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.