P26_075.PDF

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Chapter 26 - 26.75
75.(a) C = ε 0 A/ ( d
b ), the same as part (a) in problem 74.
(b) Now,
U
U
2 C V 2 = C
ε 0 A/d
ε 0 A/ ( d
b ) = d
b
=
=
.
C
d
(c) The work done is
W =∆ U = U
U = 1
2 ( C
C ) V 2 = ε 0 A
2
1
d
b
1
d
V 2 =
ε 0 AbV 2
2 d ( d
b ) .
Since W> 0the slab must be pushed in.
1
2 CV 2
1
643283266.001.png
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