A magnet can lose its magnetism if exposed to high temperatures. If heated above the point called the Curie temperature, a magnet will lose its magnetism.
In general, steel nails will not remain "joined" if a magnet touching them is removed. It is important to note that nails affected by a magnet retain a weak "impression" of the field and remain slightly magnetic. But the magnetic field "impressed" on the nails will be quite small and will not hold the nails together once the magnetic is removed.
To demagnetize a permanent magnet, you can subject it to high temperatures, apply an alternating current (AC) magnetic field, or strike it with a hammer. These methods disrupt the alignment of magnetic domains within the material, causing the magnetism to be lost.
A compass is a device that uses a magnetic needle to show you which way is north, helping you navigate and find your way when you are lost.
A magnetized nail is a temporary magnet, known as an induced magnet. It becomes magnetized when it comes into contact with a permanent magnet, aligning its magnetic domains in the same direction. This temporary magnetism can be lost if the nail is no longer in contact with a permanent magnet.
The iron magnet lost its magnetism, possibly due to undergoing a physical change that disrupted its magnetic alignment. This change could have disrupted the magnetic domains within the iron, causing it to no longer exhibit magnetic properties.
go to a craft store and ask for the small magnet
Well, honey, if you put a magnet in a fire, it's gonna lose its magnetic properties. The heat messes with the alignment of the magnetic domains, making it about as useful as a screen door on a submarine. So, unless you're aiming to create a very expensive paperweight, I'd suggest keeping that magnet far away from the flames.
When a magnet gets wet, the liquid acts as an electrical conductor when moving through the magnetic field and produces a voltage. You can test this theory by dropping a magnet in a fish bowl and watching the fish float to the top. Don't worry, it is only a mild electric shock and the fish should start swimming around again within a minute or so.
The same way you destroy anything else. melt it in a furnace is the only way because if you chop it one end will be south and the other will be north If you mean "How do you remove the magnetism from a permanent magnet?" There are several ways. You can heat it past its Curie Point. For iron that is about 800C. Stroking one magnet with another in a random fashion will sometimes work. Hammering it will usually work.
Cutting a magnet in half will result in two smaller magnets, each with its own north and south poles. This happens because the magnetic properties are not lost when the magnet is cut.
When you turn off an electromagnet, the magnetic field it was producing disappears and the magnetism is lost. This is because an electromagnet relies on the flow of electric current to produce the magnetic field, and when the current is turned off, the magnetism is no longer sustained.
I don't know whether this really is the case. But if it is, I can imagine the moving magnet inducing currents in the pipe, resulting in movement energy being lost. (The currents will induce a magnetic field that opposes the movement.)