A simple magnetic substance is one involving only magnetic work, that is, a change in magnetization of

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A simple magnetic substance is one involving only magnetic work, that is, a change in magnetization of a substance in the presence of a magnetic field. For such a substance undergoing a quasi equilibrium process at constant volume, the work is W = - Co H d M where H = magnetic field intensity, M = magnetization, and Co = a proportionality constant. For a first approximation, assume that magnetization is proportional to the magnetic field intensity divided by the temperature of the magnetic substance. Determine the work done in an isothermal process during a change of magnetization from M1 to M2.
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Fundamentals of Physics

ISBN: 978-1118230725

10th Extended edition

Authors: Jearl Walker, Halliday Resnick

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