The higher the coil current, the stronger magnetic field and thus smaller radius of the circular path of the electrons. The strength of the magnetic field and the Lorentz force are proportional to each other, such that when the Lorentz force increases. A larger Lorentz force will deflect the electrons more strongly, so the orbit will be smaller. The Lorentz force formula_1 is always perpendicular to the instantaneous direction of movement and allows a centripetal formula_2 circular motion. The magnitude of the velocity and hence the kinetic energy can not change: