We can use the period of the motion to determine the speed of the particle in terms of the radius of the circular path: v=2πRT and then use the equation ...We can use the period of the motion to determine the speed of the particle in terms of the radius of the circular path: v=2πRT and then use the equation for the cyclotron radius to relate this to the charge-to-mass ratio of the particle: R=mvqB=2πRmqBT∴