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The Curie temperature is defined as the temperature beyond which

1. a ferromagnetic substance changes into a paramagnetic one
2. a paramagnetic substance changes into a diamagnetic one
3. a ferromagnetic substance changes into a diamagnetic one
4. a paramagnetic substance changes into a ferromagnetic one

Correct answer: a ferromagnetic substance changes into a paramagnetic one

Solution

The Curie temperature marks the point at which a ferromagnetic material loses its permanent magnetism and becomes paramagnetic, meaning it can no longer maintain a magnetic alignment without an external magnetic field.

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