y-axes, respectively. If a certain charge is in the region, at what velocity should it move so that it will move in a uniform velocity? (To maintain a uniform velocity, the Lorentz force must be zero) Let E and B be the magnitudes of the electric field and of the magnetic field, respectively. B V = - - B E az V = E V = az 1>
Find the magnitude and direction of the Lorentz force on an individual charged particle as it moves through a magnetic field.  The direction of the velocity is given by the single, blue arrow pointing away from the charge.  The direction of the magnetic field is given by the multiple, black arrows.
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