Search for Magnetism electromagnetic electromagnet electromagnetism in Topics


Electromagnet? Answered

Hello smart People of Instructables. I want to build a very powerful Magnet, i planned on using a microwave transformer. Heres my question: Can i plug the Transformer into my house electric? Im in Europe so we got 230V AC. And will the Magnet get stronger or weaker if i wrap really thick wire around it? Thanks for you Answers

Question by ReeVolt    |  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


Prewound Electromagnets

I want to make a wind turbine but I suck at coil winding. Where can I get prewound coils?

Topic by gimmelotsarobots    |  last reply


Coil/Electromagnet

Is there any difference between a coil and electromagnet? So, is saying that a dynamic speaker has coil as correct as saying that it has an electromagnet?

Question by .Unknown.    |  last reply


Electromagnet Trouble

I'm in the development stages for my entry into the Launch It contest. Right now I'm just experimenting (or trying to) with scale electromagnets. I'm using solid core insulated copper wire from RadioShack, and a nearly fresh 9v battery. I tightly wound the wire around a finishing nail, which happened to already be magnetic, but am not getting any improvement in the magnetic field. It seems to be the same, weak size. Am I doing something wrong, or do I just need to step the size up? Thanks!

Topic by Bran    |  last reply


electromagnetic gun

Can anyone help me makig an electromagnetic gun, to shoot projectiles at high speed using magnetic wire, capacitor etc, from where can i get a 300 volt capacitor = not from camera =,,,,,,,,,please help guys.......

Topic by ayushdubey12    |  last reply


Electromagnet Amp

I need to build an amp circuit for an electromagnetic signal, but I don't know much about amp cicuitry. I am goin to amplify a 7800 Hz siganl from an mp3 player through a coil. I'm making one of those cart locker things. Any ideas?

Topic by gimmelotsarobots    |  last reply


Help with electromagnet

I have made an attempt to make an electromagnet.I got a 10 inch iron rod with insulated copper wire wrapped around (see image)I didnt have enough wire for the whole rod, so the wire is in two seperate sectionsI tried a AA 1.5v battery, two AA 1.5v, a 9v, two 9v and a big 6v plugged in both ways (negative, positive).None seem to work.I thought it may be the two sections connected together, so i tried all the above batteries again on only one section, and it still didnt work.Can anyone help me out here ?

Topic by oxidase    |  last reply


Electromagnetic attraction

The site in exasperating to use. I tried to past my question but it doesn't work either, so I attached it. Please let me know. Thanks.

Topic by Bretina    |  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


Need assistance with an electromagnet? Answered

Hi, let's say i have a permanent magnet and an electromagnet The permanent magnet is strong probably 50-100mt, the electromagnet is week less than 10mt, (the electromagnet being just a loop of wire, nothing inside, just air) I need the electromagnet to capture all the lines of the magnetic field of the permanent magnet and thus make my electromagnet  stronger, They can be placed at a distence of 3-5mm from each other I can isolate them and put them in an environement where once activated the electromagnet would offer to the permanenet magnet a path of least magnetic reluctance Since the electromagnet is weaker (and probably has less magnetic lines) will it still be able to capture all the  lines and strength of the permanent magnet and direct it with almost no losses to the other end of the electromagnet (cause the electromagnet is quite long ) How much weaker can it be untill it becomes useless in capture and directing the entire field of the PM (10 times, 100 times)? Any advice? Thank you in advance for your assistance

Question by Elys    |  last reply


Schematics to the Electromagnetic Floater?

Could anyone please send me the circuit schematics to the electromagnetic floater?(https://www.instructables.com/id/Electromagnetic-Floater/)

Question by .Unknown.    |  last reply


ElectroMagnetic Pulse Generator

Does anyone know how to make an electromagnetic pulse generator and im not talking about an EMP

Topic by cvm726    |  last reply


2 Tesla Electromagnet? Answered

I need ideas for a 2 tesla electromagnet. I am trying to make the strongest magnet possible without additional cooling from a fan.. I don't know whether or not I can use high voltage, and low amps, or High amps, and low voltage. Or even inbetween.. Also, throw me that calculation for the electromagnetic strength. And if you could be awesome, explain to me how to use that formula, as I am not mathematically inclined. Thank you.

Question by Justdoofus    |  last reply


Electromagnet battery options?

