magnet gravity

Couldn't, with well position magnets, create an orbit around a central magnet? Almost like perpetual motion? I've been playing around with magnets lately, and I've gotten magnets to do 2 full revolutions around other magnets before coliding. Is it possible?

Topic by guyfrom7up   |  last reply


Electro Magnets

If an electro magnet is suspending something in an vacuum environment, will it act as a medium? (Will sound waves be able to pass through the magnetic field?) Thanks

Topic by Weissensteinburg   |  last reply


magnet motor or not ?

Is an angle grinder motor a permanent magnet motor or not ?,

Question by nicobotha12345   |  last reply


Magnets and Microwaves

I'm planning on setting up a kind of utility rack in the kitchen, and the top of the microwave is the most convenient location. I was planning on using neo magnets to hold it all in place, but does anyone have any idea if they'll affect the magnetron?

Topic by yontally   |  last reply


Neodymium Magnets? Answered

I have a motor out of an waxer/buffer and I was wondering what improvements neodymium magnets would be.  I have a couple plans for this motor, the first being for a temporary ball mill, and the second for a generator.  I am pretty sure the neodymium would be good for a generator, but what about a motor.  I am also wondering what magnets to get.  Should the north pole be the outside, south pole be the outside, should it be magnetized thru circumference, magnetized through thickness, or south on one side and north on the other.

Question by jj.inc   |  last reply


Magnetic spec

I was wondering how big a cylinderical grade N42 NIB magnet i would need to pull a copper weight of 20 grams from 3inches? I dont know how to calculate so... If you could, that'd be great

Topic by lifelong-newbie   |  last reply


Focusing Magnetism? Answered

Hi y'all! I am wondering if it is possible to focus magnetism? Like if you have a powerful electromagnet with a less powerful electromagnet wrapped around it. Then if both are turned on, the small one will focus the larger one creating a straight electromagnetic field and making like a "electromagnetic laser".  Thanks, joespicnictables

Question by joespicnictables   |  last reply



Is it possible to make a magnetic field strong enough to prevent a gun from firing?

Is it possible to make a magnetic field strong enough to prevent a gun from firing, stoppng the moving parts from moving? If so is it possible to make it directional?

Question by Kyndig   |  last reply


how to make an electromagnet thats a circle be positive on one side and negative on the other?

Im basically trying to make an electromagnet that will wrap around a tube of metal and i want to have it magnetize the inside of the metal tube and on the left (as your looking at the tube from the side) its has positive attraction and on the right it has negative push that is my question and if anyone could tell me how i could do this that would be EXTREMELY appreciated... not only that but if i could reverse the polarity so left is negative push and right is positive attraction that would be great to please help its for a science experiment and would be GREATLY appreciated 

Question by ShinigamiTentetsutou   |  last reply



Electromagnetism question Answered

Hi I just saw something weird, it's not an exercise or a problem but I still have a question :  Let's say we have 2 electromagnets of unequal strengths X and X+Y; between them we have a ferromagnetic bar  Let's say one has south polarity and the other one north if we change which one is stronger ex 1st is X,  2nd is X+Y than a moment after 1st is X+Y and  2nd is X the bar will have the polarity of the stronger one for a moment, right? ex for a moment the electromagnet with the south pole is stronger X + Y = the bar will become south pole than we return it to its normal strength X and make the north pole electromagnet stronger X+ Y= the bar will become north pole, right? How will such variations of the strength of the magnetic field on 1 side affect the entire device, will only the bar change its polarity and it will stop somewhere on the border of the second magnet or will the second electromagnet change it's polarity too if the first one's is very strong? (just wondering) If we fix a coil on the ferromagnetic bar will such variations in the magnetic polarities of the bar induce current in it and how much, as much as we used to produce the fields of both electromagnets or only for the field of the stronger one, or only the difference between 2? and the last question in the terms of relation between the strengths of both electromagnets (let's say in %) how much Y should be to change the polarity of the bar without affecting the polarity of the second electromagnet?  Thank you all in advance for your interest, assistance and time :)

Question by Elys   |  last reply


A way to calculate something about a ferromagnetic ball in a magnetic field? Answered

I've built something like this https://www.instructables.com/id/Mechanical-Rail-Accelerator---Non-electromagnet-%22r/ and now I am thinking of calculating the kinetic energy of a ball flying off the magnet if it was 'set off' by a ball at some velocity. I have a great lot of problems: 1 The ball is about the same size as the magnet, which makes it impossible to say it is 'infinitely small'. 2 It is near the pole, so the magnetic field is not even (not like inside a coil). 3 The ball is ferromagnetic, so the field is going to be even more disrupted. 4 There is no Physics teacher this week. Maybe (I hope) there is a formula of potential energy of something like my ball in a magnetic field? Any ideas? 

