5-32 Equation Reference
Straight Wire (7, 1)
The magnetic field calculation differs depending upon whether the point is inside or outside the wire.
Equation:
Example:
Given:
µ
r=1, rw= 0.25_cm, r=0.2_cm, I=25_A.
Solution: B= 0.0016_T.
Force between Wires (7, 2)
The force between wires is positive for an attractive force (for currents having the same sign).
Equation:
Example:
Given: Ia=10_A, Ib=20_A,
µ
r=1, L=50_cm, d=1_cm.
Solution: Fba=2.0000E–3_N.
B
µ
0
µ
r I
⋅ ⋅
2
π
r
⋅ ⋅
- - - - - - - - - - - - - - - - - - - - - - - -
=
F b a
µ
0
µ
r LI b Ia
⋅
⋅ ⋅ ⋅
2
π
d
⋅ ⋅
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ---------
=
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