I am trying to power two dc electromagnets, the specs are: 5.5 lbs of lifting force 12vdc, 3 watts continuous duty what are my options for a battery power source?  Im having trouble figuring this out since i'm new to all of this. Any help would be great thanks!

Question by chrisack    |  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


Microwave transformer electromagnet?

Hi so I was bored and decided to make an electromagnet out of a microwave transformer by taking the secondary off and keeping the primary. I hooked it up to some 9v batteries and stuff but it wasn't that strong so I researched it a bit and found out you can hook it up to the transformer input voltage (which was 240v AC) so I did but when I turned it on it made this very loud buzzing noise and I thought I saw what looked like flame in the socket. I turned it off imediately and unplugged everything. Whatever the magnet did must of been strong because it broke itself apart slightly. I tested the sockets with a multimeter and they still say 240v but I just want to make sure I didn't do anything bad to it. Also did anything actually go wrong or was this all meant to happen?

Question by jlandreth1    |  last reply


Strange Electromagnet Observation

Hey everyone. I'm fairly new to the hobby electronics world, and today I decided I'd build an electromagnet. I wound my coil around a steel bolt, and I used 3 Duracell AA (1.5V) batteries for a power supply. When I turned on the switch, I found that my beautifully wound coil took a little bit of prying to get it off of the metal base I was working on. I thought "Let's try 9 volts!" So I grabbed a Rayovac 9V battery that I had around and hooked that up in place of the 4.4V (measured) bank. The Rayovac measured to be ~9V. The electromagnet was noticeably weaker. When I tested my magnet with just one of my 1.5V batteries, it felt like it had similar strength to the 9V battery.  Can anyone explain what might be going on? Short of that, could someone tell me how to measure the current coming off of each power source?

Topic by TheMike25    |  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


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


Electromagnetic field generator

An electromagnetic field generator strong enough that can disturb the tv signal of your neighbour next door

Topic by SalemSnaKe    |  last reply


Building an electromagnet. Help anyone?

Hi all. I'm looking to mess with ferro fluid but I'm wondering exactly what kind of magnet I'm going to want.  From what I've looked up anything under 3000 gauss and I might as well get a rare earth magnet.  So obviously we move to electromagnets.  Basically what I'm looking for is help to create an electro magnet with these three criteria maximum gauss, minimum effort, and moderate safety.  I'd rather not have it get hot and burn myself.?

Question by djvbb12    |  last reply


How to power an electromagnet? Answered

Is it better run an electromagnet of a bigger voltage(12V) with a smaller current(150mA) or with a smaller voltage 5V and a bigger current? Which will heat it up less? Does it even matter? The electromagnet will have to work for several hours so heat is my main problem. Also should I use thicker or thiner wire? I'm trying to build a electromagnet for a ferrofluid project.

Question by odvratno.zgodan    |  last reply


Electromagnetic Floater/Levitator? Answered

Has anyone tried building this electromagnetic floater, and had it working? Because I'm trying to make it, except it doesn't work for me....I don't know whether it's the circuit, or just me. P.S; Are most of the circuits on this website reliable?

Question by .Unknown.    |  last reply


Control of 25 electromagnets

Hello Everyone, I'm looking for a controller to manage 25 electromagnets. I've managed to come up with a driver circuit to energise each individual electromagnet using an N channel eMOSFET in parrallel with a diode. I need a programmable controller to operate the gate of each eMOSFET but the controller must be capable of managing all 25 switches. thanks for any suggestions in advance.

Question by wameri    |  last reply


Help with making an electromagnet Answered

It’s not as simple as it sounds I need to make it pick up things ( screws maybe screwdriver)and I need to be able to hide it somehow under my sleeve so I can trick people in to thinking I have magical powers.

Question by zack.008    |  last reply


hearing electromagnetic stuff

Well, I was going to plug my ipod into some old computer speakers. my thumb touched the tip of the jack (ground) and it makes a buzzin noise. Big woop. No, as I go to reach my ipod it makes a big buzzing noise. what I was hearing was the electromagnetic waves. I reach for my cell phone and then a loud really highpitched noise ccame out. I waver my hand over my computer's power supply, I here a loud buzzing noise. How to do this: press tip of thumb to tip of 3.5mm jack turn your speakers up pretty high waver hand over complex electronics boy, do i have fun mornings, lol, being sarcastic

Topic by guyfrom7up    |  last reply


Electromagnetic induction questions.

