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Magnetising a ferromagnetic specimen from the unmagnetised state proceeds first by

  • A.the rotation of every atomic moment into line with the field
  • B.the destruction of the domain structure altogether
  • C.the reversal of the moments in every domain simultaneously
  • D.the growth of favourably oriented domains at the expense of others

Answer: D

Domain walls move so that domains already close to the field direction grow, which needs only a small field. Only at higher fields does the magnetisation within a domain rotate bodily toward the applied direction, and saturation follows when all of it has.

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