— Coil & Inductor Design
Inductance for three common coil geometries — air-core solenoid (L = μ₀N²A/l), toroid (L = μ₀N²A/(2πr)), and a straight round wire (L ≈ (μ₀l/2π)[ln(4l/d) − 1]). Solenoid and toroid modes also report the core's magnetic field strength B at the given current.