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NEET PHYSICSEasy

Above Curie temperature:

A

a ferromagnetic substance becomes paramagnetic.

B

a paramagnetic substance becomes diamagnetic.

C

a diamagnetic substance becomes paramagnetic.

D

a paramagnetic substance becomes ferromagnetic.

Step-by-Step Solution

  1. Curie Temperature (TcT_c): The magnetic properties of ferromagnetic materials are dependent on temperature. The Curie temperature is a critical transition temperature specific to a ferromagnetic substance.
  2. Mechanism: In the ferromagnetic state, atomic dipoles are aligned in macroscopic domains. As the temperature increases, thermal agitation competes with this domain alignment.
  3. Transition: Above the Curie temperature, the thermal agitation becomes sufficient to disrupt the ordered domain structure. Consequently, the material loses its spontaneous magnetization and transforms from a ferromagnetic state to a paramagnetic state .
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