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sci.skin-depth-electromagnetic Calculator
Calculates skin depth of electromagnetic fields in a conducting material: δ = 1/√(πfµσ), and the current density decay profile. RF shields must be several skin depths thick for effective shielding — a 0.1 mm copper foil shields adequately above 400 kHz but transmits low-frequency fields.
Inputs
Freq Hz
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
Sigma Sm
Reference formula or conversion factor shown for context.
Mu R
Reference formula or conversion factor shown for context.
Results
skin depth δ (mm)
The computed depth.
surface resistance Rs (Ω/□)
Opposition to current flow (Ω). Ohm's Law: V = IR. Lower resistance means more current for the same voltage.
5% penetration depth ≈ 3δ (mm)
The proportional relationship between two quantities.
δ = √(2/(ωμσ)) | Rs = 1/(σδ)
Reference formula or conversion factor shown for context.