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  4. The variation of magnetic susceptibility ( chi) with absolute temperature T for a ferromagnetic material is

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Q. The variation of magnetic susceptibility (χ) with absolute temperature T for a ferromagnetic material is

Magnetism and Matter

Solution:

Susceptibility of a ferromagnetic substance falls with rise of temperature (χ=cT−Tc) and the substance becomes paramagnetic above Curie's temperature, so magnetic susceptibility becomes very small above Curie's temperature.