In the last experiment, you made a screwdriver magnetic. But is that change permanent? What if you wanted a non-magnetic screwdriver again. Is there any way to remove the magnetization? In other words, once you've lined up the atomic magnets, is there any way to make them all disorganized again? Yes, there are a couple of easy ways to do this, but you need to put some energy into the screwdriver blade. You can whack it with a hammer, which disorders the tiny atomic magnets. But this might damage the screwdriver, so it's not the recommended method. You can also heat the screwdriver blade to demagnetize it. Hold the handle with an oven mitt, and touch the blade of a magnetized screwdriver to the burner of an electric stove for about a minute, or put it in the flame of a gas stove for the same amount of time. The blade will get very hot, so don't touch it until it has cooled for about five minutes. Then you should find that it has become an un-magnet, and doesn't pick up paper clips any more!
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