= Motional electromotive force
{title2=$\mathcal E_{\rm mot}=\oint_C(\mathbf v\times\mathbf B)\cdot d\mathbf l$}
Motional electromotive force is the contribution caused by a conductor moving through a <magnetic field>. The magnetic part of the <Lorentz force> separates charges within the conductor. For a bar of length $L$ moving at velocity $v$ perpendicular to a uniform field, its magnitude is $BL|v|$; the sign follows the chosen circuit orientation. Together with the electric-field contribution it enters <Faraday's law> for moving circuits.
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