Physics Laws & Theorems
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Ampère's Law

A magnetic field circulates around an electric current.

Formula

∮B⃗⋅dl⃗=μ0I\oint \vec{B} \cdot d\vec{l} = \mu_0 I

Variables

\vec{B}Magnetic field
\mu_0Permeability
ICurrent

Example

The magnetic field around a wire circles it and grows with the current it carries.

Did You Know?

Ampère's law links electric current to the magnetic field that circles around it.

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