Determining the specific charge of the electron

VP6.1.3.1
Determining the specific charge of the electron
Determining the specific charge of the electron Circular electron path in fine beam tube (P6.1.3.1)
Determining the specific charge of the electron

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Description

In the experiment P6.1.3.1, a tightly bundled electron beam is diverted into a closed circular path using a homogeneous magnetic field in order to determine the specific electron charge. The magnetic field B which diverts the electrons into the path with the given radius r is determined as a function of the acceleration voltage U. The Lorentz force caused by the magnetic field acts as a centripetal force. It depends on the velocity of the electrons, which in turn is determined by the acceleration voltage. The specific electron charge can thus be determined from the measurement quantities U, B and r according to the formula

Components of equipment sets

1 555571 Fine beam tube LD
1 555581  8  Helmholtz coils with holder and measuring device for fine beam tube LD
2 531120  4  Multimeter LDanalog 20 LD
1 521651  4  Tube power supply 0...500 V LD
1 521546 DC Power Supply 0...16 V/0...5 A LD
1 31178  4  Tape measure 2 m / 1 mm LD
3 500614  4  Safety connecting lead, 25 cm, black LD
3 500624  4  Safety connecting lead 50 cm, black LD
7 500644  4  Safety connecting lead, 100 cm, black LD
1 524005W  8  * Mobile-CASSY 2 WiFi LD
1 5240382  8  * Axial B sensor S, ±1000 mT LD
1 50111  4  * Extension cable, 15 pin LD

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) P6.1.3.1 Determining the specific charge of the electron
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