Assembling a velocity filter (Wien filter) to determine the specific electron charge

VP3.8.5.2
Assembling a velocity filter (Wien filter) to determine the specific electron charge
Assembling a velocity filter (Wien filter) to determine the specific electron charge

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Description

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 555624 Electron deflection tube LD
1 555600  4  Tube stand LD
1 555604  8  Pair of Helmholtz coils LD
2 52170  8  High-voltage power supply, 10 kV LD
1 521546  4  DC Power Supply 0...16 V/0...5 A LD
2 500611  4  Safety connecting lead, 25 cm, red LD
1 500621  4  Safety connecting lead 50 cm, red LD
1 500622  4  Safety connecting lead 50 cm, blue LD
2 500641  8  Safety connecting lead, 100 cm, red LD
4 500642  4  Safety connecting lead, 100 cm, blue LD
2 500644  8  Safety connecting lead, 100 cm, black LD
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