5. (a) The capacitance of a parallelplate capacitor is given by
C
=
ε
0
A
/
d
, where
A
is the
area of each plate and
d
is the plate separation. Since the plates are circular, the plate area
is
A =
π
R
2
, where
R
is the radius of a plate. Thus,
()
( )
2
12
2
2
10
0
3
8.85 10
F m
8.2 10 m
1.44 10
F 144pF.
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 Spring '08
 Any
 Physics, Capacitance

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