Electromagnet Definition and 372 Threads

Hi guys, this is my first time here. I'm currently working on a new design, our team works for Network Rail and we really need your help. Ok here's the problem: I have a magnet, permanent magnet which is able to move only up and down, not laterally. I have another magnet, this time its an...

i have a electromagnet with 200# pull is their a way to get full pull on sheetmetal or is their something i can do to the sheetmetal.

Hello, I have a question from some playing i was doing with an electromagnet. I made a simple electromagnet out of a nail and some small gauge wire (not sure of the gauge). I wrapped another nail with some un-insulated wire of the same gauge and left it un-connected to any power supply. I...

A lift electromagnet has N + S pole on the same side. will it push or pull a permanent magnet which has N & S pole on opposite side? If I have a lift electromagnet and a permanent magnet, both can pull 100 lbs. What is the break away force if I put them together? Thanks

I need to build an electromagnet that is able to pick up 8 ounces from 2-3 inches below it. the tuna cans are magnetic and are full of tuna. I have limited funds but have a lot of wire and stuff at home. the electromagnet will be powered at approx. 7.4 volts. i would like the electromagnet to be...

Hi there PF, I am currently trying to make an electromagnet that is able to turn on and off at about 2-4Hz of frequency and is able to repel small neodymium magnets with about 16N of pull force. I have tried various configurations of coils around ferrite cores. The power supply has been...

Homework Statement This problem arises from a much larger essay/lab/project thing. I know that there is an induced current in the wire of an AC electromagnet because the magnetic field is constantly changing along with the AC current, so it makes sense to me that will produce a constantly...

Hi everybody, I just had 100m of copper winding wire arrive in the mail so I can build an electromagnet. I'm aiming to pull a 5kg weight along, which is already floating on a separate magnetic field so all friction is removed except air resistance. What I want to do is put an...

Hello. I would just like to begin by saying that I am very aware of the vast complexity of the subject of magnetism. Still, I have been hoping to find a way to get a basic idea of how much a magnet and an electromagnet are attracted or repelled by one another. I do not need highly perfect and...

hi i I'm doing a science fair project on how to make electromagnets stronger and i was wondering if you guys could answer some questions. first of all i need to find a good place to buy an iron core preferebly not online, i live in sandy utah in the united states. second i was wondering if you...

What is the difference between permanent magnet fields and electromagnet fields?

Hello! I'm a bit confused by a phenomenon regarding electromagnets with and without airgaps. A picture of the kind of electromagnet i have in mind is found here: http://sci-toys.com/scitoys/scitoys/magnets/calculating/calculating.html If one has a "loopy" electromagnet without an...

When finding for "L" is the value for "l" (length of coil) affected by the length of the core material. Or more specifically when one is working this equation for two coils yoked in series do you figure each coil separately?...and if NOT, do you include the length of the yoke? Here is a link...

I am trying to come up with a design that would track the position of a wire. The wire will have a permanent magnet attached to its tip. I will use a electromagnet to move the wire in only 1 dimension. Here is what I was thinking... I would put a stationary aluminum plate some distance from...

To make your own electromagnet simply use an iron nail wrap some copper wiring around it and tape it to a battery fair enough, the current passing through the wire causes a magnetic field... My question is one of annoyance because my boss won't let me try it with the 100mm Neodymium magnets...

I am starting a rather unique project and thought I would ask a few questions before I get too lost. Basically the project is to create an hour glass that can be controlled so the sand will go both down or up. My first thoughts were to use a series of electromagnets in a pulse series to lift the...

I am trying to design a very powerful electromagnet for experimental reasons. However, I am wondering at his absurd sounding conclusion I arrived at! The governing equation of the magnetic field generated by a solenoidal electromagnet is B = u0nI Provided that I keep these things constant 1...

I was inquiring about how much force will a 1000 lb pull force electromagnet pull at 4-6 inches away from the magnet

Homework Statement To determine a formula that can be used to determine the lifting capacity of an electromagnet/magnet through a known air gap. Homework Equations Weight= (magnetomotive force)/reluctance The Attempt at a Solution From the experiment the following general...

Homework Statement A coil with an iron coil is used as an electromagnet. With 500 loops and a current of 1.5A, it can exert a lifting force of 30N. What force would it be able to lift, if the following changes were made? a) The current is increased to 3.0A. b) The number of loops is...

The electromagnetic force is mediated by photons , which have 0 mass. so electromagnetic forces have infinite range. the weak force is mediated by three intermediate bosons, W+, W-and Z0 particles. these all have mass, the two W particles about 80GeV and the Z is about 90GeV. the bit below is...

Homework Statement Hooking up voltage to a solenoid (coil of wire) creates an electromagnet. Moving the electromagnet in and out of a larger coil hooked up to a galvanometer creates an emf (voltage) in the larger current. Does an emf get created for a *stationary* electromagnet inside a...

Why does an Electromagnet Vibrate ? whenever any iron plate or steel spoon is placed near permanent magnet(not of very high strength) it gets attracted towards it and when it is removed from it it removes easily without any vibration effects. but if the same thing is performed with...

Hello all! I'm new to this site and new to electromagnets. I've done some research but now i need help from anyone who is willing. I'm playing around with electromagnets and neodymium magnets. Now i want the electromagnet to repel the neodymium. So first thing I can't use a ferrous material...

