why isn't magnetic repulsion used as an energy source?
443067
it is used on high speed trains in Russia.  They are called bullet trains.  but i do agree we should have more energy sources from this technology.
758600
Your first paragraph is quite true. Tesla patented various methods for transmitting power using large resonators with local "receivers."  If you have a resonant cavity you can get pretty good coupling between source and receiver (microwave oven for example).  The general use for power distribution has its problems, not least of which is how do you charge($) the receiver?\n\nThe analogy of sympathetic vibration is valid.\n\nNot sure what to make of the magnetism bit.\n\nElectrons resonate - they may in fact be "resonances"\n\nOur entire electrical power system is based on Electricity and Magnetism so I think the answer is yes we can pick up energy.\n\nWhat may be missing is that we also have to provide the energy up front before we get to pick it up!
606031
It's O.K. to stipulate there's no resistance - but not that the system can reach a static equilibrium state with no energy dissipation at all. The two assumptions are incompatible.\n\nIn the absence of resistance, the inductance, which can never be exactly zero even for a straight wire, would limit the current and also cause its direction to oscillate back and forth between the two capacitors until exactly 1/2 the original energy is lost through EM radiation. \n\nIf somehow there were no radiation, the system would keep oscillating forever with 1/2 the original energy being held in the magnetic field at the moment in each cycle when the capacitors were each exactly half charged. The rest of the time the capacitors would hold between 50% and 100% of the original energy.
827956
The leading theories have to do with magnetic reconnection, but there are people still pushing the idea that nano- or micro-flares can heat the corona.  I've done research on the nanoflare idea, and I have to say - reconnection seems more plausible.
510921
No it does not. Takes more energy to twist them. If it was the same you would have a perpetual motion machine. No such thing. You are not creating energy you are only transforming it.
627841
GOOD IDEA.\n\nEven better - why not build more of the Japanese train (there's a small one in the UK too) which travels on the +/- polarity of magnets along with an accelerator.\nThere is no friction at all with these, and, apparently, no limit to a top speed !\n\nThere are no environmental issues either.\n\nBig question though, would the oil/gas companies allow it, seeing it would destroy their business ?
303378
Hi,\n\nYou know that if electricity is apllied to a coil over a magnet it causes mechanical movement due to the formation of magnetic fields similarly the converse is also true\nthat if mechanical energy is applied to a similar but reverse arrangement electricity can be produced\n\n\nwhen current flows magnetic fields are induced but if a fluctuating magnetic field forms in a ciol electricity is induced
994725
An electromagnet is an iron core with wire wrapped around it so that the magnetic field that forms at a right angle to the direction of current becomes intensified in a specific location.  The reason for using insulated wire in an electromagnetic device is that it is not the current (electron frequency) moving through the wire that the engineer is interested in, but the automatic magnetic field that forms outside the wire.  This field is able to be formed, collapsed and reversed whenever one wishes to do so.\n\nA gravitational field (as our planet for example) is always one directional and the direction of energy flow is toward the core point of our planet.  Below the Moho line mass has its gravitational waves all focused toward the core point.  This means that all gravitational waves below that line pass through the very center of our planet and attract all mass directly on the opposite side, and at the same time also attracts all the heat energy of our planet to the core point.  If this were not true, then our planet would have (nearly) the same temperature throughout.
686726
Actualy there ARE free energy solutions out there, such as a self sustaining magntic generator the problem is noone will fund building these power sources becuz there is no profit in free power and we all know everything is about money and profit.
