3.2.1 Circular motion

By=50, normal to the velocity.


 

The basic equation expresses the identity of the centripetal force with qvB:

The trajectory is a circle, and the angular velocity depends only on the ratio q/m and the value of the field. The trajectory radius, R=v/w, depends on the q/m ratio, and is proportional to v and inversely proportional to B. This kind of motion is employed in a device to measure atomic masses.