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

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

VP3.8.5.2

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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 U_A, the current I of the Helmholtz coils and the deflection voltage U_P 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
1	555600 4	Tube stand
1	555604 8	Pair of Helmholtz coils
2	52170 8	High-voltage power supply, 10 kV
1	521546 4	DC Power Supply 0...16 V/0...5 A
2	500611 4	Safety experiment cable, 25 cm, red
1	500621 4	Safety experiment cable, 50 cm, red
1	500622 4	Safety experiment cable, 50 cm, blue
2	500641 8	Safety experiment cable, 100 cm, red
4	500642 4	Safety experiment cable, 100 cm, blue
2	500644 8	Safety experiment cable, 100 cm, black

Experiment Instructions

PDF (Experiment description)

P3.8.5.2 Assembling a velocity filter (Wien filter) to determine the specific electron charge

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

Description

Components of equipment sets

Experiment Instructions

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