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A magnetic domain is a region in which

  • A.the applied field has penetrated the material fully
  • B.the material has been heated above its Curie point
  • C.the atomic moments are all aligned in one direction
  • D.the flux density is uniform throughout the specimen

Answer: C

Domains form because the alignment they impose costs less energy than the external field a uniformly magnetised body would produce. In an unmagnetised specimen the domains point in many directions and their moments cancel.

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