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The penetration depth is proportional to the square root of the resistivity of the conductor, and is inversely proportional to the square root of the frequency and the magnetic permeability. In general, the higher the frequency, the more concentrated the current is on the surface of the steel plate; the lower the frequency, the more dispersed the surface current. It is necessary to pay attention to: Although the iron and steel is a conductor, but its permeability will decrease with the increase of temperature, that is, when the temperature of the steel plate, the permeability will fall, the skin effect will decrease.