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 , where is the speed perpendicular to the magnetic field. The parallel component of velocity changes the advance of the helix, rather than its transverse radius.
Gyroradius, also known as the Larmor radius, is the radius of the circular motion (or spiral path) that a charged particle, such as an electron or ion, describes when it moves perpendicular to a uniform magnetic field. This motion occurs because the magnetic field exerts a Lorentz force on the charged particle, causing it to move in a circular path.
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