268419
Methods\n\n\nDiamagnetism\n\nA substance which is diamagnetic repels a magnetic field. Earnshaw's theorem does not apply to diamagnets since they behave in the opposite manner of a typical magnet (relative permeability μr < 1). All materials have diamagnetic properties, but the effect is very weak, and usually overcome by the object's paramagnetic or ferromagnetic properties. A material which is predominantly diamagnetic will be repelled by a magnet, although typical objects only feel a very small force. This can be used to levitate light pieces of pyrolytic graphite or bismuth above a moderately strong permanent magnet. As water is predominantly diamagnetic, this property has been used to levitate water droplets and even live animals, such as a grasshopper and a frog. The magnetic fields required for this are very high, however; in the range of 16 teslas, and create significant problems if ferromagnetic materials are nearby.\n\n\n\n\nSuperconductivity\n\nDue to the Meissner effect, a superconductor also expels magnetic fields (μr = 0), much better than a diamagnet. Due to this (and flux pinning) the magnet is held at a fixed distance from the superconductor or vice versa. This is the principle in place behind EDS (electrodynamic suspension) magnetic levitation trains.\n\n\nFeedback control systems\n\nIf the position and trajectory of the object to be levitated can be measured, the field of nearby electromagnets (or even the position of permanent magnets) can be continuously adjusted via feedback control systems to keep the levitated object in the desired position.\n\nThis is the principle in place behind common tabletop levitation demonstrations, which use a beam of light to measure the position of an object. The electromagnet (arranged to pull the ferromagnetic object upwards) is turned off whenever the beam of light is broken by the object, and turned back on when it falls beyond the beam. This is a very simple example, and not very robust. Much more complicated and effective measurement, magnetic, and control systems are possible.\n\nThis is also the principle upon which EMS (electromagnetic suspension) magnetic levitation trains are based. The train wraps around the track, and is pulled upwards from below.\n\n\nOscillating fields\n\nA conductor can be levitated above an electromagnet with a high frequency alternating current flowing through it. This causes any regular conductor to behave like a diamagnet, due to the eddy currents generated in the conductor. Since the eddy currents create their own fields which oppose the magnetic field, the conductive object is repelled from the electromagnet.\n\nThis effect requires high frequencies and non-ferromagnetic conductive materials like aluminium or copper, as the ferromagnetic ones are attracted to the electromagnet.\n\n\nHalbach arrays\n\nAnother way of stabilizing the repulsive effect is to use fields that move in space, rather than just time. This effect can be demonstrated with a rotating conductive disc and a permanent magnet, which will repel each other.\n\nThis is the principle of the Inductrack maglev train system, which avoids the problems inherent in both the EMS and EDS systems. It uses only permanent magnets (in a Halbach array) and unpowered conductors to provide levitation. The only restriction is that the train must already be moving at a few kilometers per hour (about human walking speed) to levitate. The energy for suspension comes entirely from forward motion, efficiency is good, and no extremely low temperature suspension magnets are required.\n\nHalbach arrays are also well-suited to magnetic levitation of gyroscope, motor and generator spindles.\n\n\nGyroscopic motion\n\nThe reason a permanent magnet suspended above another magnet is unstable is because the levitated magnet will easily overturn and the force will become attractive. If the levitated magnet is rotated, the gyroscopic forces from spinning and precession can prevent the magnet fro
380796
simply no. it is not possible to have a perpetual motion machine because there will always be some energy lost. fusion is fantastically efficient in terms of mass to energy and has none of the radioactive problems of its fission counterpart. however it still uses up fuel and you cannot then reuse this. also the technology at the moment uses more energy than it produces meaning that this is still quite a long way off. this is perhaps the most realistic way of powering the spacecraft that you appear to visualise however there is still the problem that it cannot go fast enough and unless a way is found of bending space itself you cannot go faster than the speed of light or indeed reach the speed of light so the answer is no at the moment and no for the foreseeable future.
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.
1185123
The only motionless electromagnetic generator I know of is a solar panel.  While you can generate energy with coils you need a strong changing magnetic field.   The only way I know how to make one  without a preexisting current is spinning some kind of a magnet by wind, water or steam.\n\nNo something does not have to work to get a patent.  It is not the patent offices job to make sure something works.\nA patent is only good if you can successfully sue someone for infringing on it.\nI can patent an teleportation device right now if I want too but unless builds one almost exactly like the one I describe I am just wasting my time and money.
530744
An alternative energy source
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.
230115
Magnetic energy is the energy associated with a magnetic field. Energy can be stored (like energy stored in a stretched rubber band.) The energy stored in a magnetic field is called magnetic energy. It is produced by the flow of an electric current through an inductor (like a coiled wire). It can be used to do work.
1177493
I don't see how they can charge Potential Energy to get in.  If it's trying to get in, it's KE duh.