P27_026.PDF
(
57 KB
)
Pobierz
Chapter 27 - 27.26
26.Weuse
J
=
σE
=(
n
+
+
n
−
)
ev
d
, which combines Eq. 27-13 and Eq. 27-7.
(a) The driftvelocity is
v
d
=
σE
(
n
+
+
n
−
)
e
=
m)(120 V
/
m)
[(620 + 550)
/
cm
3
](1
.
60
×
10
−
14
/
Ω
·
10
−
19
C)
=1
.
73 cm
/
s
.
×
(b)
J
=
σE
=(2
.
70
×
10
−
14
/
Ω
·
m)(120 V
/
m) = 3
.
24
×
10
−
12
A
/
m
2
.
(2
.
70
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