What do you understand by skin depth?
When an AC current is applied to a conductor, the current concentrates near the surface of the conductor and its strength decreases as you go towards the center of the conductor. The depth till which current flows in a conductor is called as Skin Depth.
The Skin Depth is dependent on the frequency of the current/signal and the resistivity of the material. It inversely proportional to the frequency and directly proportional to the resistivity.
The Skin Depth can be calculated using the following formula:
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