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What is the skin depth of copper at 60 Hz frequency?

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What is the skin depth of copper at 60 Hz frequency?

(a) 8 mm

(b) 8.5 mm

(c) 9 mm

(d) 9.5 mm

This question was addressed to me during an interview for a job.

This intriguing question originated from Magnaflux Test topic in section Non Destructive Techniques of Casting-Forming-Welding II

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The correct option is (b) 8.5 mm

Best explanation: The distribution of an alternating electric current inside the conductor, and the flow of current through the skin of the material is called skin effect. The depth of the skin effect is skin depth. For copper, at frequency 60 Hz, the skin depth is 8.5mm.

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