I have a solid metal bar, made of iron, dimension is 5 in long, 3 inch wide and 1 in thick. I used it as a paper weight in my office. I want it to be magnetic so it's can easily pick up staple wires that I removed from my files. Thank to those who will give solution to my question.
204912
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.
15823
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.
4150
Does iron lose magnetism when combining with oxygen?\nProbably not.\n\nIs magnetism a chemical property?\nMagnetism has a relationship with electricity. Electricity is caused by charges of atoms.\nIf a substance is insulative, current electricity will not occur but static electricity will occur.\nIf a substance is conductive, vice versa.\nTherfore, magnetism is a chemical property.\n\nHow to weaponize blood-borne iron?\nBlood is very weak in magnetism.\nI have no idea on how to weaponize it.\nProbably you need great force.\n\nConsider rechecks. These are only my guessings.\n\n\nMy friend just told me that blood is dimagnetic.\nIt means that blood opposes charges from another substances.
265124
A magnet consists of molecular magnets.\nIf these magnets are arranged uniformly then the magnet will be stronger.\nIn an ordinary piece of iron there are molecular magnets, but since they are irregularly arranged there is no net magnetic field created.
193752
Well, maybe not one that can be found in stores, but I have made my own. I have awards and medals adorning my refrigerator. I have this fantastic thing called magnet paper. You can pretty much make a magnet out of anything. When I have done something particularly fantastic I make myself an award. Sometimes it's just a banana glued to a magnet, sometimes it's an inspirational poem, but it's always cool to get an award...even if it's from myself...
48111
Sounds like a couple of old 72-pin SIMMs...unless someone has a 5 year old (or older) PC they need to keep running, that memory isn't worth anything.  Personally, I glued magnetic strips to some of my old memory & use them to hold documents on my white-board at work.   :o)\n\nLooks like maybe you'd get a buck or 2 on eBay...  (see link)
21325
When talking about a magnet large enough to be handled (and broken), it can be thought of as a collection of smaller magnets.  These smaller magnets are all aligned from north to south poles on each end.  If you got two 1" x 1/2" magnets, and put them end to end, N to S, they would make a magnet double the length of the original, and the ends would attract.  If you take the now 2" magnet apart, you have two magnets.  In practice, this is exactly what happened when you broke the magnet.  The pieces are still magnetic, with a north and south pole.  Therefore if you take the 2 pieces and put north to north or south to south, they will repel, and vice versa if north to south, they will attract.  No one yet has found just a south pole, or just a north pole, and that causes a stir in the scientific community.  You can keep crushing the magnet to bits and the tiny fragments will still have a north and south pole, and act like tiny little bar magnets.
458753
You would need to have the magnet moving, and the power it would take to make it move would be more than any advantage you get out of it. Laws of Thermodynamics.
458576
Glad to see you're thinking, but this is an easily answered question.  \n\nTake for example a magnet.  Regardless of what is in front of your magnet it will still attract an object to a distance equal to its strength.\n\nex:\n\n.....(|)<<<< <[]<<<<<<<[]          \n\n......^..............^...... ......^\nMagnet......Metal..... ..Metal\n.................Object.... Object\n\nThe magnet is going to exert force on both of the objects without interference from first object.  \n\nBased on your definition of propagate...come to your own conclusion...that is the joy of thinking...we all have our own thoughts.
591199
http://en.wikipedia.org/wiki/Magnets\n\ngo there if u wanna find out, i only know simple version...
588781
when the magnetic needle (a magnet) is places close to any metal, the magnetic field generated by the magnet will cut the metal and causes some electron to move inside the metal, which causes to metal to have different electric charge at each end. now because there is electric charge, it causes an electromagnetic field (EMF). this newly generated EMF interacts with the magnetic field created by the magentic needle and causes it to reflect.\nI remeber doing a physics experiment that illustrates this same effect. we had two small synlindrical metals, one of them was metal the other just normal metal. we put each one of them seperatly from one end of a metal tube and let it fall through to the other end, the metal usually gets from the other side quickly because it is falling free fall in the tube, however, when we put the metal inside it, it took much much longer time for the metal to fall through, the reason, as the magnit is moving (falling down) inside the tube, it is generating a current in the tube which in tern creats a magnetic field which opposes the magnetic field created by the magnet therefor the magnetic field creats a force that tried to repel from the falling magnet and it creates a force that tries to push the magnet up in the tube, of course the gravity is stronger and eventually the magnet comes out from the other end, but it didn't fall a free fall therefor it came out late..\n\nI hope this helps.
240158
You want to put a high permeability material between the magnets.  Traditionally, mu-metal is used for this.\n\nWood would not work.
156598
Do you mean "magnetic"?????
395685
no they wont. although theoritically they should appear, they wont attract exactly from where we broke them. this is due to the fact that the magnetic poles donot reside at the extreme end, they reside some distance away from the ends. if you cut it exactly along its cross sectional area than they attract and will tend to join at the same place where we have cut it.
111462
Basic electricmagnet....wrap thin insulated wire around a nail....connect the ends of a wire to a battery.  Increase the size of the nail....increase the number of wraps of thin insulated wire.....and lastly increase the amount of battery and you will increase the strength of the magnet.
43844
you could sew flexible magnets into fabric. You may even be able to mount magnets into fabric like you would a button.  \n\nOK I GOTTA ASK... What are you making?
19370
well, the magnetic dipole moment of a loop is given by mu = I*A where I is the current and A is the area of the loop.  so, to maximize the area for a given perimeter, i think you want a circular loop.\n\nhttp://www.faculty.fairfield.edu/jmac/ther/superlatives.htm\n\nas for whether to make a single loop or lots of loops, consider how much area you get for a wire of length L.  the circumference of a circle is C = 2*pi*r, and the area is A = pi*r^2.  solve the first equation for r and plug it into the formula for area, and you get A = C^2/4pi.  here C is simply the length of wire you use.\n\nso, if you make N loops of length L, then you get a total effective area of N*A.  but, if you make a single loop of length N*L, then you get a total area of (N*L)^2/4pi = N^2 * A, which is a factor of N more area than the case with N loops.  \n\nit's because of the r-squared term in the area - as you increase the amount of wire, the area goes up like the square of the length of wire.  whereas if you just add extra loops, it only goes up linearly with the length of wire.\n\ncheers!