3B SCIENTIFIC® PHYSICS |
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U17250 Electroscope
Instruction Sheet
6/03 ALF
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The device is used for an introduction into the fundamentals of electrostatics and for displaying DC and AC voltages as well as demonstrating the operating principles of high voltage meters according to Braun.
1.Safety instructions
•Make sure that the insulator is always clean and dry. If necessary use alcohol or spirits for cleaning.
•At high humidity and after transporting the unit from a cool room into a warmer one, dry the electroscope in a stream of hot air (e.g. a hair dryer).
2.Description, technical data
The electroscope consists of a metal baseplate on which the iron shielding ring for defined field distribution is mounted. The iron ring is equipped with a 4-mm socket for earthing purposes. The support for needle with pivot bearing is attached electrically insulated to the shielding ring. The pointer is suspended asymmetrically and so its weight delivers the restoring moment. Inside the electrically conductive insulator at the upper part of the device there is a 4-mm socket for mounting the sphere and capacitor plate.
For demonstration experiments the electroscope is suitable for shadow projection using a point source light.
Diameter: |
130 mm |
1 Sphere with 4-mm plug
2 Insulator
3 Shielding ring
4 Baseplate
5 Capacitor plate with 4-mm plug
6 Capacitor plate on insulating rod
7 4-mm socket
8 Support with pointer
2.1 Scope of supply
1 Electroscope
1 Sphere with 4-mm plug
1 Capacitor plate with 4-mm plug
1 Capacitor plate on insulating rod
3. Operation
The electroscope is charged using friction rods statically charged by various friction-inducing materials (e.g. U11053), or using a high-voltage power supply unit (e.g. U21060).
3.1Charging up the electroscope by touching it with a statically charged body
•Attach the sphere or capacitor plate to the electroscope.
•Rub the friction rod with the suitable material (PVC or acrylic rods e.g. with plastic foil).
•Touch the sphere or capacitor plate with the charged rod. The pointer deflects.
•Remove the friction rod, the pointer remains deflected.
•Touch the sphere with your hand. The pointer returns to normal.
•When a high-voltage power supply is used then attach the capacitor plate to the positive pole of the power supply unit. Connect the negative pole
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