Ultrarelativistic magnetic bending radius
= Ultrarelativistic magnetic bending radius
For motion perpendicular to a uniform <magnetic field>, the <Lorentz force> gives $r=p/(|q|B)$. An ultrarelativistic massive particle has $pc\simeq E$, hence $r\simeq E/(|q|Bc)$. Total <energy> and <kinetic energy> differ by the rest <energy>.