The magnetic force −×evBGGmust point toward the center of the circular path. If the magnetic field is directed out of the page (defined to be +z direction), the electron will travel counterclockwise around the circle. Since the electron is negative, the current is in the opposite direction, clockwise and, by the right-hand rule for dipole moments, the dipole moment is into the page, or in the –zdirection. That is, the dipole moment is directed opposite to the magnetic field vector. (b) We note that the charge canceled in the derivation of µ= Ke/B. Thus, the relation = Ki/Bholds for a positive ion. (c) The direction of the dipole moment is –z, opposite to the magnetic field. (d) The magnetization is given by M = ene+ ini, where eis the dipole moment of an electron, neis the electron concentration, iis the dipole moment of an ion, and
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.