Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic, and ferromagnetic), which are used to make permanent magnets?
Answer: Only diamagnetic
Explanation
Ferromagnetic materials (such as iron, cobalt, and nickel) have a strong attraction to magnetic fields and can retain their magnetism even after the external magnetic field is removed.
This property makes them ideal for making permanent magnets.
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Diamagnetic materials are repelled by magnetic fields and cannot retain magnetism.
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Paramagnetic materials are weakly attracted to magnetic fields but do not retain magnetism after the external field is removed.
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