Mechanical momentum
= Mechanical momentum
{title2=$\boldsymbol\pi=\mathbf p-q\mathbf A$}
For a charged particle minimally coupled to a magnetic <vector potential>, the mechanical momentum is $\boldsymbol\pi=\mathbf p-q\mathbf A$, with $\mathbf p$ the <canonical momentum>. It is the <mass> times <velocity> in nonrelativistic mechanics.