- #1
bcerge1
- 3
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I am trying to understand the magnetic dipole field via loop of wire.
The above pictures show how this problem is typically setup and how the field lines are typically shown.
The math is messy but every textbook yields the following:
β = ∇xA = (m / (4⋅π⋅R3)) ⋅ (2⋅cos(θ) r + sin(θ) θ)
The issue I am having is seeing how the above equation yields the field lines from the above picture.
If θ is referenced from the Z axis, and the loop of wire is on the X-Y axis, in my mind the field lines are 90 degrees shifted. In other words, when θ=0, the radial component is at it's max straight up the Z-axis, and as θ approaches π/2 the radial component approaches 0. The above picture shows that β is max at π/2 and not 0. In Matlab I plotted a few different Radii for all θ = 0 to 2π and Φ=0:
This picture is 90 degrees shifted from how I think it should be. Can someone help me understand this? Why does the equation not align up with the way the typical picture is shown? Am I incorrect in assuming the Z-axis is perpendicular to loop? Am i missing something? Am i not even close? D:
The above pictures show how this problem is typically setup and how the field lines are typically shown.
The math is messy but every textbook yields the following:
β = ∇xA = (m / (4⋅π⋅R3)) ⋅ (2⋅cos(θ) r + sin(θ) θ)
The issue I am having is seeing how the above equation yields the field lines from the above picture.
If θ is referenced from the Z axis, and the loop of wire is on the X-Y axis, in my mind the field lines are 90 degrees shifted. In other words, when θ=0, the radial component is at it's max straight up the Z-axis, and as θ approaches π/2 the radial component approaches 0. The above picture shows that β is max at π/2 and not 0. In Matlab I plotted a few different Radii for all θ = 0 to 2π and Φ=0:
This picture is 90 degrees shifted from how I think it should be. Can someone help me understand this? Why does the equation not align up with the way the typical picture is shown? Am I incorrect in assuming the Z-axis is perpendicular to loop? Am i missing something? Am i not even close? D: