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Replace the fuse and reinsert the holder in
•
its socket.
Fig. 3: Changing the fuse
8. Care and maintenance
•
Before cleaning the equipment, disconnect it
from its power supply.
•
Use a soft, damp cloth to clean it.
9. Disposal
•
The packaging should be disposed of at
local recycling points.
•
Should you need to dispose of the equip-
ment itself, never throw it away in normal
domestic waste. Local regulations for the
disposal of electrical equipment will apply.
Elwe Didactic GmbH ▪ Steinfelsstr. 5 ▪ 08248 Klingenthal ▪ Germany ▪ www.elwedidactic.com
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com
Determination of the specific charge of an
electron e/m
•
•
•
•
The slope of the line through the origin corre-
sponds to e/m.
600
400
200
Fig. 4 Graph of r
Subject to technical amendments
© Copyright 2012 3B Scientific GmbH
10. Sample experiment
Select the current passing through the coils
so that the radius of the circular path is for
example 5 cm. Note the set current value.
Decrease the anode voltage in steps of 20 V
to 200 V. In each case, set the coil current I
so that the radius remains constant. Take
down these values.
Record other series of measured values for
radii of 4 cm and 3 cm.
For further evaluation, plot the measured
values in a graph of r
2 / V
U
0
0
10
2
2
against 2U for values as meas-
B
ured (black: r = 5 cm, red: r = 4 cm, green:
r = 3 cm)
2
2
against 2U.
B
20
30
2
2
2
B r
/ mT cm
H
40
2
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