tusenfem
Illuminator
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- May 27, 2008
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When the current goes through some conductor at some other "angle" than the force free one so that you have a curl component. Mostly applied to wire but flux tubes with helicity have this curl component.SolInvictus said:brantc, can you please tell us what the "right hand rule" is, in your own words?
Well, you might want to adjust this "explanation" of the "right hand rule." The only "right hand rule" I ever learned was to obtain the field around a current carrying wire or get the direction of the cross product and stuff like that. Actually, here is a nice page summing up a lot of "right hand rules."
But let us deduce some what you wrote:
- When the current goes through some conductor so far so fine
- at some other "angle" than the force free one HUH? What exactly does "force free" mean? It is a specific qualification in plasma physics. I basically means that, in the limit of negligible plasma pressure the equation JxB=0 holds, which means that the current is flowing along the magnetic field and one can write that μ0J= αB. In the case of zero current, this means that the magnetic field is a potential field B=grad(φ). And if the current is non-zere then we have curl(B) = αB and what then happens is whether α is a constant or a function of space. If it is a constant one deduces a Helmholtz equation for the magnetic field -▼2B = α2B
- so that you have a curl component. I don't know what that means, curl of what? I guess the magnetic field, but there is always a curl of the magnetic field, also in a force free setting as we see in the point above.
- Mostly applied to wire but flux tubes with helicity have this curl component. So, I guess you mean "twist" with "curl" and you mean "twist" with "helicity," because helicity is defined as the volume integral of the vector potential A dotted into the magnetic fiedl B.
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