If you want a strong magnet, the obvious answer is to buy one. However, for a variety of reasons, you might want to combine several smaller magnets. There are a few ways to do this, but the Halbach ...

Quad-cotter floating in the air by "rotating magnet" rather than "rotating wing" was created. This mechanism"Hyper loop concept" running at 1,200 km / hAlthough it does not fly high, it is also used ...