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3. Operation
The electroscope is charged using friction rods
(e.g. 1002709) statically charged by various
friction-inducing materials, or using a high-voltage
power supply unit (e.g. 1003309 or 1003310).
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).
3.1 Charging 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
Fig. 1 Left: Charging the electroscope using the high-voltage power supply 1003309 / 1003310
Fig. 2
Right: Charging the electroscope using electrostatic induction
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪
3.2 Using electrostatic induction to charge up
Subject to technical amendment
© Copyright 2018 3B Scientific GmbH
pole of the power supply unit. Connect the
negative pole with the earth socket on the
power supply and with the earth socket on the
electroscope.
Use a charge spoon (e.g. 1002707) to draw a
charge from the capacitor plate and transfer it
to the electroscope
the electroscope
Approach but do not touch the sphere (or
capacitor plate) with the statically charged
friction rod. The pointer deflects.
Remove the friction rod. The pointer returns
to normal.
Again approach the sphere with the statically
charged friction rod. Once again the pointer
deflects.
Briefly touch the sphere with your finger to
discharge
it.
The
disappears and returns to normal.
Now remove the friction rod. The pointer
again shows deflection.
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pointer
deflection
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