Discussion
Skin effect depends on:
Answer: D
Skin effect depends on All of the above.
The skin depth is \(\delta = \sqrt{\frac{\rho}{\pi f \mu}}\): it shrinks as the frequency \(f\) rises and grows with the resistivity \(\rho\) of the material. Whether this matters depends on the size of the conductor relative to \(\delta\): a thin wire carries current almost uniformly, while a thick conductor at the same frequency shows a strong effect.
So size, frequency and resistivity all affect it, and no single one of them is the complete answer.
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