Could you use magnetic repulsion to duplicate the force created by the combustion of gas in an engine cylinder
437326
Yes, just by using an electric motor which is based on both attraction and repulsion.  You would still need a good source of energy though to replace the energy that is provided by the combustion of the fuel.
4899
You are already stressing the components of the motor by almost doubling the cubic centimeters and in my opinion adding the extra horsepower of nitrous to a motor that wasn't ment for it would cause blown head gaskets, overheating and piston melt down. Those motors are touchy enough without the nitrous!
294062
In theory it could work but the process would create a large amount of heat and therefor the engine would be so heavy that it would not be practical. Maybe in a stationary application?
14076
MHD engines do exist, but they're not efficient enough yet to put into practice.\nAlso, remember that they're basically a linear electric motors but with no moving parts so they have to be powered - by diesel-electric, or nuclear, or whatever.
25959
you could... whith a very very strong field you can magnetize almost everything... but you wont afford enough money and space to do this at home :-)\n\nTry for ferrofluids, these are liquids(like oil, maybe water?) containing magnetic nanoparticles... you could afford that.
907372
A magnet whose magnetic properties is dependent on current flow.
985642
You try what the first poster suggests, but it isn't likely to work well. Besides the danger mentioned of doing damage to the equipment, you will have one of these problems that will prevent the result you want:\n1) the electromagnet won't be strong enough to have any demagnetizing effect at all, \nor,\n2) the electromagnet will completely demagnetize the permanent magnet.\n\nUsually magnetic catches consist of a flat steel plate that seats against two poles of the magnet. A better solution is to put a few layers of tape on the steel plate so that it does not come into contact with the pole pieces. Depending on the kinds of tape you have around, one layer might be enough.\nMagnetic force falls off very rapidly as you separate the surfaces.
76877
You might be able to make a PM machine based on a vaporizing and recondensing fluid, which is what I'm guessing you're getting at. PM, that is, as long as the necessary temperature differences continue to exist. You would need to vaporize at a low point and condense at a high point, with wheel motion bringing the heavier containers of condensed fluid down to a warmer location for vaporization. It doesn't violate any thermodynamic laws since it takes heat input and exhausts cooler output, just like the water-bobbing woodpecker does. Do it!
751378
Hey Bob,\n\nApparently, Yes, it can be done.  it can be a lot easier than you might think as well.  If you hold a flow of hydrogen to the carburettor, the hydrogen will be drawn into the chambers and combust, powering the engine.  There are a couple of major problems with this though.  First, you need a source of hydrogen, which means driving around in an H bomb effectively.  If you were to use water, and make hydrogen that way, the vehicle would have to be very very big to produce enough hydrogen to allow the combustion to work, so even though it can be done in theory, it's not safe or is not feasible just yet.\nAs soon as someone works out how to get the hydrogen from water more efficiently, they will probably be the new Einstein (or shot by oil tyrants)
154800
From what I know about permanent magnets, the heat is the killer when you get near the transistion temperature of the material.  When you do this, the magnetic domains become randomly aligned again and the pole force gets reduced.  If you keep heating it, you can totally demagnatize the material.  In fact, during the manufacturing process, the material is heated very hot under a very strong magnetic field and cooled, allowing the aligned domains to be "frozen" making a high force pole.  \n\nSo in motor design, the aerodynamics of the rotor, the eddy currents generated while running, and the torque loads, will all contribute to heating the magnets.  If you can master the thermal design, you can make very powerful motors.
452881
False, because the binding energy increases steeply till iron and again reduces. So I would require enormous accelerators to transmute the element with Z>20.
323464
Someone has used a gasifier and captive-piston engine to make a one-moving part alternating-current generator. The piston is magnetized and the coils are in the body of the cylinder. The trapped air in the cylinder at each end of the piston acts as an air shock to eliminate rebound and impact damage. No sensors needed. No make and break circuit. The voltage drops to zero at the end-points of travel of the piston. Search on this and you can probably find the same one I saw. I think this is where they got the idea for those new shake-up LED flashlights.
360899
Yes, this is the principle that motors work off of.  It is also used for other purposes, such as launching roller coasters.  While it is possible to control the strength of the magnetic field in an electromagnet, permenant magnets cannot have their fields controlled.  So, in order to control the force between two magnets, only one of them must be controlled, so one may be an electromagnet and the other a permenant magnet.
191596
Sounds like you're talking about a magnetic levitation train or maglev for short. This is not an easy project and you will likely have to fabricate the magnetic track and induction coils (still do some searching, but I don't know of anyone that carries model sized maglev material). I have included a couple of links for you to get started with. Good luck!
1074720
none of the answers is correct , actually magnetic lines of force will be acting in anticlockwise direction.
268504
I'm not sure anyone really "know" but there are many teltail clues.  Not all materials are magnetic except perhaps under very powerful magnetic fluxes (MRI's?) but all atoms of materials do have one or more electrons orbiting their nuclii.  We know that electrons can be directed by magnetic flux, perhaps in a TV picture tube, etc.  Therefore, the number and arrangements of electrons of the atoms differ and some create magnetic properties (dipoles or two different poles).  If an iron bar is heated to a high temperature all the iron atoms in the bar are permitted to spin around willy-nilly.  If the bar is then cooled while exposed to a strong magnetic flux (electromagnet?) all its dipoles will align uniformly with the external flux like the needles of compasses aligned with the earth's flux.  When cool, the magnet exhibits the combined strength of all the dipoles that were previously working against each other.  We know that atoms repel each other because of their electrons (and even their nuclii must be forced together to fuse because of protons) like basketballs with ballbearings at their centers, where the skins are made of rapidly orbitting electrons.  Whereas the basketballs would repel each other in any given positions, actual atoms in iron crystals repel directionally and they which can attract or repel a free electron.  The magnet has collectively directed their combined force.  If each dipole has a North and South pole, we would expect the entire magnet to also have a North and South pole, and for like poles to repel, just as in the individual dipoles.  Hope that helps a little.
105221
Well, the easiest way is to get some wire, wrap it around a iron/steel rod, and apply a current to the wire.\n\nTo get an electromagnet to have a lifting capacity that you specified, it will require a little more engineering work.  Trying to stay in the most basic terms, the power of your magnet will depend on how much current you put through the wire, how many turns you have around the iron rod, and something called the magnetic permeability of the iron rod.  Now there's some trade-offs with all of these factors.  More turns increases the magnet flux (strength), but requires more wire and increases the resistance.  More resistance means that you will need more current to counteract this problem.  Treating your electromagnet strictly as a resistor (which it is not), by following Ohm's law, you increase the current by increasing the voltage.   Too much current and you may end up melting your wire.   You want to keep the wire as small as possible so that you can get the turns as close as possible to your iron rod, but smaller wire has a higher resistance and lower current carrying capability.\n\nIt's a matter of balancing a lot of equations to get the best combination.  Your best bet is a little trial and error.