3B Scientific Kolbe's Electroscope User Manual
3B SCIENTIFIC® PHYSICS
Kolbe's Electroscope 1001027
Instruction Sheet
01/13 ALF
1 Scale
2 4 mm earth socket
3 Support with pointer
4 Top plate / Insulator
5 4-mm socket
6 Capacitor plate
1. Description
The electroscope is used for the detection of
electrical charges and voltages with high
sensitivity.
The electroscope consists of a metal housing
with a 4 mm socket for grounding purposes and
glass front and rear. The support for the pointer
with pivot bearing is attached electrically insulated to the top plate. The pointer is suspended
asymmetrically and so its weight delivers the
restoring moment. At the upper part of the
device there is a 4 mm socket which is
connected to the pointer support for mounting a
sphere and a capacitor plate. A scale allows
reading of the electrical charge.
For demonstration experiments the electroscope
is suitable for shadow projection.
2. Equipment supplied
1 Electroscope
1 Capacitor plate with 4-mm plug
3. Technical Data
Measuring range: 0 – 6 KV
Dimensions: 170 x 110 x 190 mm³
1
4. Friction rods and rubbing material
Friction
rods
Rubbing
material
Charge
polarity
PVC Plastic foil +
Acrylic
glass
Glass tube
Plastic rod
Plastic foil -
Newspaper,
leather
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.
6
5
4
3
2
1
0
Fig. 1 Charging the electroscope using a statically-
charged friction rod
6
5
4
3
2
1
0
Fig. 2 Charging a Faraday cup (1000972)
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com
Rights to amend technical specifications reserved
© Copyright 2013 3B Scientific GmbH
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