The statement 'Magnetic particle inspection can only be used to detect flaws at or near the surface' is:

The statement 'Magnetic particle inspection can only be used to detect flaws at or near the surface' is:

• A. True
• B. False
• C. It detects deep flaws as well
• D. It cannot detect any flaws

Answer: (A)

Magnetic particle inspection works by magnetizing a ferromagnetic part and applying fine magnetic particles. Flaws that disrupt the magnetic field create leakage flux that guides the particles to gather at the defect, producing a visible indication. This method is most sensitive to flaws that reach the surface or are very near it, because the leakage field must reach the surface to attract the particles. If a flaw is completely internal and does not intersect the path of the flux to the surface, there’s little to no surface leakage and no reliable indication forms. So MPI is suited for surface-breaking and near-surface flaws, but not reliable for deep internal flaws.

Magnetic particle inspection works by magnetizing a ferromagnetic part and applying fine magnetic particles. Flaws that disrupt the magnetic field create leakage flux that guides the particles to gather at the defect, producing a visible indication. This method is most sensitive to flaws that reach the surface or are very near it, because the leakage field must reach the surface to attract the particles. If a flaw is completely internal and does not intersect the path of the flux to the surface, there’s little to no surface leakage and no reliable indication forms. So MPI is suited for surface-breaking and near-surface flaws, but not reliable for deep internal flaws.