function calculateSkinDepth() {
const mu0 = 4 * Math.PI * 1e-7; // permeability of free space (H/m)
const frequency = parseFloat(document.getElementById(“frequency”).value);
const freqUnit = parseFloat(document.getElementById(“frequencyUnit”).value);
const sigma = parseFloat(document.getElementById(“material”).value); // conductivity in S/m

const f = frequency * freqUnit;

if (isNaN(f) || f <= 0) {
document.getElementById("skinDepthResult").innerHTML = "⚠️ Please enter a valid frequency.";
return;
}

const delta = Math.sqrt(1 / (Math.PI * f * mu0 * sigma)); // in meters
const delta_mm = delta * 1000; // convert to mm

document.getElementById("skinDepthResult").innerHTML =
`🧮 Skin Depth = ${delta_mm.toFixed(4)} mm`;
}

function clearSkinDepth() {
document.getElementById(“frequency”).value = “”;
document.getElementById(“skinDepthResult”).innerHTML = “”;
}

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