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NEET PHYSICSEasy

Nickel shows the ferromagnetic property at room temperature. If the temperature is increased beyond Curie's temperature, then it will show:

A

paramagnetism

B

anti-ferromagnetism

C

no magnetic property

D

diamagnetism

Step-by-Step Solution

  1. Ferromagnetism and Temperature: The magnetic properties of ferromagnetic materials (like Nickel, Iron, Cobalt) are dependent on temperature. In the ferromagnetic state, atomic dipoles are aligned in macroscopic domains .
  2. Curie Temperature: There exists a critical temperature called the Curie temperature (TcT_c) for every ferromagnetic material. Above this temperature, the thermal agitation becomes sufficient to disrupt the ordered domain structure.
  3. Transition: When a ferromagnetic substance is heated above its Curie temperature, the domain structure disintegrates, and the material loses its spontaneous magnetization, transforming into a paramagnetic substance. It remains paramagnetic at all temperatures higher than TcT_c .
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