Assembling a Velocity Filter (Wien Filter) to Determine the Specific Electron Charge

In the experiment P3.8.5.2, a velocity filter (Wien filter) is constructed using crossed electrical and magnetic fields. Among other things, this configuration permits a more precise determination of the specific electron charge. At a fixed anode voltage UA, the current I of the Helmholtz coils and the deflection voltage UP are set so that the effects of the electric field and the magnetic field just compensate each other. The path of the beam is then virtually linear, and we can say:
COMPONENTS OF EQUIPMENT SETS:

1	555 624	Electron deflection tube
1	555 600	Tube stand
1	555 604	Pair of Helmholtz coils
2	521 70	High-voltage power supply, 10 kV
1	521 546	DC Power Supply 0 ... 16 V, 0 ... 5 A
2	500 611	Safety connecting lead, 25 cm, red
1	500 621	Safety connecting lead, 50 cm, red
1	500 622	Safety connecting lead, 50 cm, blue
2	500 641	Safety connecting lead, 100 cm, red
4	500 642	Safety connecting lead, 100 cm, blue
2	500 644	Safety connecting lead, 100 cm, black

EXPERIMENT INSTRUCTIONS PLEASE CLICK HERE