maybe lead or something else were magnetic fields cannot penetrate
127156
No there is no substance which can block magnetism except another magnet.  You can block electromagnetic energy quite easily depending on the strength.
60314
Umm,.. hmm.  You should probably google this, keyword: superconductors.  Its not really a new discovery.
619672
I had the same problem when I learned about both of them. \nBut now think of it in a different way. You are assuming that the magnetic FORCE that magnets have on certain metals. But if you think about it carefully they don't create or destroy energy. \nIf you don't beleive me consider a piece of iron with only gravity working on. But its height is 0 so it has no Potential or Kinetic energy. But now let's say you bring in a magnet. Now naturally that will make the iron bar rise and stick to the magnet. Now a natural assumption would be that you just created potential energy because the height of the iron bar just increased. But now you have to consider the fact that magnet is still putting some force on the Iron bar. So no change in potential energy occured. No change in Kinetic energy occured once the bar stuck to it. and the Energy needed to bring the bar up could be accounted by the energy needed to bring iron bar in. This shows that there was no energy created.  \nI think that you are trying to overthink the problem. I think this should help good luck.
20101
yes all matter can be magnetized or we would not have MRI in hospitals. the element at the part of the periodic table where iron is magnetizes and keep that magnetic properties easier than other elements.
643419
You have the potential for galvanic corrosion.  Essentially, two metals at different potentials share electrons and one metal (the one with the higher potential) will start to erode and "plate" the other metal.\n\nTypically, using some sort of material that is a non-conductor (ceramics, rubber, etc) between the two or passivating the metal surfaces or coating the metal surfaces (prime and paint per ANSI standards) are your best options to prevent this.
158746
Theoretically possible. You are making the "atom" analogy -- positive charge in the nucleus and electrons around it. Your magnetic analog would be hard to detect since it appears "non-magnetic" outside the "sphere".
246831
prooly need ifrared thingy\ntry a industrial magnet
87771
In theory it is possible but in practical application it is difficult because supper conductivity can be acchived only at very low temperature & it will not be economical to do so.
566407
Maybe it has something to do with grounding. If a ship is in the ocean and not touch anything then there is no reason for the current to go up right?
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.
496010
Using a metal detector on saturated ground can yield different results. Wet ground allows for the magnetic field produced by the metal detector to penetrate deeper. This may allow you to find deeper items that wouldn't be able to be found if the condition of the ground was dry.\n\nMetallic items will corrode while in a wet environment. This may cause items to appear larger than they really are while detecting.  Silver may corrode a little, while gold will not corrode at all. Metals that will corrode the most are iron and steel. Corroded metals can cause for a large amount of false signals. Metal Detectors that feature Ground Effect Rejection can help eliminate these annoying false signals.\n\nWhile you may think metal detecting in wet conditions may be not worth the time, more treasures that are deeper in the Earth can possibly be found\n\nThe reverse can be said for dry ground (Summer).
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.
521417
On a lighter note...I would love to be able to answer your question, but this computer keeps hanging!!!\n\nSorry, but I couldn't resist that one! On a more serious note, there is no doubt in my mind that very little is truly understood about the electrical and / or magnetic effects of some people. I must confess that I do not suffer from such experiences, however I do know people who do.\n\nFinally, just imagine all the people who are trying to reply to you but they can't get close enough to a computer!
240001
YES IT IS TRUE THAT THE MOUNTAINS YOU HAVE MENTIONED ABOVE HAVE A GREAT MAGNETIC POWER. THIS HAS A SIMPLE REASON.\nA MOUNTAIN CONTAINS LOTS OF METALS AND NATURAL MAGNETS.\nTHE MAGNETIC AREA CAN BE SEEN WITH A CAMERA WHICH SEES MAGNETIC FIELDS.
668913
Magnetic field has to do with the polarize charge of material, such as Iron.  \n\nIt is believed there is significant Iron near the center of the earth and yes rotation will cause the charges to align and thus create a magnetic field.  This is called the "Dynamo Theory".\n\nJUST BEING IRON DOES NOT MAKE THINGS MAGNETIC.\n\n"Previous theorists have assumed that the entire Core (or the Inner and/or Outer Core) rotates as a single flowing object within the Earth. If that were the case, then all of the charged (ionized) Iron material  would follow a relatively circular path around a single axis that we could call the Magnetic Axis. Basic Physics tells us that when electrical charges follow a closed (relatively) circular path (which is effectively a current), a magnetic field is always created as a result. The measurable evidence of this scenario would be a simple "dipole" magnetic field, with a single North Pole and a single South Pole, geographically exactly opposite each other on the surface of the Earth."\n\nSo if this theory where correct the Earth stopping it's rotation would in allow the magnetic field to fad.  But there are major problems with the theory.  For example it is known that the magnetic poles have flipped (Switched places) several time in Earths past.  Will if we have magnetic poles because of the earth's rotation to switch poles we'd need to reverse the cores rotation.  This would be an ungodly amount of energy.  There is nothing known that would do this once let alone a number of times.  And even if something could do it, we should have seen signs of the massive damage that would have resulted with these forces in play, like the Earth falling apart.   But in fact the poles shifting seems to be a pretty peaceful process on a planetary scale. \n\nAnd that is only one problem with the theory.  This is actually a very, very complex subject and there really is no way to know what effect the Earth stopping would have on the magnetic fields.  But I have attached a link to a very good article on the subject and it's pretty easy reading (Keeps the scientific jargon down and uses layman terms.)\n\nOthers are correct tough in what holds us to the Earth is gravity, not magnetics.  So it's the Mass (How big and dense it is) that keeps us here.  And rotation actually wants to make thing's fly away from it.  So we stay because the Earths gravity overcomes the acceleration.  So the acceleration of 1000mph is actually always enacting upon us, making us want to fly off the planet.  So stopping the Earth will not make us fly off as others have posted.\n\nThink of the spinning rids at the fairs and theme parks.  When you spin you are thrown away from the axis, the best example is the cylinder you go in and stand up against the wall.  When it spins your back is pushed against the wall, even as it turns so you are now spinning vertically like a tired, instead of horizontal like a top.  But when they stop the ride you don't go flying out.  That's because the wall holds you in and your move with the ride.  Well gravity acts like the wall and you move with the earth.\n\nYou would go flying of the earth if it continued to rotate and the gravity field somehow disappeared.
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.
184278
bring the magnets close to each other. If u feel any repulsion, that means u have tried joining opposite poles.\nWith this test u just come to know of the repulsive and attractive sides relative to a magnet. No qualitative nalysis of which is North pole and which is south cannot be done! But hey! If the bar magnet is painted red on one side, then that would be the north pole!