Magnetic field at center of circular arc (B = (μ₀I/4πR)θ, θ in rad)

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B = (μ₀I/4πR)θ, θ in rad

What each symbol means

SymbolWhat it stands for
θSubtended angle at center in radians

When to use this

Uniform current along arc of radius R; field evaluated at arc's center of curvature.