P30_024.PDF

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Chapter 30 - 30.24
24. We label these wires 1 through 5, left to right, and use Eq. 30-15 (divided by length). Then,
F 1 =
µ 0 i 2
2 π
1
d +
1
2 d +
1
3 d +
1
4 d
j= 25 µ 0 i 2
24 πd
j
=
(13)(4 π
×
10 7 T
m / A)(3 . 00 A) 2 (1 . 00 m)j
24 π (8 . 00 × 10 2 m)
·
=4 . 69
×
10 5 N / m ˆ j;
F 2 = µ 0 i 2
2 π
1
2 d +
1
3 d
j= 5 µ 0 i 2
12 πd
j=1 . 88
×
10 5 N / m ˆ j;
F 3 = 0 (because of symmetry); F 4 =
F 2 ;and F 5 =
F 1 .
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