= Gyroradius
{title2=$r=mv_\perp/(|q|B)$}
= Larmor radius
{c}
{synonym}
The <gyroradius> is the <radius> of the transverse <circular motion> of a <charged particle in a uniform magnetic field>. In nonrelativistic <classical mechanics>, with zero <electric field> and no other <forces>, it is $mv_\perp/(|q|B)$, where $v_\perp$ is the <speed> perpendicular to the <magnetic field>. The parallel component of <velocity> changes the advance of the <helix>, rather than its transverse <radius>.
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