Confirming Coulomb’s law - Measuring with the torsion balance, Schürholz design

VP3.1.2.1
Confirming Coulomb’s law - Measuring with the torsion balance, Schürholz design
Confirming Coulomb’s law - Measuring with the torsion balance, Schürholz design

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Description

In the experiment P3.1.2.1, the coulomb force between two charged spheres is measured using the torsion balance. The heart of this extremely sensitive measuring instrument is a rotating body elastically mounted between two torsion wires, to which one of the two spheres is attached. When the second sphere is brought into close proximity with the first, the force acting between the two charged spheres produces torsion of the wires; this can be indicated and measured using a light pointer. The balance must be calibrated if the force is to be measured in absolute terms.
The coulomb force is measured as a function of the distance r. For this purpose, the second sphere, mounted on a stand, is brought close to the first one. Then, at a fixed distance, the charge of one sphere is reduced by half. The measurement can also be carried out using spheres with opposing charges. The charges are measured using an electrometer amplifier connected as a coulomb meter. The aim of the evaluation is to verify the proportionalities

and to calculate the permittivity ε0.

Components of equipment sets

1 51601 Torsion balance, Schürholz design LD
1 51620  8  Electrostatics, accessories LD
1 51604  8  Scale on stand LD
1 521721  8  High-voltage power supply, 25 kV LD
1 501051  4  Cable for high voltages, 1.5 m LD
1 59013  8  Stand rod with bore holes LD
1 30011  8  Saddle base LD
1 53214  4  Electrometer amplifier LD
1 562791  4  Plug-in power supply, 12 V AC LD
1 57825  8  Capacitor, 1 nF, STE 2/19 LD
1 57810  8  Capacitor, 10 nF, STE 2/19 LD
1 531120  8  Multimeter LDanalog 20 LD
1 54612  8  Faraday's cup LD
1 590011  4  Clamping plug LD
1 53216  8  Connecting rod LD
1 471791 Diode laser, 635 nm, 1 mW LD
2 30002  8  Stand base, V-shaped, small LD
1 30042  8  Stand rod, 47 cm, 12 mm diam. LD
1 30101  4  Leybold multiclamp LD
1 31327 Hand-held stop-watch, 60s/0.2s LD
1 31102  4  Metal rule, 1 m LD
1 50145  4  Connecting lead 19 A, 50 cm, red/blue, pair LD
1 500414  4  Connecting lead, 19 A, 25 cm, black LD
1 500424  4  Connecting lead 19 A, 50 cm, black LD
2 500444  4  Connecting lead 19 A, 100 cm, black LD
1 50143  4  Connecting lead 32 A, 200 cm, yellow/green LD
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