Concepts covered

Permanent magnetsTemporary magnets


This task requires around 90 minutes.

You are watching: Three ways to demagnetize a magnet


Magnets room items v poles and also a magnetic field. This is due to the construction of that electrons. There space three steels that are naturally magnetic; iron, nickel, and cobalt. This metals enable the electron to configure in such a means that magnetic areas are created around them, and also it is this magnetic field in addition to the poles the the magnet, that allow magnets come attract and repel. Once two opposite poles are brought together, they will attract. However when the same poles are nearby their fields will repel each other.

But while we contact these permanent magnet, there really is nothing permanent around the fields. Every magnets can be demagnetized, and there room multiple ways to execute that. Momentary magnets room items that room magnetic but do not save their field as strongly. Items in this group include document clips, scissors, refrigerators, staples, and various various other items. This items space much more likely to shed their magnetic field than are irreversible magnets.

There are a few ways to eliminate a magnetic field from a permanent magnet. One of these techniques requires raising the temperature of the magnet. Another method to make a magnet lose its magnetic field is by hitting it.

Why carry out this in her classroom?

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


The next Generation science Standards for this task 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 several times, without any kind of paper, so closed staples slide out. Us will use these together our attracting items.Now we will usage the magnet to magnetize the bolts. Hold the bolt in the middle in one hand. Making use of your other hand, attach the magnet come the finish of the bolt. Background up, and also repeat.Take the magnet and also attach the other side of the magnet on the other side of the bolt so the you space attaching opposing pole on the other end of the bolt. This will magnetize both end of the bolt.To check the stamin of your newly created magnet, shot to lure some of the staples. Girlfriend should be able to pick up at least three close up door staples at the reminder of the bolt. If it doesn’t lure at the very least three, remagnetize her bolt till you can.Using the other bolts, create three much more weak magnets the same way. Usage the staples to confirm that all her bolts are around the exact same strength.Put one of your magnetized bolts in the freezer for at least 30 minutes. At the very same time, place one more one of her magnetized bolts top top a cookie paper in a 350 degree oven. Why can’t you usage a microwave to heat your nail?While wait for the bolts to with the ideal temperature, you have the right to test the effect of striking one of your magnetized bolts. Put a magnetized bolt level on a hammer for sure surface and ask a grown-up come hammer the bolt ~ above the table twenty times. Now, see how countless staples the bolt have the right to pick up.Now asking a grown-up to aid you remove the bolt native the toaster range using the cooktop mitt, and remove the bolt native the freezer using the tongs.Quickly check these two to check out how many staples they can pick up.Record your outcomes in a data table.Repeat your experiment.


What\"s happening?

Your results will rely on the stamin of the magnet you are using to rotate the bolts into magnets. Many of the bolts must be remarkable weaker, yet not all of them. Warmth and affect are two methods to demagnetize an item, so the bolt the were fight by the hammer and the bolt that was inserted in the oven need to both it is in weaker. But time and cold must not affect the bolts. So the control bolt and also the freezer bolt should both be around the exact same strength.

See more: Form A Sequence That Has Two Arithmetic Means Between -13 And 89.

When it pertains to the development of magnetic fields, the turn of a material’s unpaired electrons is the an essential element. In most materials, electrons spin randomly. However in magnets the electrons team into magnetic domains, produced whenever the spin of a number of electrons line up in the very 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 continue to be organized, the paperclips will certainly act choose magnets. However as quickly as your order is disrupted, by hammering them or by heater them up, the magnetism is dilute and/or lost until a magnet is offered to reorganize the electrons.