[Solved] The important difference between AC and DC current for magnetic particle testing purposes is:

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Q.	The important difference between AC and DC current for magnetic particle testing purposes is:
A.	The skin effect caused by DC adds mobility to the magnetic particles
B.	The resulting AC magnetic fields are more difficult to demagnetize
C.	The DC magnetic fields are more penetrating
D.	The AC magnetic fields are stronger
Answer» C. The DC magnetic fields are more penetrating

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