Concepts covered

Permanent magnetsTemporary magnets


This task requires about 90 minutes.

You are watching: 3 ways to demagnetize a magnet


Magnets space items v poles and a magnetic field. This is as result of the configuration of its electrons. There space three metals that are normally magnetic; iron, nickel, and also cobalt. This metals allow the electron to configure in such a way that magnetic areas are created approximately them, and also it is this magnetic field in addition to the poles that the magnet, that permit magnets to attract and also repel. Once two the opposite poles are carried together, they will certainly attract. However when the same poles are nearby their fields will repel every other.

But when we call these long-term magnet, there yes, really is nothing permanent around the fields. Every magnets have the right to be demagnetized, and there space multiple methods to execute that. Short-lived magnets are items that room magnetic however do not store their ar as strongly. Item in this group include paper clips, scissors, refrigerators, staples, and also various various other items. These items room much much more likely to shed their magnetic ar than are long-term magnets.

There space a couple of ways to remove a magnetic ar from a permanent magnet. Among these methods requires boosting the temperature the the magnet. Another way to make a magnet lose its magnetic field is by hitting it.

Why do this in her classroom?

To encourage the following process skills for scientific investigation: prediction, observation, developing a hypothesis and also drawing conclusions.To help students recognize magnets and also what creates magnetism.To permit students to manipulate variables and also explore their very own questions.


The following Generation scientific research Standards for this activity are:

Primary: K-PS2-1, 2-PS1-1, 2-PS1-3, K-2-ETS1-3 Secondary: 3-PS2-1, 3-PS2-3, 3-PS2-4, Middle: MS-PS2-2, MS-PS2-3, MS-PS2-5 High: HS-PS3-5


StaplerStrong magnet (alnico)4 iron boltsRulerCompassMasking TapeHammerFreezerToaster ovenCookie sheetOven mittsTongs


Ask a grown-up come open and also close the stapler number of times, without any paper, so closed staples on slide out. Us will use these together our attracting items.Now us will usage the magnet come magnetize the bolts. Hold the bolt in the middle in one hand. Utilizing your other hand, affix the magnet come the end of the bolt. Background up, and also repeat.Take the magnet and attach the various other side of the magnet top top the other side that the bolt so the you space attaching the contrary pole on the other finish of the bolt. This will magnetize both ends of the bolt.To test the stamin of your newly created magnet, try to tempt some the the staples. Friend should be able to pick increase at the very least three close up door staples in ~ the guideline of the bolt. If it doesn’t attract at least three, remagnetize your bolt until you can.Using the various other bolts, develop three more weak magnets the exact same way. Usage the staples to confirm that all her bolts are about the very same strength.Put one of your magnetized bolts in the freezer because that at the very least 30 minutes. At the exact same time, place another one of your magnetized bolts on a cookie sheet in a 350 degree oven. Why can not you usage a microwave to warmth your nail?While waiting for the bolts to reach the best temperature, you can test the impact of striking one of your magnetized bolts. Lay a magnetized bolt level on a hammer for sure surface and also ask a grown-up to hammer the bolt ~ above the table twenty times. Now, see how countless staples the bolt deserve to pick up.Now ask a grown-up to assist you eliminate the bolt indigenous the toaster cooktop using the range mitt, and remove the bolt native the freezer making use of the tongs.Quickly check these 2 to view how countless staples they can pick up.Record your results in a data table.Repeat her experiment.


What"s happening?

Your outcomes will depend on the stamin of the magnet you room using to revolve the bolts into magnets. Many of the bolts have to be noticeable weaker, however not every one of them. Warm and affect are two means to demagnetize an item, for this reason the bolt the were fight by the hammer and also the bolt the was inserted in the oven must both it is in weaker. Yet time and also cold must not affect the bolts. For this reason the control bolt and also the freezer bolt must both be around the same strength.

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When it concerns the creation of magnetic fields, the rotate of a material’s unpaired electron is the crucial element. In many materials, electron spin randomly. But in magnets the electrons team into magnetic domains, created whenever the turn of a variety of electrons heat up in the same direction. This happens in iron, nickel, or cobalt. As soon as the bolts are inserted on the magnet, the bolts room being magnetized because their unpaired electrons room being organized. As lengthy as they stay organized, the paperclips will certainly act favor magnets. But as quickly as your order is disrupted, through hammering them or by heating them up, the magnetism is weakened and/or shed until a magnet is supplied to reorganize the electrons.