PhysRefPhysics reference
Electricity & Magnetism
∮B⃗⋅dl⃗=μ0Ienc\oint \vec{B} \cdot d\vec{l} = \mu_0 I_{enc}

Line integral of magnetic field around closed loop equals μ₀ times enclosed current.

Variables

∮B·dl
Line integral
Around closed path
T·m
μ₀
Permeability
4π×10⁻⁷
H/m
I_enc
Enclosed current
Current through loop
A

Derivation

One of Maxwell's equations (magnetostatics form).

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