Question by gruffalo child   |  last reply


Does anyone have a digital copy of Faraday's "Experimental Researches in Electricity: Vol. 3"?

I am by no means an expert of copyright law, but Google doesn't seem to have a digital copy of volume 3. It has volumes 1 and 2. I know the copyright has expired.

Question by Vorenus   |  last reply


what is the specification of a magnet?

What should I ask in a shop to buy a magnet(not electromagnet )?

Question by piku2323   |  last reply


Feel a magnetic force?

I was just wondering is it possible to fell a magnetic force on your skin and if so how?

Question by Dominator57   |  last reply


Will a magnet work in space? Answered

Will a magnet work in space, if so, will its strength be affected making it seem stronger or weaker?

Question by Kaptain Kool   |  last reply


Questions about Magnets

Can an electro magnet have more gauss than a neodymium of the same size?  I was just thinking about robots and advanced prosthetics. One issue with them is they require rather bulky motors to get the lifting and holding capacity we often require. So if power wasn't an issue and you could make a small elecro magnet that has more gauss/a stronger magnetic field than a neodymium magnet. Than we could make strong and smaller motors.  Just a thought. Discuss!

Topic by mpilchfamily   |  last reply


Convert magnetic to electrical? Answered

I am trying to find a practical way to build a device to convert magnetic energy into electrical energy, some kind of generator or other device, there are several ways in which this might work in theory but actually building the device would be more difficult to figure out.

Question by thedriftcore   |  last reply


Linear Magnetic Field

I am stuck in my research,please tell me a way to make a linear electromagnetic field,other than making an outer core for it please help me

Topic by ajose4   |  last reply


HMC5883L with external magnet

GY-273 HMC5883L Compass A. I'm waiting for my chip to arrive and will attach it to a RasPi. B.  My question is: if I align my chip to "N" then rotate a magnet round the chip - i.e. a weathervane - thoughts on how that might work? C. Can my magnet, if too strong/close, damage my chip? Thanks

Topic by liderbug   |  last reply


Magnetic field redirection? Answered

Hi, I've never seen a community so welcoming and intuitive than the instructables community, so I decided this website is the best place to ask my question. I'm sure there is someone hidden deep within the fathoms of instructables that is versed in the matter of magnetic field redirection. I'm working on a project that I will post an 'ible of, (truly wireless speakers ;)) but I need some method of redirecting a magnetic field so it doesn't interfere with the speakers. I have heard of some methods, i.e. Mu metals, MagnetShield, but these are not easy to come by, especially in the UK. I have considered ordering from the manufacturer, but I am not willing to pay the exorbitant shipping costs. I would firstly like to know if such a material exists, or if alternative/better/cheaper methods are available, secondly, whether or not it can be procured in the UK, and if so, where, and thirdly, proper application of such a material. I have done lots of research into the matter, but have been left fruitless. I'm sure someone can help.                                                                 Merry Christmas,                                                                                             icyseptember

Question by icyseptember   |  last reply


Magnetic switch to USB?

Hi, 1st post hope you can help! I'm trying to find a way of getting analog data (from an exercise bike) and store it onto a computer in a text file so I can manipulate it and work out averages etc. I thought of having a magnetic switch on the pedal so that everytime the pedal rotates I can store the time thus giving me the speed. Does anyone know if such a cable already exists or if not how to go about creating one? Also if anyone has a better way of getting the data I'd love to hear from you. Many thanks Adam

