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Magnetisation \( \mathbf{M} \) is defined as

  • A.the flux density within the material divided by that outside
  • B.the ratio of the internal field to the applied field
  • C.the magnetic dipole moment per unit volume
  • D.the total magnetic moment of the whole specimen

Answer: C

It is the magnetic counterpart of the electric polarisation, measured in amperes per metre, the same units as the field intensity. It enters the constitutive relation as \( \mathbf{B} = \mu_0(\mathbf{H} + \mathbf{M}) \).

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