Simple.
With a magnet. The iron dust will simply be attracted to the magnet.
To collect the iron dust neatly, get a plastic sandwich bag or a small plastic baggie, put the magnet inside, use it to collect the iron dust, then turn the bag inside-out and remove the magnet.
With a magnet. Iron scraps will be attracted to a magnet, while matchsticks will not. Alternate answer; drop them in a pan of water. If the matchsticks are wood, they'll float, while the iron scraps will sink.
Dust can be separated from air using methods such as filtration, gravitational settling, or electrostatic precipitation. Filtration involves passing the air through a filter media that captures the dust particles. Gravitational settling allows the dust to settle out of the air due to gravity, while electrostatic precipitation uses an electric field to attract and collect dust particles.
You would see an electromagnetic separation of iron in recycling facilities or metal processing plants, where electromagnets are used to separate iron materials from other types of metals or materials.
A transformer consists of two separate coils of wire wrapped around an iron ring. The primary coil induces a changing magnetic field in the iron core, which in turn induces a voltage in the secondary coil. This allows for the transfer of electrical energy between the two coils.
Iron and other metallic objects can be separated using a magnet. The magnet will attract the iron and other ferrous materials, allowing them to be easily separated from non-metallic materials.