Topic by adamt_069   |  last reply


Magnetic Levitation Tram? Answered

Hello there instuctables, I need your help with a project i am attempting, i am in the process of making a maglev tram and i have a couple questions i need help with? 1. I have a simple circuit for a linear motor that i understand to the most part but i need help with finding an electromagnet to use / make, it needs to run on batteries and obviously the main concern here is weight and stability so the smaller the better but still needs to be strong enough to propel the tram along the track so i suppose my real question is what ammount of winding, resistance and core material would be suitable for whatever voltage i could provide! 2. Next i suppose what way round should i place the magnets, should i place many electromagnets on the rail with sensorsand permanent magnets on the tram, or should i have a powered electromagnet on the tram and permanent magnets on the track? 3. Also what hall sensor should i use to detect the magnetic fields, unipolar switches or ratiometric sensors? 4. And finally control, how would i control the motion of the tram i.e. speed and direction? Id like to thank you all in advance for any help you could provide and i hope my description is accurate enough!! many regards, Scott Photo of simple linear motor circuit (img.1) When the hall sensor (switch) senses a pole of a magnet, it activates the transistor, in turn magnetising the relay and causing the current in the electromagnet (motor) to run one direction, then as the opposite pole is detected the relay de-magnetises and reverses the current thus reversing the pole on the electromagnet! This is designed so that with permanent magnets on the track in an alternating fashion of poles (nsnsns) the tram is either pushed or pulled along the track! 

Question by Xmortx114145   |  last reply


Electromagnetic and Magnetic Levitation

Hi! I am setting up a levitation system and need to estimate the amount of voltage and current that is needed for a 2" dia. coil to produce 4800 Gauss. I don't have any restrictions/requirements on the core, number of turns, etc as long as it would produce 4800 Gauss with a 2" diameter. How can this be calculated? (I have spent a lot of time googling for such information, but I am pretty confused and didn't find how to calculate this) Thanks!

Topic by J50Nunlimited   |  last reply


Magnetic accelerator coil Answered

Im going to try to keep this short. So a friend and I are both sophomores at our highschool and we are both in chemistry (which is a higher level science) and i built a coilgun for last years project and attempted to build a PWM driven one this year. My friend and I want to build a rather large coilgun using either 10 microwave oven caps or close to 40 or 50 caps from computer power supplies. What i need help on is whether we should use the microwave caps which are high voltage but low capacitance or the power supply caps which are 200 volts and around 500 micro farads. I also need help on what wire to use for my coil and how many turns for the coil. i would like help with a coil for each cap size. We are planning on using either a 3millimeter by 5 centimeter long steel rod or a quarter inch bolt. our goal is to at least shoot it through the wall of the physics classroom and maybe through the door of a car. anything helps. Thank you

Question by budhaztm   |  last reply


Is it possible to make the magnets lose it magnetic field permanently? Answered

I know magnets can lose its magnetic properties if exposed to heat, but is there a way to make the magnets permanently lose its magnetic fields?

Question by Plasmana   |  last reply


magnetic field from a permanant magnet can it be blocked?

Original Question (Hi does anyone know of a material that will block the magnet field from a permenant magnet without the material being to thick.) Thanks for your replies, to go into more detail, the material must not be attracted to the magnet as would mild steel The magnet force/pull is about 1LB and I need a material less than 5mm thick that will reduce its pull by at least 10 percent but the higher the better. Also it must not cost a fortune, (How much does Mumetal cost and is it attracted to a magnetic force),  I have searched high and low and I am now begining to think that  my search is futile and maybe no such material has yet been discovered. Your my last hope people. Thank you.

Question by needtoknowmore   |  last reply


Will a magnet mess up or destroy the memory of a micro controller or EEPROM chip? Answered

I'm using an ATMega 328 chip (Arduino duemilanove), if that matters at all. Ask me if you need the chip name for the EEPROM. Also, if you happen to know, would a magnet mess up flash memory?

Question by kroq-gar78   |  last reply


Is it possible to transfer data via magnetic induction between two coils separated by a steel plate ?

Is it possible to transfer data via magnetic induction between two coils separated by a thin steel plate of 2mm ? Or does the magnetic field gets diminished by the metal plate?

