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[[File:Flux tube.png|300px|thumb|right|Sketch of a flux tube with magnetic field lines in red]] | |||
A flux tube is a region of space bounded by a [[Flux surface|flux surface]], i.e., a surface such that the magnetic field is everywhere perpendicular to the surface normal. | A flux tube is a region of space bounded by a [[Flux surface|flux surface]], i.e., a surface such that the magnetic field is everywhere perpendicular to the surface normal. | ||