Magnetic Particle Inspection Level 1 Practice Exam

A continuous circular test object without a leakage magnetic field will have ________ north and south poles.

1. One detectable

2. No detectable

3. Two detectable

4. Many detectable

The correct answer is: No detectable

In a continuous circular test object that is magnetized, it creates a uniform magnetic field where the lines of magnetic flux are continuous and closed. This means that within the material, the magnetic field does not escape or leak to the outside environment. In this scenario, north and south poles develop in a magnetized object due to the arrangement of magnetic domains, but because the field is contained within the object and there are no excess field lines diverging from the surface, there are no detectable north or south poles outside of the material. Essentially, any detection of poles would rely on an external magnetic field or an application of a magnetic particle inspection method that reveals these anomalies. Thus, in the context of a continuous circular test object with no leakage, the answer indicates that despite the presence of magnetic domains internally, there will be no detectable north and south poles accessible to measurement from the outside.