P31_005.PDF
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Pobierz
Chapter 31 - 31.5
5. (a) Table 27-1 gives the resistivity of copper. Thus,
R
=
ρ
L
A
=(1
.
68
×
10
−
8
Ω
·
m)
π
(0
.
10m)
π
(2
.
5
×
10
−
3
)
2
/
4
=1
.
1
×
10
−
3
Ω
.
(b) We use
i
=
|E|
/R
=
|
d
Φ
B
/dt
|
/R
=(
πr
2
/R
)
|
dB/dt
|
.
Thus
dB
dt
=
iR
πr
2
=
(10A)(1
.
1
10
−
3
Ω)
π
(0
.
05m)
2
×
=1
.
4T
/
s
.
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P31_003.PDF
(65 KB)
P31_002.PDF
(61 KB)
P31_001.PDF
(66 KB)
P31_007.PDF
(68 KB)
P31_005.PDF
(68 KB)
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