Magnetic Particle Inspection Level 2 Practice Exam

Which type of magnetism is observed in materials that are not attracted to magnets?

1. Ferromagnetic

2. Paramagnetic

3. Diamagnetic

4. Magnetically neutral

The correct answer is: Diamagnetic

The correct answer is diamagnetic. Diamagnetic materials are characterized by their lack of attraction to magnetic fields. When exposed to a magnet, these materials exhibit a very slight repulsion, which is a direct result of their electronic structure. In diamagnetic substances, all the electron spins are paired, meaning there are no net magnetic dipoles present. This behavior causes them to be unaffected by external magnetic fields and reinforces the understanding that they do not exhibit any significant magnetic properties. In contrast, other types of magnetism involve different interactions with magnetic fields. Ferromagnetic materials are strongly attracted to magnets and can retain their magnetism even after the external field is removed. Paramagnetic substances are weakly attracted to magnetic fields but do not retain that magnetism once the external field is removed. The term magnetically neutral is ambiguous and not a standard classification in magnetism, making diamagnetic the clear choice in this context. Understanding these distinctions is essential for effective practice in magnetic particle inspection.