P27_067.PDF
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Chapter 27 - 27.67
67. (First problem of
Cluster
)
(a) We are told that
r
B
=
2
r
A
and
L
B
=2
L
A
. Thus, using Eq. 27-16,
R
B
=
ρ
L
B
πr
B
=
ρ
2
L
A
1
=8
R
A
=64Ω
.
(b) The current-densities are assumed uniform.
J
A
J
B
=
i
πr
A
i
πr
B
=
i
πr
A
i
=
1
4
.
1
4
πr
A
4
πr
A
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