What defects will be detected by magnetizing a part using continuous longitudinal magnetization with a cable?

When magnetizing a part using continuous longitudinal magnetization with a cable, the primary focus is on the orientation of the magnetic field in relation to the detected defects. This method generates a magnetic field that runs along the length of the part, which is particularly effective in identifying defects that are oriented perpendicular to the long axis.

In this context, defects such as cracks or flaws that are oriented at right angles to the direction of the magnetic field will cause magnetic flux leakage. This leakage is what the detection method identifies, indicating the presence of a defect. The effectiveness of this approach thus lies in its ability to reveal defects that disrupt the magnetic field, making perpendicular defects most detectable.

Surface defects may also be identified, but only if they intersect the magnetic field. However, the method is specifically tailored to detect the more critical perpendicular defects, which can have a significant impact on the structural integrity of the part. Manufacturing defects can be identified as well, but the method is not limited to those.

Given this understanding, option C accurately describes what continuous longitudinal magnetization with a cable detects, focusing on the alignment of the defects relative to the applied magnetic field.