Magnetic Particle Inspection Level 2 Practice Exam

In magnetic particle inspection, which type of charge typically enhances localized magnetic fields around defects?

1. Positive charge

2. Negative charge

3. Electromagnetic charge

4. Static charge

The correct answer is: Electromagnetic charge

In magnetic particle inspection (MPI), the enhancement of localized magnetic fields around defects is primarily achieved through the use of electromagnetic fields. When defects are present in a material, they disrupt the uniformity of the magnetic field. By applying an electromagnetic charge, the magnetic flux lines bend and concentrate at these discontinuities, which makes them more visible when magnetic particles are applied. Electromagnetic fields can be generated through AC or DC magnetization techniques, which further increases the sensitivity of the inspection method. This approach allows for better detection of surface and near-surface defects, as the localized magnetic flux created by these fields effectively highlights areas where the magnetic particles can accumulate. The other options do not contribute to enhancing localized magnetic fields in the context of MPI. Static charge, for example, refers to an imbalance of electric charges and would not create a changing magnetic field necessary for highlighting defects.