Task:
Check the validity of the formula ${r=\frac{m_e\cdot v_0}{e\cdot B}}$ for the radius of the circular path using the experiment.
The theoretical circular path is shown in blue and can be switched on and off.
$F_{Zentripetal} = m_e\frac{{v_0}^2}{r} $
$$ F_{Lorentz} = e\cdot v_0 \cdot B$$