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(C) Permanent magnets are made from ferromagnetic materials that retain their magnetic properties even after the external magnetic field is removed.To

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Materials with high retentivity and high coercivity

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(C) Permanent magnets are made from ferromagnetic materials that retain their magnetic properties even after the external magnetic field is removed.To achieve this,the material must have high retentivity so that it remains strongly magnetized.Additionally,it must have high coercivity so that it is not easily demagnetized by external magnetic fields,temperature fluctuations,or mechanical impacts.Therefore,materials with high retentivity and high coercivity are ideal for making permanent magnets.

List-$I$ (Material)	List-$II$ (Susceptibility $(\chi)$)
$A$. Diamagnetic	$I$. $\chi=0$
$B$. Ferromagnetic	$II$. $0 > \chi \geq -1$
$C$. Paramagnetic	$III$. $\chi >> 1$
$D$. Non-magnetic	$IV$. $0 < \chi < \varepsilon$ (a small positive number)

What materials should be used to make permanent magnets?

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