What temperature is the curie point?

What temperature is the curie point?

• A. 1415F (770C)
• B. 1200F (649C)
• C. 1000F (538C)
• D. 1600F (871C)

Answer: (A)

The key idea is the Curie temperature, the point at which ferromagnetic materials lose their permanent magnetism and become paramagnetic because thermal motion disrupts the alignment of magnetic domains. For iron and steel, this happens at about 770°C, which is roughly 1415°F. So the value around 1415°F (770°C) is the correct one, since it matches the Curie temperature of iron. Above this temperature, a magnet no longer attracts the steel, which is why magnet-based indicators are sometimes used to gauge heat during welding. The other temperatures listed aren’t the Curie point for iron, so they don’t represent the temperature at which magnetism is lost.

The key idea is the Curie temperature, the point at which ferromagnetic materials lose their permanent magnetism and become paramagnetic because thermal motion disrupts the alignment of magnetic domains. For iron and steel, this happens at about 770°C, which is roughly 1415°F. So the value around 1415°F (770°C) is the correct one, since it matches the Curie temperature of iron. Above this temperature, a magnet no longer attracts the steel, which is why magnet-based indicators are sometimes used to gauge heat during welding. The other temperatures listed aren’t the Curie point for iron, so they don’t represent the temperature at which magnetism is lost.