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77.
(a) Since
u
=
1
2
κε
0
E
2
, we select the material with the greatest value of
κE
2
max
,where
E
max
is its di
electric strength. We therefore choose strontium titanate, with the corresponding minimum volume
V
min
=
U
U
max
=
2
U
κε
0
E
2
max
=
2(250 kJ)
(310)
(
8
.
85
×
10
−
12
C
2
N
·
m
2
)
(8 kV
/
mm)
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 Fall '08
 SPRUNGER
 Physics

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