What does the distance represented by C measure in terms of the material's magnetic properties?

The distance represented by C in the context of Eddy Current Testing relates to coercive force, which is a measure of the material's ability to withstand an external magnetic field without becoming magnetized. Coercive force essentially indicates how resistant a material is to becoming magnetized and reflects the material's intrinsic magnetic characteristics.

In the realm of magnetic properties, coercive force plays a critical role in defining how a material behaves when subjected to a magnetic field. A high coercive force indicates that a material requires a significant amount of energy to magnetize or demagnetize, making it less likely to retain residual magnetism once the external field is removed. Consequently, understanding the coercive force of a material is important because it informs decisions regarding its application in various environments where magnetic stability is crucial.

While permeability relates to how well a material can support the formation of a magnetic field within itself, and conductivity pertains to how easily electric current can flow through a material, both of these properties do not directly address the aspect of resistance to magnetization that coercive force encapsulates. Similarly, residual magnetism refers to the magnetization that remains after the removal of the external magnetic field, and while it may relate to coercive force, it does not define the distance represented by