I basically know how magnets are made, but combining permanent magnets with ie. iron…
First, is the magnetic field multiplied if you emerge a magnet with an iron plate? Is it even more “magnified” if you have iron on both poles?
Ok, if you place a dozen magnets the same pole facing the same direction inside a cylinder and a bigger cylinder with repelling poles around the first one, will you get a magnetic bearing? If that is the case, is the bearing very unstable/impractical in slow speeds?
Can one of the poles be inside iron/magnet material? This seems unlikely:eek:
What would happen to a magnet if someone glued two repelling poles together?
It’s tough to make a magnetic bearing, because any arrangement of permanent magnets is unstable. Balancing one magnet against another is like trying to balance a pencil on its point: Any disturbance to one side or the other will result in it falling over, or slipping over to one side, or something of the sort. You can, however, stabilize things with a single very low-friction point of physical contact. You can also make magnetic bearings using superconductors, which have a constantly-changing field unlike that of a permanent magnet (but the drawback there is that all known superconductors require very cold temperatures).
If you glue two repelling poles together, you’ll still have a magnet, but it’ll be a quadrapole magnet instead of a dipole magnet. The main consequence of this will be that the magnetic field will fall off much more rapidly with distance. Those semi-flexible sheets of refrigerator magnets are often made this way, with alternating bands of opposite polarity. When they’re right up against your refrigerator, they stick just as well as a dipole magnet, but if you hold them, say, a centimeter away, they’ll be much less attracted than the dipole at one cm would be.