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Magnetic Properties of Matter question

2021 · 25 Feb · Shift 2 · Q54
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Magnetic Properties of Matter question

2021 · 25 Feb · Shift 2 · Q54

JEE MainPhysicsMagnetic Properties of MatterMCQ+4 / −1
In a ferromagnetic material, below the curie temperature, a domain is defined as :
  1. A
    a macroscopic region with zero magnetization.
  2. B
    a macroscopic region with saturation magnetization.
  3. C
    a macroscopic region with randomly oriented magnetic dipoles.
  4. D
    a macroscopic region with consecutive magnetic dipoles oriented in opposite direction.
View written solutionFree

Correct answer: B

  1. Meaning of a ferromagnetic domain

    In a ferromagnetic material, below the Curie temperature, the atomic magnetic moments tend to align parallel due to exchange interaction.

  2. What is a domain?

    A domain is a region inside the ferromagnetic specimen in which a very large number of atomic magnetic moments are aligned in the same direction.

    Therefore, within a domain, the magnetization is maximum and uniform, i.e. it is essentially at saturation magnetization.

  3. Check each option

    • A: a macroscopic region with zero magnetization.
      Incorrect. Inside a domain, magnetization is not zero.

    • B: a macroscopic region with saturation magnetization.
      Correct. A domain is a region where magnetic moments are aligned, giving saturation magnetization.

    • C: a macroscopic region with randomly oriented magnetic dipoles.
      Incorrect. Random orientation corresponds to no net magnetization, not a ferromagnetic domain.

    • D: a macroscopic region with consecutive magnetic dipoles oriented in opposite direction.
      Incorrect. Opposite orientation would cancel magnetization, which is not the definition of a domain.

  4. Final answer

    The correct option is: B\boxed{B}B​

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