Understanding Particle Movement in a Magnetic Bottle: Field vs. Field Lines

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SUMMARY

Particles trapped in a magnetic bottle travel around the magnetic field rather than individual magnetic field lines. The density of the magnetic field influences the particle's movement, while the magnetic field itself does not exert force on the particles; instead, it alters their direction. The width of the spirals formed by the particles is determined by their momentum orthogonal to the magnetic field. Oscillation occurs due to the particle's velocity and the axial force acting on it.

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Samson4
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Which is correct? It's almost split 50/50 when I search online. Do the particles trapped in a magnetic bottle travel around the magnetic field or around each magnetic field line? It makes more sense for them to travel around the field because the field is what changes in density not each line. Is this correct?

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You cannot count field lines. The width of their spirals depends on their momentum orthogonal to the magnetic field.
 
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Magnetic field does not work on the particle trapped in the magnetic bottle, it just changes their direction. It is the velocity of the particle itself and the force in the axial direction which causes the oscillation.
 

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