Can the resistance of two magnets be controled?
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.
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.
509341
never ever if they're a product of a single magnet! if they do, there will be a resultant magnetic field at that point which is quite probable(from more than one magnet)
856860
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.
641079
I believe that to reverse the polarity of and electromagnet you need to reverse the eletric current becarse the move ment of eletrons makes magnets
179742
Various springs (flat or helical) deflect linearly with load and resistance of certain wires (nichrome, etc.) varies linearly with length.  If your experiment allows or expects large deflections you may be able to combine the spring/resistors into a circuit that calibrates force/deflection/resistance-reading suitable for measurement on an ohmmeter or perhaps a strip chart recorder.  Good luck.
198626
You could measure the strength of an electromagnet by hanging small iron \nweights from the magnet.  When the applied weight (force of gravity acting \non the weights) exceeds the force of the magnet, the weights will fall \noff.  Steel Flat washers of the same diameter as the coil would be \ninexpensive and simple to use.  You can weigh several washers on a food \nscale and calculate the average weight of each washer.\n\nThe equation for the magnetic field strength, H0, in Ampere-turns per \nmeter for an empty (air) coil is:\nH0 = the applied voltage / (the number of turns of wire in the coil \nwinding X Area within the coil winding X the permeability of air).\nThe area is pie X D squared/4, where D is the diameter of the coil winding \nin meters.\nThe permeability of air,  , is 4 X pie X 10 to the - 7  henry/meter\n\nThe Equation is for a direct current.  An alternating current applied to \nthe coil cannot be used for lifting magnetic objects.  \n\nBy substituting different numbers for the applied voltage, the number of \nturns of wire and the diameter of the coil, you can calculate how each \nparameter will effect the strength of the magnet.\n\nElectromagnets can be fun, however,  keep them away from recorded tapes or \nthey will erase the contents.
45988
You can most certainly pass a current.  Back when I was in E&M lab, we would get a chain of people all holding hands, divided in to chains.  The guy on the end of one chain would grab the anode of the power source, and the other chain had someone grabbing the cathode.  Then the two people on the end would simultaneously grab the one dude who refused to participate, which closed the circuit and gave averyone a quick jolt.\n\nGood times.  But no, it doesn't have anything to do with iron.  It's mostly because of the sodium cations and the chloride anions in your body conducting electricity.
561277
MAGNET THATS POWERED BY ELECTRICITY
312735
Try a damping circuit.
249398
I suppose you are reffering to the small digital scales. They have a device whos electrical resistance changes under pressure.
484193
You mean 2 P of a M which is 2 poles of a magnet.
926622
The CT will only work on an AC circuit so I don't see where it would make any difference.  The only thing that would is to have another phase too close and the magnetic fields might cancel each other. Since the current being measured is AC the output from the CT will also be AC and shouldn't matter on the leads.
152782
If a bar magnet breaks into two, then there will be two magnets, each with a N and a S pole.
764447
It depends on how powerful a magnet you use. To get a magnet to perform all of those tasks, it will need to be a really powerful one.
426889
Antigravity, but that hasn't been proven.  Magnetism works when you have two magneticaly charged objects.
140684
I guess it can be magnetized. I don't think there would be any problem even if its in the form of a moebus strip, or any form at all. Anyway I am curious for other answers.