P27_042.PDF
(
56 KB
)
Pobierz
Chapter 27 - 27.42
42. (a) Since
P
=
i
2
R
=
J
2
A
2
R
, the current density is
J
=
1
A
P
R
=
1
P
ρL/A
=
P
ρLA
A
=
1
.
0W
10
−
3
m)
2
=1
.
3
×
10
5
A
/
m
2
.
π
(3
.
5
×
10
−
5
Ω
·
m)(2
.
0
×
10
−
2
m)(5
.
0
×
(b) From
P
=
iV
=
JAV
weget
V
=
P
AJ
=
P
πr
2
J
=
1
.
0W
10
5
A
/
m
2
)
=9
.
4
×
10
−
2
V
.
π
(5
.
0
×
10
−
3
m)
2
(1
.
3
×
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