okay here we have a speaker magnet okay and screwdriver and let's try to magnetize and demagnetize the screwdriver you have a few screws here let's see first of who was doing so it's picking up one but it's not picking up the second one so it's pretty demagnetized let's see it picks up the large one also but it's not picking up two small ones okay now if I simply touch it then it will be magnetized now it should pick up much more it's gonna attract it to it two three and it picks up almost four picks up on four okay so that is magnetized not to demagnetize it we have to introduce it exactly in the center don't touch the side because being a magnet it will be attracted to it so introduce it into the center move it forward backward a little bit and it should lose its magnetic properties not entirely but it's picking up one and it's barely pinging up or not at all the second one so it was demagnetized one and it cannot pick up the second one okay if you simply touch it it will be magnetized again so two three and almost for so it's magnetized four screws introduce it into the middle don't touch the sides and it should demagnetize it oops I want the closer it might be magnetized again so it's in the middle okay let's try it now yep it's barely barely or not at all whoops I pick up two cannot pick up more so it was partially at least demagnetized let's try it once again more movements in the center and it's not totally demagnetized but it's not picking up the second small screw okay that's it magnetizing and demagnetizing a screwdriver using a speaker or magnet