It's complicated and likely not at all relevant at 50 or 60 Hz frequencies. You want the sqrt(2p/ωμ) formula if you're curious. https://en.wikipedia.org/wiki/S

It's complicated and likely not at all relevant at 50 or 60 Hz frequencies. You want the sqrt(2p/ωμ) formula if you're curious. https://en.wikipedia.org/wiki/Skin_effect https://en.wikipedia.org/wiki/Skin_effect