why does dirt stick to magnets?
114879
Obviously because it's metalic : )
210510
No, because you might have other forces acting on the object such as magnetic force and gravity.
1045884
http://en.wikipedia.org/wiki/Magnets\n\ngo there if u wanna find out, i only know simple version...
648293
This is a magnetic flywheel.  The spinning magnets will induce a voltage across the coil of wire.  If you draw current from the wire, that current will induce a magnetic field which will exert a torque on the magnets, slowing them down.  The total electrical energy you can get out of the system will never exceed the initial kinetic energy of the rotating magnets.\n\nThe thing slowing down the magnets is not friction, it's an electromagnetic force, and even if you eliminate friction completely, the magnetic torque will spin down your magnets quite handily as soon as you start extracting energy from the system.
1137048
Well it is certainly not a "perpetual motion" type of device. Magnets gradually lose their magnetism as their "disorder" increases. Their "disorder" increases when they contribute to "order" in ferrous objects in their proximity. Need to increase the "order" in your magnet? Wrap a coil around it and connect it to a DC source. Different materials will "retain" different amounts of residual magnetism ("order") after the power source is switched off. Natural magnets would have been exposed over centuries to small, but significant electrical stresses during their formation. They too would gradually lose it as their "disorder" increases. To answer your question - magnets owe it to electrical energy imprinted in ferrous memory.
1098861
a copper disc works also, When spinning fast the magnetic field is reflected back and the magnet will float off.
1123749
Hey there:\n\nInteresting question, because a month ago, i stumbled upon a thrown away harddrive while walking my dog.  I desembled it while I was at home, and found inside it TWO EXTREMELY POWERFULL RARE EARTH MAGNETS.  Also, around on each side of these magnets, was a magnetic shield, that did not allow them to attract from one side, but yes from the other.  If I was you, look for any thrown away harddrive, they all have them, and you will also be getting an extremly powerfull magnet while you are at it.
1070520
Try this. Iron when combined with other metal elements becomes non-magnetic, yet with varying of the same elements is quite attracted to the magnet.Name the divisions of the metals and explain why.
85373
Magnetic force........
866029
Strong and patented super magnets usually do not or never wear out and do not lose their magnetic charge so permanent use for a long period is guaranteed. Hard chromium coated magnets are known to be good.\n\nThere are also kinds of magnets  like an ordinary ceramic magnets which lose their magnetic charge with time or when exposed to heat. Just be careful in choosing the kind of magnet  itself.♥
767003
a magnet would pick up the iron filings.
441253
It has to do with the alignment of charge due to unidirectional striking force- The same thing will happen to any iron bar after a hard strike-the force generated causes (usually temporary) alignment of enough atoms to generate magnetism. In a normal bar of iron, the atoms are aligned more or less at random, so there is no cumulative directional magnetic force- Any time a significantly large proportion of atoms are aligned together, the summation of the electromagnetic charges can be detected.  Rotating a piece of metal will not induce magnetic charge.  Exposing iron to an extremely powerful magnetic field will, because it will cause alignment of the atoms in the iron, but the magnetic field of the Earth (inside, outside, everywhere) is extremely weak.
80341
regular magnets are natraly magnitised, they maintain their magnetic properties with out aid of an outside force\nelectro magnets use a coil of wire, with a curent passing through it, wraped around a piece of metal to create the magnitism. when you remove the curent, it loses its magnetism.
486884
Magnetism is the property of magnetic materials to exert forces of certain objects, mainly iron and other magnetic materials; this force is known as the magnetic force.\n\nThe origin of this force is the movement of electrons or charged particles (ions) inside the materials.  When an electron spins around the atom's nucleus, according to the Biot-Savart Law it produces what we call a Magnetic Field, which exerts Magnetic Induction on it's surroundings.  Not only that, but also moving electrons in the surroundings of the original one (say, electrons of another object) will "feel" this induction as a force.\n\nSo, everything exerts a magnetic force on everything else, but the thing is that the magnetic induction and hence the direction of the force electrons in the surroundings will feel depend on the direction in which the original electron is moving (more specifically, on the vector Angular Momentum and/or the vector Magnetic Moment), and since there are lots of electrons moving in different directions in every material, the forces will point in every direction, cancelling themselves and producing a net force equal to zero.\n\nBut magnetic materials have the property of "aligning" the Angular Momentum/Magnetic Moments of all its atoms, and the forces produced by all its electrons (in the average) point in the same direction, producing the net force we feel when we put a magnet (magnetic material) near some piece of iron (a material susceptible to magnetism).\n\nHope I helped
27845
Magnetism is caused by  electrical charges in motion. This is not necessarily something unique to electrical equipment, which is the case for electromagnetism, but also for permanent magnets. It is the motion of the electrons around the nuclei, and also the spin of the electrons, that cause the magnetism in a natural magnet. The magnetic field of Earth is believed to come from movements inside the planet, where oceans and rivers of melted metals exist.\n\nI can only think of two types of magnet; natural magnet and electro-magnet.
499183
A magnetic compass works because the Earth is like a giant magnet, surrounded by a huge magnetic field. The Earth has two magnetic poles which lie near the North and South poles. The magnetic field of the Earth causes a magnetized 'needle' of iron or steel to swing into a north-south position if it is hung from a thread, or if it is stuck through a straw or piece of wood floating in a bowl of water.
871131
If you are checking in the field, take a small magnet with you. The 304 will attract the magnet. 316 will not cause a magnet to stick.