29-2
μ
0
=
4
π
×
10
−
7
T
⋅
m
/
A
≈
1
,
26
×
10
−
6
T
⋅
m
/
A
μ
0
=
4
π
×
10
−
7
T
⋅
m
/
A
≈
1
,
26
×
10
−
6
T
⋅
m
/
A