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If desired, this expression can be simplified to read
B
i
r
ar
ab
=
−
−
F
H
G
I
K
J
µ
0
22
2
π
.
(d) Outside the coaxial cable, the net current enclosed is zero. So
B
= 0 for
r
≥
a
.
(e) We test these expressions for one case. If
a
→ ∞
and
b
→ ∞
(such that
a > b
) then
we have the situation described on page 696 of the textbook.
(f) Using SI units, the graph of the field is shown below:
93. (a) Eq. 2920 applies for
r < c
. Our sign choice is such that
i
is positive in the smaller
cylinder and negative in the larger one.
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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