OK, this is another one of those questions I should know, but don't.  Mainly because I have never done it before, I have a whim to build an electromagnetic launcher, something table-mounted with a range of around 3-5m (10-15 feet).  I'm not after launching nails through Coke cans. I have been browsing the web, and the designs all seem to be much more complicated than is really necessary for toy. The image below is a scan of my badly-drawn thoughts of how simple it should be. Have I got that right? I plan to use a bunch of capacitors harvested from dead electronics and connected in parallel.  Is there a recommended total capacitance for such a device? If launching a ring, must the ring slide over the ferrous core, or would there be enough umph to launch a ring balanced just past the end of the core?

Topic by Kiteman    |  last reply


How to measure electromagnet by Tesla?

I will be doing an experiment how powerful the magnetic field of an electromagnet, and my guess is the more you twist the wire the more power it generate. But i don't know how to measure the magnetic field by using the unit Tesla.

Question by defineSCIENCE    |  last reply


How to power a strong Electromagnet?

I want to make a fairly strong electromagnet for general use but I also have a task in mind. I live in an apartment building near some students and someone egged my window. The egg dried in and now I can't reach it to clean it. I've see magnetic window cleaners before but they are cheap, weak and not up to task so I'd like to make an electromagnet to help with the scrubbing action. The windows are double glazed and the neodymium magnets I have are not strong enough. The only electromagnets I've ever made were the basic science experiment type, coiled copper around bolt with a battery to power. For this I assume I'll need a large battery or would it be mains powered? Any suggestions?

Question by nodnodwinkwink    |  last reply


Layers V.S. Length; Electromagnets ? Answered

Ok, so I am going to be working on a project that involves electromagnets and the on thing I have never gotten straight is this: To make the most effective magnetic field possible do I make the (hypothetically) 100' of wire a long coil with only a couple of layers or 100' of wire a short coil with many layers? I have always come across conflicting views on if length improve the fields or weaken them. Any insight would be helpful and if you could also provide a good reference site for these types of questions that would also be appreciated. 

Question by Jayccob    |  last reply


Electromagnet Help! How to Make a Small but very Strong Electromagnet???

I need you help smart people of Instructables!I need to make a small Electromagnet, that uses minimum power (by that I mean the battery), but still has to be very powerful. I have a couple of questions that I need you to help me answer:Does the number of coils that is wound to the metal bar effect the strenght of the electromagnet?Does the wire gauge (20,24,28,30,34,36 wire gauge) make a difference is the strenght of the magnet?Does the voltage I supply to the coil effect the Electromagnet?What type of battery is best for an Electromagnet (AA, AAA, C, D), and what voltage (1,5V, 3V, 4,5V, 6V, 9V) ???Here is the thing, I need to make the Electromagnet super strong but taking up the minimum of energy, for example, just 1,5V. The things that are not important to me (doesn't play a factor in my device) is the number of wire winds to the metal rod and the wire gauge! So is it better to just make 1 or more (3,4,5,6...) layers of wire winds???Is it better to use thinner (36 gauge) or thicker wire (24 gauge)???Thank you a lot!Stanislav

Question by comodore    |  last reply


If a person can feel magnetic fields does that mean they have electromagnetic hypersensitivity? Answered

I want to know cause I have a reletive who can feel magnetic fields from magnets.

Question by nerd7473    |  last reply


Creating an electromagnet as powerful as an NeFeB magnet with same size

Is this possible?So I'm working on this project on levitation using superconductor and strong NeFeB magnets. I'm try to determine the possibility of replacing the magnets with electromagnets equally as powerful and of the same size if not smaller. But I'm bit skeptic about the idea as I'm not sure how possible it will be to construct such electromagnet (or buy them preferable). Is this something that is possible? can anyone reading this give me recommendations? thanks

Topic by gjimoh    |  last reply


Magnetic Field for hollow core?

I am working on a project in which I have to control a small setup at the end of a motor shaft using an electromagnet. The electromagnet needs to be around the shaft inbetween the setup and the motor. So I have used a metallic ferromagnetic spool(image attached) and wound 32 gauge wire on it to make it an electromagnet and put the shaft through it. Since this core made out of spool is hollow, I'm not sure how the magnetic field will behave. I tried powering up the one I made and it' seems to be both attracting and repelling a magnet's pole (edges attract while centre somewhat repels). Anyone got any idea about this?

