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The magnetic susceptibility (χ) of materials can be classified as follows: diamagnetic substances have a small negative value (|χ| = −1), paramagnetic substances have a small positive value (|χ| = 1), and ferromagnetic substances have a large positive value (|χ| = 10²).

1. A → Diamagnetic
2. B → Paramagnetic
3. C → Ferromagnetic
4. D → Non-magnetic

Correct answer: C → Ferromagnetic

Solution

Ferromagnetic materials have a high and positive magnetic susceptibility (χ), typically in the range of 10² or higher, which matches the description provided for option C.

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