P27_058.PDF
(
53 KB
)
Pobierz
Chapter 27 - 27.58
58. (a) Since
ρ
=
RA/L
=
πRd
2
/
4
L
=
π
(1
.
09
×
10
−
3
Ω)(5
.
50
×
10
−
3
m)
2
/
[4(1
.
60 m)] = 1
.
62
×
10
−
8
Ω
·
m,
the material is silver.
(b) The resistance of the round disk is
A
=
4
ρL
πd
2
=
4(1
.
62
×
10
−
8
Ω
·
m)(1
.
00
×
10
−
3
m)
=5
.
16
×
10
−
8
Ω
.
π
(2
.
00
×
10
−
2
m)
2
R
=
ρ
L
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