Topic by Antzy Carmasaic    |  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


can you make two electromagnets attract?

Just wondering. because they are like permanent magnets when used right? and can you make them repel? cause that would be a cool point maglev system

Question by bufalloo    |  last reply


electromagnetic pinch effect demonstrator

Greetings, Instructors! I've done some searching in the Technology section already, but (as you know) it's huge, and I didn't see anything that was close enough to what I'm looking for except the electromagnetic coil gun. I want to replicate a demonstrator I saw, once upon a year, at the Smithsonian Institution. A thin-walled metal tube was dropped into the spaces inside two stacked, separated coils, as if it were an axle for a pair of wheels. A brief, large current was then run through the coils; the induced currents in the tube produced the "theta pinch" effect, crushing the regions of the tube that were within the coils. (The machine was set up to sell the products for a token price; the impressively crushed tube was dispensed as a souvenir.) I need advice on the type and capacity of capacitor, thyristor, power supply, etc. to employ. Has anyone here built one, or know someone who has? Thanks!

Question by Argent47    |  last reply


I want a powerfull electromagnet?

Dear friends, For my thesis, I need a strong electromagnet. How can I made it? It must be as strong as possible. Thank you so much. Best Regards. Reza

Question by mbc711    |  last reply


[IDEA] Would this work? Answered

Hello, this is a theoretical question, as i have neither the time nor the money to do it. Assuming that your electromagnet would not melt with the power of the lightning and is made of suitable electromagnet material (copper wire and soft iron?). What would happen if somebody connected a large electromagnet to a lightning rod and to the ground? I do not know much about this field of physics, so please explain your answers! thanks in advance, jonathan

Question by jonrb    |  last reply


Can you use Electromagnetism to 'Boost' the power of a permanent magnet like rare earth magnets? Answered

Simple question. Also if so how much of a boost per volt/winding.

Question by draghi    |  last reply


What is the best design for an electromagnet in a pulse engine?

I am a complete bigger to all magnets, electromagnets, and electronics in general. Recently I've had an interested in different electric motors and have been looking into trying to make a pulse motor that is both efficient and powerful. To do this I want to be able to have the best arrangement of the magnetic fields of the neodymium magnets on the spinning disk and the electromagnets on the outside. I started playing around with the magnetic calculator found on https://www.kjmagnetics.com/calculator.asp but I don't really know what I'm looking at, just that different shapes and sizes have different fields and strengths.  Since a pulse motor is built by using an electromagnet to repel a neodymium magnet, what would be the best design for a strong burst electromagnet in the direction it's repelling the neodymium magnet? Also, what would be the best shape for the magnet to have the biggest repelling effect from the pulsing electromagnets? 

Question by AlanR18  


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 coil design, effect of wire AWG and turns.

I made coil of core length 28 mm and wire gauge 38 and 1850 turns but i am getting very less magnetic compare to other coil of core length 21mm, 28 AWG and 1000 turns. Could you please sujjest what might me the problem. And current we are giving is up to 0.5 A.

Question by ಗುರುತ    |  last reply


how far can an electromagnetic field reach?

For my project I need to know how far electromagnetic fields can reach. I am guessing its related to power and materials, but perhaps there is some kind of rough formula for calculating potential reach? By reach, I mean, how far can the magnetic field reach and attract (move) something, like metal fillings. Also, is there anyway to know how quickly a magnetic field can move something. In other words what speed will metal fillings move at when the electromagnet is switched on? Thanks all, Joel (the snow athlete)

Topic by snow athlete    |  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



Electromagnets, I'm wanting to make a magnet powered by a 1000W computer psu? Answered

How can I make a electromagnet that is powered by the 12v line on a 1000W psu from a PC? It needs to be as small as possible, it also needs to be as strong as possible it needs to carry around 200gr of weight, and I'd like to have it on for arround 2-3 hours without any possible dangers. Please explain me as much as possible?!

Question by trucker her    |  last reply


Can you use standard choke inductors as electromagnets?

I am making a project where I need very small electromagnets to attract and hold a small metal flap closed when the circuit is turned on. Flap is about 1cm from the magnet and returns to this position via a spring when the circuit is off. In theory is it possible to use inductors used in electronic circuits (for interference suppression etc.) as an electromagnet? Thanks.

Question by laquermonkey    |  last reply