P27_004.PDF
(
56 KB
)
Pobierz
Chapter 27 - 27.4
4. (a) The magnitude of the current density vector is
J
=
i
A
=
i
πd
2
/
4
=
4(1
.
2
×
10
−
10
A)
=2
.
4
×
10
−
5
A
/
m
2
.
π
(2
.
5
×
10
−
3
m)
2
(b) The drift speed of the current-carrying electrons is
v
d
=
J
ne
=
2
.
4
×
10
−
5
A
/
m
2
=1
.
8
×
10
−
15
m
/
s
.
(8
.
47
×
10
28
/
m
3
)(1
.
60
×
10
−
19
C)
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P27_003.PDF
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P27_007.PDF
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P27_002.PDF
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Inne foldery tego chomika:
chap01
chap02
chap03
chap04
chap05
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