P27_057.PDF

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57. (a)
i
= (n
h
+
n
e
)e = (2.25
×
10
15
/s
+ 3.50
×
10
15
/s)(1.60
×
10
−19
C) = 9.20
×
10
−4
A.
(b) The magnitude of the current density vector is
J
=
9.20
×
10
−4
A
i
2
= 1.08
×
10
4
A/m
.
=
−3
m)
2
A
π(0.165
×
10
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