Which of the following statements is true regarding dry and wet magnetic particles?

Wet magnetic particles provide superior surface coverage due to the liquid medium used in the testing process. The fluid allows the magnetic particles to flow and spread evenly over the test surface, enabling them to coat even complex geometries and small defects more effectively. This enhanced coverage is essential in identifying discontinuities, as the particles can easily gather in areas where the magnetic field is disrupted, which may indicate flaws.

The versatility of wet magnetic particle testing makes it particularly effective for a wide range of applications, including those requiring finer defect detection. The liquid also aids in suspending the magnetic particles, maintaining their mobility and increasing the likelihood of capturing small surface anomalies as the magnetic particles are attracted to areas of magnetic flux leakage.

In contrast, dry particles, while easier to apply and clean up, might not adhere as effectively to surfaces, particularly those with complex shapes or textures. As a result, they may not provide the same level of sensitivity or defect detection capability, particularly for small or shallow defects. This contrast in performance is why the statement regarding wet particles providing better surface coverage resonates as true.