Topic by ZZamorin   |  last reply


How is it that I can measure voltage across an unplugged wall wart? Answered

I have a 9V wall wart that's been unplugged for 2 days.  I hooked it up to my volt meter with intentions of checking the polarity as I plug it in.  Without plugging in the wall wart I attached the meter leads to the exposed wire of the wall wart.  It immediately showed a voltage of -10 point something.  I was glad to find the wires were backwards which explains my fried regulator; however how is it that I was able to pick up a voltage, even after discharging it the voltage slowly rose again, unplugged!  Does this have anything to do with earths magnetic effects on the inductor?

Question by Dude Man   |  last reply


Magnetic Levetation? A Magnet Levitating between two Bismuth plates?

I am trying to make a magnet levitate between two bismuth plates that i made (picture 3,4,5 and 6). As you can see they are round discs about 7mm (millimeters) thick and 110 mm or 11cm (centimeters) in diameter. I bought two magnets; -the one I am trying to make levitate is 30mm (millimeters) in diameter, 10mm thick, and 22kg (kilograms) strong... -the other that is on top, the one that is pulling the magnet up is 30mm in diameter, 15mm thick and 23kg strong I put my two plates of bismuth so that there is about 25mm of space between them... Than I put in the 30mm x 10mm magnet that I want to levitate inside. The other magnet is located above the setup. I very slowly, ever so carefully start to lower the magnet. The magnet between the two bismuth plates starts to shake and at one point hits the top bismuth plate. I can't make it to levitate, either it is on the bottom plate or on the top. I tried to make the space between two bismuth plates smaller and larger, to lower the magnet by a very small amount...it didn't help... PROBLEM: I can't make it levitate, either it is on the bottom bismuth plate or on the top... WHY IS THIS? HOW CAN I FIX IT AND MAKE IT LEVITATE? Thank you for your help! -Stanislav A.K.A. Comodore

Question by comodore   |  last reply


Waveform of pulsed magnetic fields... Answered

I have recently been astoundingly interested in magnetic fields, for seemingly no reason. The point is, that in reading up on it, and being a big fan of the greatest mind of all time, Nikola Tesla, I have been stumped with a question that I can't quite seem to answer, and can barely wrap my head around. My question is this; when one takes a normal electromagnet and sends pulses through it, is the resulting pulsing field considered to be longitudinal or transverse waves, or something else all together? This has baffled me, and I am curious to see the answer. Another question I have is, what exactly does Tesla mean by "hertzian" waves, I'm assuming that that his "non-hertzian" waves are longitudinal waves, but I could be wrong. A little background on the question... This question arose when I was looking at the 'ible "spooky tesla spirit radio"  (something along those lines, I'm not sure the exact name). I read somewhere in the comments section that Tesla found Hertzian waves to be, for lack of a better term, a waste of time. This brought the question of different waves up, and one thing led to another and here we are!! Thanks for any and all answers!!

Question by arhodes18   |  last reply


Does a magnet get attracted... Answered

Does a magnet get attracted to another magnet outside of the glass of acid while the first magnet is inside the acid?

Question by Mr.Science Projects   |  last reply


How to make magnetic ink?

Question by Dustc53   |  last reply


Earth Magnets vs Electromagnets?? Answered

I have an earth magnet/ neodymium magnet that is pretty strong as far as pulling power is concerned but would an electro magnet have more pulling force or power. Its a small enough earth magnet that fits in my pocket. Thanks. AL.

Question by alsports2000   |  last reply


Easiest method for magnetic levitation? Answered

I have a ring magnet of about 4 cm diameter and additional magnet pieces. for my science project, i want to suspend one magnet in the air WITH OUT ANY SUPPORT. how can i do it? what are the factors affecting the stability? can anyone tell me the simplest way to perform that? what other shapes of magnet will i need to do that?

Question by allsparkunleashed   |  last reply


Earth magnets vs Electromagnets ? Answered

If I have an earth magnet in my pocket but I want a more powerful magnet would an electromagnet be more stronger?? Thanks. AL.

Question by alsports2000   |  last reply


Electromagnet using permanent magnets

Hi All, I'm attempting to make a very small strong electromagnet using permanent rare earth magnets. I want to boost the magnetic field and increase the magnetic force. The magnets are 10mm in length by 5mm in radius. I have 0.4mm2 enamelled solenoid wire for the winding. My questions are, Is it possible to increase the force of a permenent  magnet? Will the induced flux into the magnet compile the force or will the EMF have to be greater to see an effect? Will paralleling two windings make the EMF stronger? As the magnets are small I have limited room to wrap windings so is there a more effective method? Any help would be great!

