Magnetism And Matter

Curie temperature is the temperature above which ferromagnetic material becomes paramagnetic material.

Curie Temperature is defined as the temperature at which certain materials lose their permanent magnetic properties, and are replaced by induced magnetism. Above this temperature, the paramagnetic substance obeys Curie Weiss law, even those resistances which are not ferromagnetic but only paramagnetic also obey Curie Weiss law above the Curie temperature only. Meaning, it is the temperature above which a ferromagnetic material becomes paramagnetic. In the case of rocks and minerals, remanent magnetism goes below the Curie point — about 570 °C (1,060 °F) for the common magnetic mineral magnetite.

Hence, the correct answer is option C.

Discover More from Chapter: Magnetic Properties of Materials

Curie temperature is the temperature above which ferromagnetic material becomes paramagnetic material.

Curie Temperature is defined as the temperature at which certain materials lose their permanent magnetic properties, and are replaced by induced magnetism. Above this temperature, the paramagnetic substance obeys Curie Weiss law, even those resistances which are not ferromagnetic but only paramagnetic also obey Curie Weiss law above the Curie temperature only. Meaning, it is the temperature above which a ferromagnetic material becomes paramagnetic. In the case of rocks and minerals, remanent magnetism goes below the Curie point — about 570 °C (1,060 °F) for the common magnetic mineral magnetite.

Hence, the correct answer is option C.

Discover More from Chapter: Magnetic Properties of Materials

The ability of a material to retain its magnetization after the external magnetic field is removed is called coercivity. For a permanent magnet, high coercivity is needed to retain its magnetization.
- Steel has higher coercivity than soft iron, meaning it is more resistant to demagnetization. This is crucial for permanent magnets, which need to retain their magnetic properties over time.
- Soft iron, on the other hand, has lower coercivity and is more easily magnetized and demagnetized, making it suitable for temporary magnets like electromagnets.
Thus, steel is preferred over soft iron for making permanent magnets because it has more coercivity.