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A prime consideration when selecting a powder to be used as a magnetic particle medium is to select a powder that
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Provides a high contrast to the surface being tested.
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Provides a low contrast to the surface being tested.
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Will adhere to the surface being tested
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Requires a high demagnetization current to remove it.
That's Correct!
It's Wrong!
When selecting a powder to be used as a magnetic particle medium, it is important to choose a powder that provides a high contrast to the surface being tested. This is because a high contrast allows for better visibility and detection of any defects or cracks on the surface. A powder with low contrast would make it difficult to distinguish between the magnetic particles and the surface, leading to potential missed defects. Adherence to the surface being tested and the requirement of a high demagnetization current are not prime considerations when selecting the powder.
