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Electric Field linearly accelerates $e^{-}$ from voltage in Electron Gun: V_a

$\Rightarrow v_0=\;$ ${5.930\cdot 10^6}$ $\frac{\text m}{\text s}$

Magnetic Field circularly accelerates $e^{-}$ from current in Helmholtz coils through coils: I_α

$\Rightarrow B=\;$ ${0}$ $\text {T}$

Theoretischer Radius ein/aus

Schematic Diagram

The theoretical circular path is shown in blue and can be switched on and off.

$${r = \frac {m_e\cdot v_0}{e\cdot B}}=4.25\,\rm{cm}$$