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6mile longwire
Hal Rosser wrote:
Jimmie The wire cutting through the magentic field will generate an EMF - a potential difference between one end of the wire and the far end but there is no complete circuit to tap it. If a return wire were connected to the far end of the wire, it would generate the same value and polarity giving no net emf (voltage) around the path. If one could create a loop and rotate it in the field that would be a different matter. The same concept applies to the voltage developed between the wing tips of a (metal) aircraft. My post was about a possible trailing loop. (Both ends accessable to the ham on board.) You don't have to rotate the loop - just to move it. The aircraft is moving - thus the magnetic lines get 'cut' so to speak, so emf gets generated. I also heard it worked 'too well' on the shuttle - that the current was so great that the wire burned into. you can get charging and arcing in orbit from lots of other sources (impact with charged particles, for instance). It's a pretty big issue with large things like ISS that can build up substantial charge if things aren't bonded together. More than one spacecraft has been lost due to this kind of thing (Japan's Midori-2 is one case I know of). http://www.space.com/spacenews/archi...ch_111103.html Jim |
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