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The relative permeability of a material exceeds its magnetic susceptibility by

  • A.the permeability of free space
  • B.a factor equal to the permeability of free space
  • C.nothing
  • D.exactly one

Answer: D

From the constitutive relation and the definition \( \mathbf{M} = \chi_m\mathbf{H} \) it follows that \( \mu_r = 1 + \chi_m \). A vacuum has zero susceptibility and unit relative permeability, which is the check on the relation.

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