The curie law, X = C/T, expressing susceptibility X varying with absolute temperature T, is obeyed by:

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AAI ATC Junior Executive 2018 Official Paper (Shift 1)
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  1. Both ferromagnetic and paramagnetic materials
  2. Ferromagnetic materials only
  3. Paramagnetic materials only
  4. Diamagnetic materials only

Answer (Detailed Solution Below)

Option 3 : Paramagnetic materials only
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Detailed Solution

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  • According to Curie’s Law, the magnetization in a paramagnetic material is directly proportional to the applied magnetic field.
  • If the object is heated, the magnetization is viewed to be inversely proportional to the temperature.
  • The law was discovered by the French physicist, Pierre Curie.
  •  

    For a fixed value of the field, the magnetic susceptibility (χ) is inversely proportional to temperature, i.e.

    M = χ H, with 

    χ = Magnetic Susceptibility

    M = Magnitude of resulting magnetization

    H = Magnitude of the applied magnetic field

    T = Absolute temperature, measured in kelvins (K)

    C = Material-specific Curie constant (K).

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