I have this equation for the magnetic field strength of an electromagnet but it’s in the form of multiple polynomials. Here is the page where they all are: http://www.netdenizen.com/emagnet/offaxis/solenoidoffaxis.htm since it gives values for e_8 and p_8 I tried using the main equation up...

hi all, i am currently working on a magnet generator/motor and i have some qns on electromagnetism. i am currently trying to find out how much does my electromagnet (ferrite core) requires in order to repel a permenant magnet, in this case, a cylindrical NdFeB magnet. i have been trying to...

hi all, i am currently working on a magnet generator/motor and i have some qns on electromagnetism. i am currently trying to find out how much does my electromagnet (ferrite core) requires in order to repel a permenant magnet, in this case, a cylindrical NdFeB magnet. i have been trying to...

I'm trying to construct an electromagnet that, when a loose piece of iron is inside the solenoid, will create a field that will attract that piece of iron with at least 200N of force. My thought is that I can fill half of the solenoid with an iron core, leaving space in the other half for the...

I'm making an electromagnet for a contraption. As far as I know all the electromagnets demonstrated on the web are working permanently with supply of battery (Direct current). I need to know how i could make an electromagnet which works on an AC supply with a switch ? Please provide some...

Homework Statement For an electromagnet that is just made up of wires and a core, what power supply can I use other than batteries that let me adjust the volts? Can you explian in detail? Homework Equations none The Attempt at a Solution I have already looked on the...

Homework Statement A nail is placed inside an electromagnet, why do we feel a buzzing sensation? Homework Equations The Attempt at a Solution Is it because of resonance? Can someone please explain? Thanks!

I'm reading up on the equations for electromagnets, and in looking over the Wikipedia page on the subject I'm wondering if it's in error or if there is a flaw in my understanding. Specifically, it says that the force exerted by a magnetic field in an electromagnet on a section of core material...

I'm building pairs of coils with standard core heights and diameters and linking each pair with a yoke. The magnets all run at 6V DC with windings of 24 AWG magnet wire in 6/8/10 layers. Is there a ratio of coil core mass to yoke mass for maximum efficiency? (shown below)

Dear Guru Engineers, I made 650 coils round a ferrite rod of cirumference about 2cm using super thin (like hair) copper wire that is insulated by some kind of yellowish golden orangy 'lacquer'. I hope you get the picture what i am trying to describe here :p Anyways, i used a strong magnet...

Homework Statement I'm in 11th grade and I'm in an honors physics class. Everyone has to do a science fair project and the teacher said that mine is too easy. Mine is which of the following factors affects the strength of an electromagnet the most: # of coils, thickness of the wire, the...

I was trying to get the numbers to design a 1T solenoidal electromagnet with a core of permeability >1000 (electric steel or Permalloy). I think the permeability saturates at some field strength(0.2T?). But I am not sure how to use the formula after saturation. should I just use u0 instead of...

Does anyone know where i can source ferrous iron (rod or bar) from in the UK? This is for a Third Year university project Approx dimensions: 25mm diameter by 300mm long Thanks In Advance Alex

Hi, I would like to know what would happen if you used a permanent magnet for the core of an electromagnet, instead of the standard ferromagnetic core? Can you increase the magnetic field strength of the permanent magnet by putting current through the coil? Also, could you effectively...

Hello All, My name is Nik. I am very glad I found this forum. For the past couple months i have been researching (YES, I do use the search function) information on electromagnets. I have done a lot of reading on wiki so I am familiar with its E.M. page. I am building an electromagnet. Like...

Yesterday I was using a riding a lawnmower and the bolt that held the float bowl fell off in deep grass. I looked for about 15 minutes when I seen a flash of lightning and I figured I better give up searching and start pushing this thing back to the house. This experience made me wish I had a...

Note, that I'm just asking for opinion. I do not fully know everything about everything - I am still in school and I am yet to develop the never-ending knowledge that you guys on here posses. Would super-conducting of space itself create electromagnet fields? Space in the context is being...

Hello everyone, I just joined the forum because my friends and I have been having an argument for a couple hours now over magnetism and its uses. So I will just jump right into our argument... I say that an electromagnet attached to the front bumper of a vehicle can be attached to the...

I am looking for a relation between electromagnet (or permanent magnet) and frequency.For example what is the frequency of an electromagnet that has 45000 gauss electromagnetic field? Thanks.

I have been looking through the forum for help on working out what i would need to build an electromagnet to certain specifications, but as i have not done anymore than a grade nine level physics frankly I don't understand most of what's in the posts. So if you reply can you break the physics...

I'm trying to build a C or H-frame electromagnet that produces a flux of 1.4T in the gap between its two poles. (See: http://cyclotron.lbl.gov/images/Cyclotron%20yoke.JPG ) But I can't find any references on building C/H-frame electromagnets. I calculated with permittivity of free space...

Hello, I need to build an electromagnet in order to pull a disk magnet from a distance of a 15cm. I don't know how many turns and how large to make the electromagnet. I need it to be in the shape of a solenoid. What are the formulas needed in order to do this? Thanks in advance, Shay

Have always wondered this so maybe I can get an answer here: when a large industrial electromagnet is switched off and the electricity-produced magnetism ceases, is there a small amount of residual magnetism in the uncharged electro-magnet? If so, does it dissipate according to a established...

I was wondering if it is possible to make a rechargeable electromagnet like this: http://artpad.art.com/?kmhzngmfdqo Please bear with me as I have poor drawing skills. :grin: It consists of a capacitor, 9V battery, and a electromagnet. Will it work?

I'm trying to build a telegraph key and sounder. The sounder that I have designed (well, saw online) is a metal nail (which is ferromagnetic) with at least several dozen (maybe 200+) turns of wire around it. When a current is on the wire, the nail should become an electromagnet, and then pull...

Hi everyone, Is there a material which, inside a solenoid, immediately or in a very short period of time gets magnetized as current is switched on and then stays magnetized for a while if the current is switched off? For if this were true then this would mean we could derive more energy out of...