Device list:

Tube for the electron diffraction experiment or Brausch tube from the beginners' practical course, each with the required voltage sources, permanent magnet, Teflon rod and cotton cloth if necessary

Description of the experiment:

After heating up the tube, a luminous dot becomes visible on the screen, which can be influenced by the permanent magnet (Lorentz force).

High electric field strengths also deflect the beam from its linear direction of movement (force on charges in the electric field).

Remarks:

The Braun tube could be found in almost every household until the end of the 20th century, as it formed the basis for television and other screens.