1. The problem statement, all variables and given/known data electrons emitted by a certain device are observed to travel in a circular path with a radius of 2.0cm when plaves in a uniform magnetic field whose strength is 10MN/C. What is the speed of the elctrons emitted by this device? 2. Relevant equations I know that 10MN/C is "b-bar" as it is called in the book. But i'm not sure what equation to use. 3. The attempt at a solution I attempted to use the equation Fm=q(velocity/c x B).... but im not sure what to use for the magnetic force.