How do I store a powerful rare earth magnet in order to block it's magnetic field?
366217
Unless you are exposing this magnet to CRT (display tubes like TV's or computers) I doubt that much will happen. DO NOT take it aboard anything that relies on a compass for navigation!  IF you need a box to store it in that will allow very little magnetic waves to escape, I suggest a soft iron box, or...couple the NORTH pole of the magnet to the SOUTH pole of the magnet with soft iron...that will get rid of most stray field. Sounds like a lot of work unless you really need this magnet.
860483
Yes.  You can use electricity to provide an orienting magentic field while you heat the metal then quickly cool it.  How permanently depends upon a few factors including the makeup of the steel.
31136
Hey I've always thought of it.\nIf you find one, just answer any of my questions in my Q&A (in order to contact me).\nGOOD QUESTION, anyway.\n\n\nI've always dreamt of using such a magnet for levitation.
343621
Try googling "magnetic levitation circuit"\n\nHere is one of the many hits I got.
110567
How to demagnetize materials\nPermanent magnets can be demagnetized in the following ways:\n\nHeat. Heating a magnet past its Curie point will destroy the long range ordering. \nContact. Stroking one magnet with another in random fashion will demagnetize the magnet being stroked, in some cases; some materials have a very high coercive field and cannot be demagnetized with other permanent magnets. \nHammering or jarring. Such activity will destroy the long range ordering within the magnet. \nBeing placed in a solenoid which has an alternating current being passed through it. The alternating current will disrupt the long range ordering, in much the same way that direct current can cause ordering. \nIn an electromagnet, ceasing the flow of current will eliminate the magnetic field. However, a slight field may remain in the core material as a result of hysteresis.\n\n[edit]\nTypes of permanent
985642
You try what the first poster suggests, but it isn't likely to work well. Besides the danger mentioned of doing damage to the equipment, you will have one of these problems that will prevent the result you want:\n1) the electromagnet won't be strong enough to have any demagnetizing effect at all, \nor,\n2) the electromagnet will completely demagnetize the permanent magnet.\n\nUsually magnetic catches consist of a flat steel plate that seats against two poles of the magnet. A better solution is to put a few layers of tape on the steel plate so that it does not come into contact with the pole pieces. Depending on the kinds of tape you have around, one layer might be enough.\nMagnetic force falls off very rapidly as you separate the surfaces.
509122
You can't.\n\nEven if you could, the minute you did, your computer would be as useful as a rock. It would lock up tight.
767003
a magnet would pick up the iron filings.
1161474
You can't. The polarity of a magnet is set. If you screw it up, sorry!
920912
Magnetization of materials\n\nFerromagnetic materials can be magnetized in the following ways:\n\n* Placing the item in an external magnetic field will result in the item retaining some of the magnetism on removal. Vibration has been shown to increase the effect. Ferrous materials aligned with the earth's magnetic field and which are subject to vibration (e.g. frame of a conveyor) have been shown to acquire significant residual magnetism.\n    \n* Placing the item in a solenoid with a direct current passing through it.\n    \n* Stroking - An existing magnet is moved from one end of the item to the other repeatedly in the same direction.\n    \n* Placing a steel bar in a magnetic field, then heating it to a high temperature and then finally hammering it as it cools. This can be done by laying the magnet in a North-South direction in the Earth's magnetic field. In this case, the magnet is not very strong but the effect is permanent.\nMagnetization of materials\n\nFerromagnetic materials can be magnetized in the following ways:\n\n* Placing the item in an external magnetic field will result in the item retaining some of the magnetism on removal. Vibration has been shown to increase the effect. Ferrous materials aligned with the earth's magnetic field and which are subject to vibration (e.g. frame of a conveyor) have been shown to acquire significant residual magnetism.\n    \n* Placing the item in a solenoid with a direct current passing through it.\n    \n* Stroking - An existing magnet is moved from one end of the item to the other repeatedly in the same direction.\n    \n* Placing a steel bar in a magnetic field, then heating it to a high temperature and then finally hammering it as it cools. This can be done by laying the magnet in a North-South direction in the Earth's magnetic field. In this case, the magnet is not very strong but the effect is permanent.
612302
You could build a set of fluid armor as seen in the Matrix movie.\n\nA simple magnetorheological fluid can be home-made out of small magnetic particles mixed with mineral or vegetable oil. Iron filings do not work well; they are too big. Good sources for small magnetic particles are:\n\n* magnetic inspection powder from welding shops\n* particles from burned steel wool (after mortar and pestle)\n* particles scraped from the surface of video tapes\n* particles "mined" from sand with a plastic bag and a magnet (see external links)\n\nThese fluids are not very stable, however. The particles will tend to clump and the fluid properties will be lost quickly. Fluids created for professional purposes use emulsifiers to suspend very small oily (octane or kerosene) magnetic particles in water. The particles are very fine; less than a micrometre in diameter.
1045884
http://en.wikipedia.org/wiki/Magnets\n\ngo there if u wanna find out, i only know simple version...
961497
Use the box top the magneto came in ,if you dont have that its .025 of an inch
706168
We can shape magnetic fields to trap things, but those things must be moving charged particles.\n\nHumans are not magnetic and even a very strong magnetic field will not restrain them at all.
417868
Your best bet would be to use water and make a salt water solution.  Using a magnet would work well unless you had a lot of iron fillings together and they were under some salt and all of them were pulled out of the mixture.  Then you would still have salt with the iron.  \n\nMake a aqueous(with water) solution, filter, and allow the water to evaporate.
145532
think of your harddrive like an old fashioned record.  It is basically a blank sheet until something is written to it.  A PC writes data to the disks of a hard drive by applying a magentic field to the surface of the disk and that forces the disk to orientate the surface into a certain pattern.  When the hard drive comes back around and attempts to get that data again it can detect in which order that data was written (1 or 0) and then the hard drive sends data to the rest of the pc to do whatever you want it to.\n\nDemagnetizing a drive is a way to use an extremely powerful magnet to force any data that has been written to the harddrive to "mess itself up" so that it is no longer readable.\n\nNot really practical for Joe User, but I do know that government, law offices and some medical groups will send old hard drives to companies to have them destroyed in this manner.
454527
wrap the bar in insulated copper wire, preferably solid core, keeping the wraps smooth and close together, and wrap three layers deep- when you reach the end of the first layer just wrap back towards the end you started at, same thing on third layer- them hook a DC power supply to the ends of the wire wrap, and let the thing run for 3-4 days (make sure when you hook it up that it doesn't heat much if any) pretty soon you've got a magnet.