In the case of the magnetic material, the flux density non-linearly increases against the magnetic field.
It is easy to understand if the magnetic material is imagined as an electrical conductive material, the magnetic field as an electric field, and the flux density as an electric current. When a voltage is applied to the common electrical conductive material, a current flows in proportion to the voltage then, if the voltage is decreased, the current decreases in proportion to the voltage (Ohm’s Law). Figure 2 shows what is called the B-H curve (magnetic history curve) of magnetic material, showing the flux density B that flows in a magnetic material when a magnetic field H is applied.
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