P27_013.PDF
(
53 KB
)
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Chapter 27 - 27.13
13. The resistance of the wire is given by
R
=
ρL/A
,where
ρ
is the resistivity of the material,
L
is the
length of the wire, and
A
is its cross-sectional area. In this case,
A
=
πr
2
=
π
(0
.
50
×
10
−
3
m)
2
=7
.
85
×
10
−
7
m
2
.
Thus,
ρ
=
RA
L
=
(50
×
10
−
3
Ω)(7
.
85
×
10
−
7
m
2
)
=2
.
0
×
10
−
8
Ω
·
m
.
2
.
0m
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P27_003.PDF
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P27_002.PDF
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chap01
chap02
chap03
chap04
chap05
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