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Why the shape of B-H Curve is non-linear?

Why the shape of B-H Curve is non-linear? Correct Answer It indicates that relative permeability of a material is not constant but it varies.

Reason for non-linear BH curve:

  • The relative permeability (μr) is defined as the ratio of the absolute permeability (μ) and the permeability of free space (μo) and this was given as a constant.
  • The relationship between the flux density (B), and the magnetic field strength (H) also is the function of relative permeability (μr) as given,
    • B = μ H
  • The magnetic flux density in the material will be increased by a larger factor as a result of its relative permeability for the material compared to the magnetic flux density in a vacuum, μoH.
  • So the ratio of flux density to field strength ( B/H ) is not constant but varies with flux density which gives non-linearity to the B-H curve.

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