What are the differences between an electromagnet and a regular magnet?
146783
regular magnet is a permanent one and electromagnet is an artificially created magnet which behaves as a magnet when current is passed through a wire around a iron bar\nelectromagnets are widely used
418317
http://en.wikipedia.org/wiki/Magnetism
1092759
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.
172938
Electrostatics is the study of static or non time varying electric fields.\n\nElectromagnetics is the more general term applied to the study of electric and magnetic force fields.  Usually most situations deal with time varying currents producing time varying magnetic fields.  Maxwell's equations show us that time varying magnetic fields produce time varying electric fields.\n\nThe rest of electromagnetics is the study of the physical properties of these force fields, how they behave in a conductor, how antennas can radiate these fields, etc.
280023
Short answer: The electromagnet is not doing work; if the motor is not stalled, it is doing work.\nSaturation occurs at some field intensity per unit core area. The bigger the core the more energy in the saturation field. Field energy is a function of current times number of turns in the coil. So in an electromagnet with a large core, more ampere-turns are used to make a higher-energy field. Theoretically it should take no electric power to maintain an electromagnetic field, because no mechanical work is being done. In fact superconducting electromagnets use exactly zero power. \nTo be using 90 watts, a small motor must be either doing mechanical work or stalled. The small armature core can sustain only a much less energetic field than the electromagnet. A magnetic field does work when it moves something against an opposing force. This energy loss reduces the field energy, and it takes electrical energy to restore the field.\nWhen the motor is stalled by too high a load, things work differently. No work is done and the winding may draw a lot of current and overheat. This is because the armature is designed for efficiency at speed but not stalled. It has a low-inductance winding (one with fewer turns and higher current) which can reverse polarity more easily, and two reversals are needed each revolution. Under no load, the armature runs at high speed and generates a "back-EMF" that results in almost no current drawn.
1041895
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.
104827
An electromagnet , it is temporary magnet.without the electrocity, it is not a magnet.
1076485
i dont know much about physics but i did a search and this is what i got hope it has what you're looking for:\n\nhttp://science.electronicsinfoline.com/Physics/Electricity_and_Magnetism/
644673
They get cold. \n\nThere are some effects on magnetic properties when you go very cold (search on magnetism AND temperature) especailly for electromagnets. Some things which aren't magnetic start to become so and things which are magnetic become more so. You wouldn`t notice much if you used a home freezer, you need to get much closer to absolute zero.    \n\nMaking it hot has a more important effect. A permanent magnet heated to above its Curie temperature will lose its properties.
118123
There is a force applied to the permanent magnets equal to the force applied by the armature, but since the permanent magnets are usually attached to something huge they don't move much.  So there is little work done on them and so they don't eat up power.\n\nIt's just like asking "if I stand facing a wall and use my arms to push away from it, where did the power go in the wall".  It barely moves, so it absorbs very little power.\n\nSome power does go into the permanent magnet, due to the effects mentioned in the answer above, but it is generally small.
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.
78592
Magnetism is simply the movement of charge.  If you take a coiled wire, and put an electrical current through it, you will in effect get a magnet.
361293
Do you mean "magnetic"?????
683402
It depends on the size of the magnet and its strength.  Putting an average strength magnet the size of a quarter next to a hard drive kills it.  However, in your laptop the hard drive has additional plastic shielding, but be warned, any magnet over the size of s nickel with one inch of your hard drive will fry it.  Remember that magnets go through plastic, cloth and other metals.
1025824
There are a couple of naturally occurring ferromagnetic substances, like magnetite (Fe3O4) or nickel-iron from comets, which can act as permanent magnets. The metals iron, nickel and cobalt all exhibit ferromagnetism and can be magnetized. Oxide minerals from these elements may be ferromagnetic, too.
128833
Three types of magnets:\n\n-Ferromagnets: Magnets which retain a magnetic field after having been magnetised in a magnetic field.\n\n-Paramagnets: Magnets that only exert a magnetic field when they're in another magnetic field.  They support the magnetic field they're in.  Usually their fields are quite weak compared to the external fields.\n\n-Dimagnets: Magnets that exert a magnetic field when they're in another magnetic field but opposing the field.  (Think: *DI*ametrically opposite).  Again, field intensity created by these magnets typically is very small compared to the external field.\n\nAdditionally, many dimagnetic and paramagnetic materials may become ferromagnetic if they are sufficiently cooled.\n\nPermanent magnets are most often ferromagnetic and will retain their magnetism for a long time even in the absense of a magnetic field.  Over time, however, thermal effects will slowly decrease field intensity, but that takes a long time for permanent magnets.
841413
Under normal conditions, magnets only affect the ferromagnetic elements (iron, cobalt, and nickel). So unless you have an abnormal amount of metallic iron in your body and the magnet is REALLY strong (think MRI strong) you should be fine.\n\nUnder abnormal conditions, liquid oxygen is magnetic, but it's a different kind of magnetism.