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What is Curie constant and Curies law

What is Curie constant and Curies law?

Curie constant: C (P. Curie): The characteristic constant, dependent on the material in question that points out the proportionality among its susceptibility and its thermodynamic temperature.

Curie's law (P. Curie): The susceptibility, khi, of an isotropic paramagnetic substance is associated to its thermodynamic temperature T by the equation:

khi = C/T

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