The temperature above which a material loses its magnetism.

The temperature above which a material loses its magnetism.

• A. Curie Point
• B. Density
• C. Core
• D. Earthquake

Answer: (A)

Thermal energy disrupts the alignment of magnetic moments in ferromagnetic materials. At low temperatures, exchange interactions keep many moments aligned, so the material acts like a permanent magnet. As temperature rises, random motion breaks this order, and once you reach the Curie temperature, long-range magnetic order is lost and the material becomes only weakly magnetic in an external field. So, the temperature above which a material loses its magnetism is the Curie temperature (Curie point). Density, core, and earthquake are unrelated to this magnetic threshold.

Thermal energy disrupts the alignment of magnetic moments in ferromagnetic materials. At low temperatures, exchange interactions keep many moments aligned, so the material acts like a permanent magnet. As temperature rises, random motion breaks this order, and once you reach the Curie temperature, long-range magnetic order is lost and the material becomes only weakly magnetic in an external field. So, the temperature above which a material loses its magnetism is the Curie temperature (Curie point). Density, core, and earthquake are unrelated to this magnetic threshold.