Basic Electrostatics System
Model No. ES-9080
28
!
After some algebra and rearranging, you find that
where the ratio
is the dielectric coefficient :
Table 3.1: Some Dielectric Coefficients
Procedure 3D: Capacitors in Series and in Parallel
The purpose of this demonstration is to examine the effect of placing
capacitors in series and in parallel. You will need two capacitors of
known value (between 200 - 400 µF, to ignore the internal capacitance
of the electrometer), a DC voltage source, the electrometer, some
cables, and a double throw switch.
Material
Vacuum
1
Air
1.00059
Polystyrene
2.6
Paper
3.7
Pyrex
4.7
Mica
5.4
Porcelain
6.5
C
c
p
C
p
-------
C
E
V
i
V
–
f
C
p
V
i
+
C
p
V
f
--------------------------------------------
=
C
c
p
C
p
e
N
N
H
A
d
H
O
A
d
-----------
C
c
p
C
p
-------
=
=
N
1
1
8
<
8
=
8
<
8
=
9
:
9
:
Figure 3.7: Circuit Diagrams
3.7a Series
3.7b Parallel
