An electron flies into the Wilson chamber, placed in a uniform magnetic field, and moves along an arc

An electron flies into the Wilson chamber, placed in a uniform magnetic field, and moves along an arc of a circle. What force plays the role of centripetal force in this case, changing the direction of the electron’s velocity vector? At what point did he fly into the camera?

To begin with, an electron flies into the Wilson chamber, placed in a uniform magnetic field, and moves along an arc of a circle.
In this way:
1. In a magnetic field, there is the Lorentz force;
2. The electron flew in from the bottom up;
3. The Lorentz force is directed to the center of the circle;