ASNT NDT III ET Practice Questions - ASNT NDT Level III Electromagnetic Eddy Current Testing (ET) Method Examination Exam

What does Lenz's law tell you about the direction of eddy currents induced in a conductor by an approaching probe coil?

Their direction depends only on temperature, not on probe motion They flow in the same direction as the probe current to reinforce the field They flow in a direction that opposes the change in the original magnetic flux They flow only along the surface in the direction of probe motion

Correct Answer:

They flow in a direction that opposes the change in the original magnetic flux

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