Electric Field linearly accelerates $e^{-}$ from voltage in Electron Gun: Va
Magnetic Field circularly accelerates $e^{-}$ from current in Helmholtz coils through coils: Iα

Schematic Diagram

Schematic layout of the experiment about electron deflection in a magnetic field
Picture of the real experiment for deflection of electrons in a magnetic field

Use the experiment to test and rate your hypotheses!

- the higher I, the smaller the radius of the circular orbit
- acceleration voltage Va has no influence