Topic by JimmyM5   |  last reply


Drilling rare earth magnets? Answered

Is it safe to drill holes in rare earth magnets? Is the dust toxic or anything like that? I have an idea for a project but it would require drilling holes in old hard drive magnets, but if it is going to make me ill or kill me I'll find another way to do it.

Question by RadBear   |  last reply


Long range magnetic field?

Hi,right now i am stuck with my research.I want to make a long range magnetic field 14 m (approx) please help me 

Question by ajose4 


toaster magnet failing to energizing?

I seem to have power through the PCB but the magnet will not engage to hold the carriage down. Could it be the IC ? 

Question by Westside Christian Fellowship CentreP   |  last reply


Is this the best NdFeB magnet deal?

 I'm doing a little informal research to find the best deal in neodymium magnets. The price per cubic inch seems to be extremely variable- some on the order of $10 and others in the hundreds of dollars. Can you find a better deal than I did? Conditions on the order of NdFeB magnets: * Total price, including shipping to the US,  under $30 * Contains at least four magnets with intact coating * Contains a total of at least 6 cubic inches (98322mm^3) of magnet  The best I could come up with is $4.93 per cubic inch. Can you find a better unit price?

Question by NobodyInParticular   |  last reply


Super Magnetic Senses, Achievable?

If I combined Prank's tutorial on magnetic senses with an electromagnetic coil, could a more acute sense be achieved? Also, how would one go about making it look less conspicuous than a battery and a nail duct taped to your hand? And, would one be able to sense a Ferro fluid with this sensory upgrade, or no? Thanks in advance for the answers, and I apologize if my magnetic ineptitude put a damper on your day.

Question by geckits 


Are there magnetic dc power connectors ?

I want to buy some magnet dc power connectors like the ones on macbooks.  I am not going to use them on a macbook.  It will be for a quick release for my bicycle light.  I have searched the internet and have not found any, but they must exist.  they would be so useful for my project.

Question by Noblenutria   |  last reply


need equation to repulsing magnets

I would like to know the equation for the repulsing of magnets I have a science project due and can't find the equation the internet kind of goes around the bush. If you can answer this as soon as possible  please I really hate to turn it in late. So if you have ANY helping ideas search tittle above                                                -caleb griffin-mose

Question by awe80me_k1ng   |  last reply


Voltage multiplier and magnetic force?

Does magnetic force affect how much energy is multiplied by per section in a voltage multiplier like the one in this instructables: https://www.instructables.com/id/Build-a-Variable-High-Voltage-Power-Supply/ ? I was thinking of making this multiplier and to make it a bit more variable to make a voltage multiplier (electro-magnets around the capacitors) like the ac voltage muliplier on sparkbandbuzz.com

Question by pmk222   |  last reply


Shocks w/ electro magnetics

Hello Every one this is my first post, and since I am a full time student, full time para legal and full time parent, I'm just going to throw this idea out there and let others build on it. Its just an idea that I have had for years. Concerning electro magnets and shock absorber for your average car. Let me know your thoughts. My main thought is that the magnets would be working with reverse polarity add in electricity and you have a pretty good repelling force for going over those bad Jersey roads. Let me know your thoughts.

Topic by arkburn   |  last reply


Copper and magnet electricity generator

For a project in school we are designing a simple electric generator using copper wire and a magnet. The output i'm aiming for is 15V .The fixed criteria for Faraday's law as followsE =( NBA ) / T T= 3 seconds N = adjustable A = adjustable B = Neodymium 1.32 T so how do i chose my copper wire? what diameter? what kind? how do i keep the design not so BIG . How do i increase my voltage output by using a double coil system?

Question by CharithH4   |  last reply


Selectively magnetized (hemi)sphere

Hi everybody! I'm looking for a way to construct a hemisphere, - maybe 1.5" to 2" in diameter - ideally with no moving parts - where any of a number of areas on the surface could be magnetized at will I thought of having an array of tiny electromagnets starting from middle and radiating to under the surface, but frankly, that would take a long time, and I figure there would be insulation issues. Any suggestions?

Topic by drmab   |  last reply