How you will get resedual magnatism?

Answer 1

If the question is "How do you create residual magnetism", one simple answer is as follows... You can "induce" a magnet in ferrous (containing iron) material using another magnet. Take the item you wish to make into a magnet (can be done using a simple magnet and a nail, in home experiments). An old stereo speaker magnet is best as it is relatively easy to find and pretty strong. Rub the magnet evenly and repeatedly ONE WAY down the item you wish to be magnetized (like from the nail head towards the point), almost like you are sharpening a knife. The longer you do this, the better magnet you will create (based on the size and material in your item and the strength of the inducing magnet). Over time, this induction will dissipate and you will have to re-induce the item. A more efficient, and a tiny bit more difficult method is electromagnetic induction, in which you would use a battery and a copper coil wrapped around the nail to create a flow of electrons (current) through the nail resulting in simultaneous magnetism. You can find easy instructions on how to do this just about anywhere on the web. You can SEE this happening by using a magnet near an old TV set screen, the magnet will induce or change the flow of electricity and produce warped colors. Don't use the family TV set, though, the colors sometimes STAY messed up 8). Have fun experimenting 8)