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68. We note that the distance from each wire to
P
is
rd
==
2
0 071
.
m. In both parts,
the current is
i
= 100 A.
(a) With the currents parallel, application of the righthand rule (to determine each of
their contributions to the field at
P
) reveals that the vertical components cancel and the
horizontal components add, yielding the result:
4
0
2
cos45.0
4.00 10 T
2
i
B
r
µ
−
⎛⎞
=°
=
×
⎜⎟
⎝⎠
π
and directed in the –
x
direction. In unitvector notation, we have
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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, Current

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