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Consider the following statements regarding a ferromagnetic material: 1. Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit a hysteresis effect. 2. The coercive force is the field required to reduce the flux density to zero. Which of the above statements is/are correct?

Consider the following statements regarding a ferromagnetic material: 1. Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit a hysteresis effect. 2. The coercive force is the field required to reduce the flux density to zero. Which of the above statements is/are correct? Correct Answer Both 1 and 2

  • Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit hysteresis effect.
  • Hysteresis effect is the magnetization of ferromagnetic substances due to a varying magnetic field lags behind the field.
  • Coercivity in a ferromagnetic material is the intensity of the applied magnetic field required to reduce the magnetization of that material to zero after the magnetization of the sample has been driven to saturation.

 

Important Points:

  • Curie temperature: It is the temperature above which ferromagnetic materials lose their permanent magnetic field and the magnetism completely disappears.
  • The magnetic susceptibility decreases with an increase in temperature. So, the ferromagnetism decreases with rising temperature. It is maximum at absolute zero temperature and becomes zero at Curie temperature.
  • Above this temperature, the ferromagnetic material behaves as a paramagnetic substance.

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