Q117 / 200 · NEET 2008 (Screening) · Physics

Curie temperatures is the temperature above which

  • Correct answer
    A
    ferromagnetic material becomes paramagnetic material
  • B
    paramagnetic material becomes diamagnetic material
  • C
    paramagnetic materíal becomes ferromagnetic material
  • D
    ferromagnetic material becomes diamagnetic material

Solution

Ferromagnetism decreases with rise in temperature. If we heat a ferromagnetic substance, then at a definite temperature the ferromagnetic property of the substance suddenly disappears and the substance becomes paramagnetic. The temperature above which a ferromagnetic substance becomes paramagnetic is called the Curie temperature of the substance. Note: The Curie temperature of iron is $770^{\circ} \mathrm{C}$ and that of nickle in $358^{\circ} \mathrm{C}$.

Hence, the correct answer is option: 'A'.

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