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3B Scientific Kolbe's Electroscope User Manual

Page 2

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3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪

www.3bscientific.com

Rights to amend technical specifications reserved

© Copyright 2013 3B Scientific GmbH

4. Friction rods and rubbing material

Friction
rods

Rubbing
material

Charge
polarity

PVC

Plastic foil

+

Acrylic
glass

Plastic foil

-

Glass tube

Newspaper,
leather

+

Plastic rod

Wool, textile
fibers

-


5. Operation

5.1 General notes

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).

5.2

Charging up the electroscope by
touching it with a statically charged body

Attach the capacitor plate to the
electroscope.

Rub the friction rod (e.g. 1002709) with the
suitable material (PVC or acrylic rods e.g.
with plastic foil).

Touch the capacitor plate with the charged
rod. The pointer deflects.

Remove the friction rod, the pointer remains
deflected.

Touch the capacitor plate with your hand.
The pointer returns to normal.

5.3 Using electrostatic induction to charge

up the electroscope

Approach but do not touch the capacitor
plate with the statically charged friction rod.
The pointer deflects.

Remove the friction rod. The pointer returns
to normal.

Again approach the capacitor plate with the
statically charged friction rod. Once again
the pointer deflects.

Briefly touch the capacitor plate with your
finger to discharge it. The pointer deflection
disappears and returns to normal.

Now remove the friction rod. The pointer
again shows deflection.

0 1

2

3

4

5

6

Fig. 1 Charging the electroscope using a statically-

charged friction rod

0 1

2

3

4

5

6

Fig. 2 Charging a Faraday cup (1000972)