Could a moebus strip carved from a single block of iron be magnetized?
140684
I guess it can be magnetized. I don't think there would be any problem even if its in the form of a moebus strip, or any form at all. Anyway I am curious for other answers.
1135256
Conduction?  I'm not aware of magnets having such a property.
561277
MAGNET THATS POWERED BY ELECTRICITY
205505
Magnetic core.  Molten Iron.
268419
Methods\n\n\nDiamagnetism\n\nA substance which is diamagnetic repels a magnetic field. Earnshaw's theorem does not apply to diamagnets since they behave in the opposite manner of a typical magnet (relative permeability μr < 1). All materials have diamagnetic properties, but the effect is very weak, and usually overcome by the object's paramagnetic or ferromagnetic properties. A material which is predominantly diamagnetic will be repelled by a magnet, although typical objects only feel a very small force. This can be used to levitate light pieces of pyrolytic graphite or bismuth above a moderately strong permanent magnet. As water is predominantly diamagnetic, this property has been used to levitate water droplets and even live animals, such as a grasshopper and a frog. The magnetic fields required for this are very high, however; in the range of 16 teslas, and create significant problems if ferromagnetic materials are nearby.\n\n\n\n\nSuperconductivity\n\nDue to the Meissner effect, a superconductor also expels magnetic fields (μr = 0), much better than a diamagnet. Due to this (and flux pinning) the magnet is held at a fixed distance from the superconductor or vice versa. This is the principle in place behind EDS (electrodynamic suspension) magnetic levitation trains.\n\n\nFeedback control systems\n\nIf the position and trajectory of the object to be levitated can be measured, the field of nearby electromagnets (or even the position of permanent magnets) can be continuously adjusted via feedback control systems to keep the levitated object in the desired position.\n\nThis is the principle in place behind common tabletop levitation demonstrations, which use a beam of light to measure the position of an object. The electromagnet (arranged to pull the ferromagnetic object upwards) is turned off whenever the beam of light is broken by the object, and turned back on when it falls beyond the beam. This is a very simple example, and not very robust. Much more complicated and effective measurement, magnetic, and control systems are possible.\n\nThis is also the principle upon which EMS (electromagnetic suspension) magnetic levitation trains are based. The train wraps around the track, and is pulled upwards from below.\n\n\nOscillating fields\n\nA conductor can be levitated above an electromagnet with a high frequency alternating current flowing through it. This causes any regular conductor to behave like a diamagnet, due to the eddy currents generated in the conductor. Since the eddy currents create their own fields which oppose the magnetic field, the conductive object is repelled from the electromagnet.\n\nThis effect requires high frequencies and non-ferromagnetic conductive materials like aluminium or copper, as the ferromagnetic ones are attracted to the electromagnet.\n\n\nHalbach arrays\n\nAnother way of stabilizing the repulsive effect is to use fields that move in space, rather than just time. This effect can be demonstrated with a rotating conductive disc and a permanent magnet, which will repel each other.\n\nThis is the principle of the Inductrack maglev train system, which avoids the problems inherent in both the EMS and EDS systems. It uses only permanent magnets (in a Halbach array) and unpowered conductors to provide levitation. The only restriction is that the train must already be moving at a few kilometers per hour (about human walking speed) to levitate. The energy for suspension comes entirely from forward motion, efficiency is good, and no extremely low temperature suspension magnets are required.\n\nHalbach arrays are also well-suited to magnetic levitation of gyroscope, motor and generator spindles.\n\n\nGyroscopic motion\n\nThe reason a permanent magnet suspended above another magnet is unstable is because the levitated magnet will easily overturn and the force will become attractive. If the levitated magnet is rotated, the gyroscopic forces from spinning and precession can prevent the magnet fro
1142672
A few magnets will do the trick.... even a really large scientific one.
883128
Use a magnet. Iron is attracted to it, lead is not.
669781
Magnetic property of a material is due to the arrangement of Domains in it. If you are not of science background, simply think it as it is the arrangement of atoms of the material, which is responsible for its magnetism. If you provide a permanent magnet with electric supply, the arrangement of atoms in it will be disturbed resulting in loss or decrease in its magnetism.\nNot only the electric supply, but heating or even strong jerks can also lead to the disturbed atomic arrangement and therefore decreased or completely lost magnetism.
1161474
You can't. The polarity of a magnet is set. If you screw it up, sorry!
591035
Ferromags are substances that are strongly attracted by a magnetic substance. Some ferromagnetic  metals are iron, cobalt, nickel, gadolinium and dysprosium. To generate electricity from ferromags, take two iron sheets 5 cm wide. rub both of them using a bar magnet only in one direction for about 10 minutes. This will impart magnetic properties to d iron sheet. Then u arrange the sheets in such a way that u feel d force of attraction between the sheets. take a copper wire. make a loop out of it. rotate d loop in d space between d sheets with a constant frequency. Voila electricity generated at d ends of d loop
920496
One theory of why a material, capable of being magnetised, becomes magnetic (i.e., attracts ferrous material), is that the individual, but randomly distributed 'domains' within are lined up (by some exterior force - e.g., magnetic field from a coil,  'stroking' with an already magnetised piece of iron/streel, etc.), so that the domains line up. The summation of their individual magnetic fields effectively produces one large magnetic field in  the material and makes what we call a magnet!   Some materials, after this process, retain their magnetism and are called permanent magnets, others, such as relay cores, once the external force is removed, exhibit very little residual magnetism.
575926
Back in the 1960s, nearly all watches were mechanical, and some of the moving parts were made of steel.   A strong magnetic field would gum up the works, slow them down or even stop them.   But a magnet won't harm an electronic watch with no moving parts, like a digital watch.   These days, only top-end-of-the-market watches like Rolex and Omega have moving parts.   Just down the road from us is an aluminium smelter which offers guided tours to the public.   The potline where the aluminium is smelted electrically draws very heavy current; about 200000 amps.   The bus bars that carry the current have a very strong magnetic field around them.   One of the tricks the guide performs is to hold a steel crowbar and the magnetic field whips it out of his hands and it flies across the room.   They tell you to hand your watches in before entering, even though about 90% of them wouldn't be affected.   It's a whole lot simpler and less error-prone than checking each individual watch.
1180717
It truly depends on the amount of Iron in the magnet as to the strength and the base material that it is made of.  Some of those cheap rubbery refrigerator magnets will deteriorate or dry rot over a period of years and thus lose it's quality.  \n\nHow ever a good solid high iron ore magnet will easily out live you.  (with proper care)
805479
Get two pieces of iron block. Turn a coil round one of them. Pass electric current through the one which has the coil turned round it. This will make the coiled piece of iron act like a magnet and will attract the other piece of iron. And you have made an electromagnet.
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.
304336
No there is no substance which can block magnetism except another magnet.  You can block electromagnetic energy quite easily depending on the strength.
41444
There are some natural magnets. For example, the mineral magnetite is magnetic, and is found in lodestones. \n\nIf you have a magnet, you can stroke a piece of metal (not all metals, but some) and magnetize it; that is, turn it into a magnet. You line up the magnetic domains when you stroke it so it has a net magnetic field. If you put a radio reciever nearby tuned to the right frequency, you can hear the domains flip as you do this; this is called the Barkhausen effect. \n\nThere are also electromagnets. Passing an electric current through a coiled wire wrapped around the right kind of metal (called a shunt) produces a magnet. This is the kind of magnet one finds in MRI machines.