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(A) For a ferromagnetic material,the magnetic susceptibility $\left( \chi \right)$ is very large and positive. As the temperature $T$ increases,the th

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(A) For a ferromagnetic material,the magnetic susceptibility $\left( \chi \right)$ is very large and positive. As the temperature $T$ increases,the thermal agitation of the atoms increases,which opposes the alignment of magnetic dipoles. Below the Curie temperature,the material remains ferromagnetic,but as it approaches the Curie temperature,the susceptibility decreases significantly. The variation is such that it remains relatively high and then drops as the temperature increases towards the Curie point,as shown in the provided figure.

The variation of magnetic susceptibility $\left( \chi \right)$ with absolute temperature $T$ for a ferromagnetic material is given in the figure by:

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