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62. Using Eq. 2926, we find that the net
y
component field is
22
01
02
3
/
2
3
/
2
12
,
2(
)
)
y
iR
B
Rz
µµ
ππ
=−
++
where
z
1
2
=
L
2
(see Fig. 2976(a)) and
z
2
2
=
y
2
(because the central axis here is denoted
y
instead of
z
).
The fact that there is a minus sign between the two terms, above, is due to
the observation that the datum in Fig. 2976(b) corresponding to
B
y
= 0 would be
impossible without it (physically, this means that one of the currents is clockwise and the
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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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