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Eddy currents are not used for the measure of which of the following properties?

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in Casting-Forming-Welding II by (119k points)
Eddy currents are not used for the measure of which of the following properties?

(a) Electrical conductivity

(b) Magnetic resistivity

(c) Hardness

(d) Grain size

I have been asked this question during an interview for a job.

My query is from Eddy Current Test in section Non Destructive Techniques of Casting-Forming-Welding II

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Correct option is (b) Magnetic resistivity

For explanation: The inspection of structures done by eddy current method is based on the principle of electromagnetic induction. This method of detecting defects can be used for knowing the measure of electrical conductivity, grain size, hardness and magnetic permeability.

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