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Figure shows the variation of intensity ...

Figure shows the variation of intensity of magnetisation `vecM` versus the applied magnetic field intensity `vecH` for two materials A and B:
(a) Identify the materials A and B.
(b) Why does the material B, have a larger susceptibility than A for a given field at constant temperature ?

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(a) Material A is diamagnetic because its magnetisation is negative
Material B is paramagnetic having positive magnetisation .
(b) Magnetic susceptibility ` x = M/H` and its value is given by slope of M - H curve. As slope of curve for material B is greater, hence B has a large susceptibility than A for a given field at constant temperature.
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