Dictionary:skin depth (δ)

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The effective depth of penetration of electromagnetic energy in a conducting medium when displacement currents can be neglected. The depth at which the amplitude of a plane wave has been attenuated to 1/e (or 37 percent):

,

where =conductivity in mhos/meter, =permeability in henries/meter, =angular frequency in radians/second, and f=frequency. Also called effective depth.


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Skin depth
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