Diego recently read about magnetic flux leakage testing, which, as he describes

Question

Diego recently read about magnetic flux leakage testing, which, as he describes to Madeline, is a nondestructive method of determining the integrity of steel structures, mainly pipelines and storage tanks. To understand magnetic flux leakage testing, the friends consider a bar magnet. When it is cracked, a north and south pole will form at each edge of the crack, and the magnetic field in the crack exits the north pole and enters the south pole. The field is said to "leak" out of the material into the air gap between the edges of the gap. A magnetic detector can then be used to locate the leak. Madeline asks Diego how this phenomenon might be used to test structures made of steel. Which response is correct?

1. "A bar magnet can be used to test the magnetism of the structure. Where the structure is not magnetic, there must be a structural anomaly."

2. "Use the magnetic detector to find the leaking field."

3. "A powerful magnet can be used to magnetize the steel of the structure to be tested, and the magnetic detector can then be used to locate any structural anomalies."

4. "Magnetize the steel of the structure using a powerful magnet and then use a bar magnet to find the leaking field."

Explanation / Answer

"A powerful magnet can be used to magnetize the steel of the structure to be tested, and the magnetic detector can then be used to locate any structural anomalies.". This is correct as the structure anamolies can be found out in a non destructive method

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