63. Using A = πr
2
with r = 5
× 10
−4
m with Eq. 27-5 yields
|
J
| =
i
A
= 2.5
× 10
6
A/m
2
.
Then, with
|
E
| = 5.3 V/m, Eq. 27-10 leads to
ρ =
5.3 V/m
2.5
× 10
6
A/m
2
= 2.1
× 10
−6
Ω
·m .
63. Using A = πr
2
with r = 5
× 10
−4
m with Eq. 27-5 yields
|
J
| =
i
A
= 2.5
× 10
6
A/m
2
.
Then, with
|
E
| = 5.3 V/m, Eq. 27-10 leads to
ρ =
5.3 V/m
2.5
× 10
6
A/m
2
= 2.1
× 10
−6
Ω
·m .