Which material is indicated as having high permeability when comparing materials in a hysteresis curve?

High permeability in the context of a hysteresis curve refers to a material's ability to be magnetized easily and to maintain magnetic flux. When examining the hysteresis curves of various materials, those that exhibit a steep initial slope upon magnetization are indicative of high permeability. This steep slope means that a small input of magnetizing force results in a large increase in magnetic induction.

For Material II to be identified as having high permeability, its hysteresis curve must demonstrate this characteristic compared to the other materials. This means that it would show minimal reluctance to magnetic field changes, providing significant magnetic induction with less magnetizing effort. Consequently, if Material II is recognized as having the highest slope in the linear region of the hysteresis curve compared to the others, it reflects its capability to easily magnetize and demagnetize, thus marking it as a material with high permeability.

This quality is particularly important in applications where rapid magnetization changes occur, such as in magnetic particle testing, where effective permeability can enhance the visibility of magnetic particles and aid in flaw detection. Therefore, identifying Material II as having high permeability aligns with understanding how materials behave under magnetic influences in practical scenarios.