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GyroradiusThe gyroradius (also known as radius of gyration, Larmor radius or cyclotron radius) defines the radius of the circular motion of a charged particle in the presence of a uniform magnetic field. Additional recommended knowledgewhere
Similarly, the frequency of this circular motion is known as the gyrofrequency or cyclotron frequency, and is given by: For electrons, this works out to be DerivationIf the charged particle is moving, then it will experience a Lorentz force given by: where is the velocity vector, is the magnetic field vector, and q is the particle's electric charge. Notice that the direction of the force is given by the cross product of the velocity and magnetic field. Thus, the Lorentz force will always act perpendicular to the direction of motion, causing the particle to move in a circle (gyrate). The radius of this circle r_{g} can be determined by equating the magnitude of the Lorentz force to the centripetal force: where
Solving for r_{g}, the gyroradius is determined to be: Thus, the gyroradius is directly proportional to the particle mass and velocity, and inversely proportional to the particle electric charge, and the magnetic field strength. See also
References & further reading

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Gyroradius". A list of authors is available in Wikipedia. 