Role of air pressure in the force between currents | ||||||||
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Density of lines of the magnetodynamic field
arising from two parallel currents is more in the regions out of
the distance between the two wires and then the molecular magnetic
dipoles of air are pulled toward these regions and create a bigger
pressure there which causes the two wires to be pushed (or to be
attracted) toward each other. A similar reasoning applied
conversely to two antiparallel currents justifies their repulsion
arising from the created air pressure difference. Thus, most
probably, railgun will not work very well in the absence of the
air.
PACS: 41.90.+e
(23) Role of air pressure in the force between currents (pdf)