Which of the following characteristics do not apply to magnetic materials?

The characteristic that does not apply to magnetic materials is that they exhibit no hysteresis loop. Magnetic materials, particularly ferromagnetic materials, display a hysteresis loop when subjected to a magnetic field. This loop represents the relationship between the magnetic flux density and the magnetic field strength. The presence of the hysteresis loop indicates that the material retains some magnetization even after the external magnetic field is removed, which is a key property of ferromagnetic materials.

In the context of magnetic materials, high permeability refers to the ability of the material to become magnetized in response to an external magnetic field. A definite saturation point on the hysteresis loop indicates the maximum magnetization a material can achieve before further increases in the magnetic field strength result in no significant increase in magnetization. Appreciable residual magnetism means that the material can retain some magnetization after the applied field is removed. Thus, while all other choices describe characteristics of magnetic materials, the absence of a hysteresis loop does not align with the properties typically exhibited by these materials.