P26_008.PDF

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Chapter 26 - 26.8
8. (a) We use Eq. 26-17:
C =4 πε 0
ab
a =
8 . 99
C 2 (40 . 0mm
38 . 0mm) =84 . 5pF .
b
×
10 9 N · m 2
(b) Let the area required be A .Then C = ε 0 A/ ( b
a ), or
A = C ( b
a )
=
(84 . 5 pF)(40 . 0mm
8 . 85
38 . 0mm)
= 191 cm 2
.
ε 0
10 12 C 2
N
×
·
(40 . 0 mm)(38 . 0mm)
m 2
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