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By M. I. Kaganov V. M. Tsukernik

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The energy of motion of a free particle is (1/2)mu2, anrl ils Hamiltonian function is p2/2m (p = m v i s the mo1nent11m: aqd v is the v ~ l o c i t y l . 88 Ch. 1. Elementary Magnets system consisting of two electrons (the very E , and E, mentioned above). is independent of the spin of the system and, as can readily be ascertained, represents the value of energy averaged over all possible spin states (three states with S = I and one state with S = 0); the second term is a function of the spin of the system.

2. Pararnagiietisln and Diamagnetism point, T x ( O, ( , is of substantial interest and will be discussed specially in this book after we explain why Curie's law holds a t T > 1 0, I and why departures from this law are observed at T x I @ , I . 4) + This immediately gives B = x H and x = 1 43%. Althougli the vector B is called the vector of magnetic induction, and H the vector of magnetic field, the true meaning of B is that B (and not H) is the mean magnetic field in a medium. Each atom is a microscopic source of a magnetic field, and over interatomic spacings the field in a medium varies from point to point.

Magnetic Susceptibility If a piece of some material is placed between the poles of a magnet, or inside a ~olenoidthrough which electric current is run, the magnetic lines of force are somewhat redistributed as compared Magnetic Susceptibility h3 lion of tlie body is the magnetic moment density Tlie dimensionality of ,& follows from tlie I'ncl tllat ,&V, wljere T7 is the volume of the body, is the magnetic moment M. I t is readily ascerlained that the dimensionality of the magnetic moment density did is identical to that of magnetic field: &.

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Nature of Magnetism (Science for Everyone) by M. I. Kaganov V. M. Tsukernik

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