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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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.