3B Scientific Electrometer (115 V, 50__60 Hz) User Manual
Page 7
Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany •
www.elwedidactic.com
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •
www.3bscientific.com
Technical amendments are possible
© Copyright 2008 3B Scientific GmbH
charge is within, and “wipe” the charge onto the
inner surface of the cup.
•
Use the relationships given below to calculate the
charge that has been transferred.
•
For a capacitor of capacitance C, the relationship
between the charge Q and the voltage U is:
U
C
Q
⋅
=
•
Since
U
OUT
=
U
IN
, the output voltage from the
electrometer gives a measure of the charge
Q:
C
U
Q
OUT
⋅
=
•
The capacitor U8403501 has the known capacitance
C = 10
nF, and therefore the charge can be
calculated.
Fig. 1
Experiment set-up for measuring charges in electrostatics
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