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Forums
Engineering
Electrical Engineering
Calculating the flux density between two magnets
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[QUOTE="SteveDavies, post: 6293777, member: 672868"] Thanks essenmein. The problem was that I couldn't get any movement from the wire. I think it's because at 28 SWG it was too rigid and heavy. I didn't have a horseshoe magnet available, so I was using separate magnets. The Magnadur magnets are rated at 1 Tesla but according to supermagnete.de (I emailed them) the Tesla rating is measured at the centre of the magnet and at the surface it is always a lot less. Using their calculator, with the wire is at a distance of about 15mm from each magnet, it will have received a total field of about 0.1 Telsa. So, over a length of 50mm (the length of the magnet) and at a current of 0.5A you get: F = B I L F = (0.1) (0.5) (0.05) = 0.0025 N Which is equivalent to a mass of 0.25mg and is not enough to move the wire. There are a couple of videos on YouTube though where they have managed to get this to work, but I think the wire they are using is a lot thinner - more like piano wire. Thanks again for you suggestions, Steve. [/QUOTE]
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Electrical Engineering
Calculating the flux density between two magnets
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