gyroradius
Noun
Meaning
gyroradius (plural gyroradii)
(physics) The radius of the circular motion of a charged particle in the presence of a uniform magnetic field.
Examples
The radial magnetic field is designed to be strong enough to substantially deflect the low-mass electrons, but not the high-mass ions, which have a much larger gyroradius and are hardly impeded.
However, the gyroradius in those circumstances is also larger, so that the radial component of the magnetic field seen by the particle is also larger.