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by: Mrs. Linda Wiegand


Marketplace > University of Florida > Physics 2 > PHY 6346 > ELECTROMAG THEORY 1
Mrs. Linda Wiegand
GPA 3.69

James Fry

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James Fry
Class Notes
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This 2 page Class Notes was uploaded by Mrs. Linda Wiegand on Friday September 18, 2015. The Class Notes belongs to PHY 6346 at University of Florida taught by James Fry in Fall. Since its upload, it has received 18 views. For similar materials see /class/206762/phy-6346-university-of-florida in Physics 2 at University of Florida.




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Date Created: 09/18/15
Chapter 11 Basic Magnetism There are no free magnetic charges in our part of the universe The sources of magnetic elds down to the atomic scale are electrical currents A small current loop appears from a distance as a magnetic dipole Thus orbiting electrons give to an atom a magnetic dipole moment associated with its orbital angular momentum In addition subatomic particles also have magnetic dipole moments The magnetic dipole moment of a nucleus comes in part from the proton currents within it and the magnetic dipole moment of a proton and other baryons and mesons comes in part from quark currents within it In addition the electron and the up and down quarks also have an intrinsic magnetic moment associated with their spin although they are supposed to be point like the heavier leptons and quarks have one too In a naive classical picture the electron continually goes in circles around itself The Dirac equation endows the electron with a spin S h and a magnetic moment MB ehch Both arise from quantum relativistic effects that are built into Dirac7s theory Beyond that quantum electrodynamics predicts that the intrinsic magnetic moment of the electron is actually M 100116 MB in stunning agreement with experiment Generally the magnetic dipole moments of elementary particles are understood much better than their masses To begin with we discuss the magnetic eld associated with steady currents and we also postulate the existence of point like magnetic dipoles that are of pure quantum origin The orbital dipoles actually have atomic or nuclear sizes and can be described classically as tiny current loops except that the associated angular momentum is quantized in units of h The intrinsic moments of elementary particles may be truly point like and can only be understood in a relativistic quantum theory 111 Steady currents The current density J is related to the charge density p by the continuity equation 5 EVJ70 111


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