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Question: Answered & Verified by Expert
In a permanent magnet at room temperature.
PhysicsMagnetic Properties of Matter
Options:
  • A
    magnetic moment of each molecule is zero
  • B
    the individual molecules have non-zero magnetic moment which are all perfectly aligned
  • C
    domains are partially aligned
  • D
    domains are all perfectly aligned
Solution:
1853 Upvotes Verified Answer
The correct answer is:
domains are all perfectly aligned
We know that a permanent magnet is a substance which at room temperature retain ferromagnetic property for a long period of time. The individual atoms in a ferromagnetic material possess a dipole moment as in a paramagnetic material. However, they interact with one another in such a way that they spontaneously align themselves in a common direction over a macroscopic volume i.e., domain.
Hence, in a permanent magnet at room temperature, domains are all perfectly aligned.

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