If this is true, then how can I make one? Or where, on the web, would be good to find info on magnets?
2006-06-22 13:58:55 · 4 answers · asked by lorenzo 1 in Science & Mathematics ➔ Astronomy & Space
a copper disc works also, When spinning fast the magnetic field is reflected back and the magnet will float off.
2006-06-22 19:01:25 · answer #1 · answered by Anonymous · 9⤊ 4⤋
If you spin a sheet of conducting material like aluminium near a magnet, an electric current starts to flow in the sheet. This produces a magnetic field which drags the magnet round in the same direction. This is how a car speedometer works. A cable is fixed to an axle. As the axle rotates, the cable rotates with it.The other end of the cable goes into the back of the speedometer, and a magnet is fixed to the cable and rotates with it.In front of the magnet is an aluminium disc.The rotating magnet tries to drag the disc round with it, but a spiral spring restrains the disc. The faster the magnet rotates, the bigger the angle the disc is twisted through. The speedo needle is fixed to the disc, so the faster the car wheels rotate, the more the needle is deflected, and you've got a speed indicator.
2006-06-22 15:04:01 · answer #2 · answered by zee_prime 6 · 0⤊ 0⤋
That sheet of aluminum would have to be cooled down to almost absolute zero...the average garage mechanic or basement bomber would not have much of a chance. I believe your reference is in regards to Bose-Einstein condensates which do have some rather unique properties as far as magnetism and other fundamental forces are concerned.
2006-06-22 14:09:43 · answer #3 · answered by Shaula 7 · 0⤊ 0⤋
i got no idea for that
2006-06-22 14:01:30 · answer #4 · answered by john 3 · 0⤊ 0⤋