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17. Using the result of problem 12 and Eq. 3012, we wish to show that
2
√
2
µ
0
i
πa
>
µ
0
i
2
R
,
or
4
√
2
πa
>
1
R
,
but to do this we must relate the parameters
a
and
R
. If both wires have the same length
L
then the
geometrical relationships 4
a
=
L
and 2
πR
=
L
provide the necessary connection:
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 Fall '08
 SPRUNGER
 Physics

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