Electromagnet Definition and 372 Threads

If a toy electromagent holds 200 lbs on 2 d cells is that overunity? If not could someone explain it without just stating the 2nd law of thermal dynamics. Also if anyone knows the push against and armature in an electric motor compared to the pull of an electromagnet built for lifting...

HI EVEYONE, NEED TO TAALK TO SOMEONE WHO IS UP ON CALCULATING THE VALUE OF (B), REQUIRED TO LIFT A PLATE OF XXNEWTONS. ALSO ESTIMATE THE M.M.F REQUIREDTO LIFT THE SAME PLATE. ANY TAKERS PLEASE? THANKS

Is there a circuit diagram symbol for an electromagnet? Am I correct in thinking that it is a line with a coil going round it? I have looked all over the web, and cannot find confirmation of this. Thanks, Iceman123

lately i have been really interested in electromagnets. i have been building small ones and i will eventually (at least i want to anyway) build a strong electromagnet (not some toy). from what i understand you can increase the strength of an electromagnet by adding more current, turning the wire...

If we take an electromagnet and then place it at one end of a metal spring, the spring will get attracted to the magnet. Now if at the other end of the spring, a metal bar is placed, the metal bar will get attracted to the spring. My question is that will the spring get compressed...

I am stuck on this homework question and would apprieciate a bit of help please. Put the following sentences in the correct order to explain how the bell works. *The springy metal pulls back the hammer *A current flows through the electromagnet *At the same time, the circuit is...

Hello, Does anyone here know how to make a radial electromagnet? I'm trying to figutr out how I would wind the coils. I want to make a doughnut magnet with a single north pole on the inside diameter and a south pole on the outside diameter. It will be critical that the field on the inside...

Hello all, I'm working on building a resonating electromagnet and I was curious to know what the best core material would be. I know soft iron is a good common one and I've also heard of using ferrite. A third thing I was thinking about was using a magnet as the core but I was cursious to know...

I need to build an electromagnet. I have 2500 feet of 19 gauge magnet wire, and an iron core available. I'm not sure how to get a power supply that would supply enough amps to make the magnet strong enough... Anyone have any suggestions? Caleb

Hey everyone, I'm doing a physics project, and I need to construct an electromagnet with a hollow iron core. I have searched everywhere on google, and checked my physics textbook as well, but have unfortunately found nothing. I basically just need the formula of how to calculate the magnetic...

I am working on a physics project, and I need to build a strong electro magnet. I have previously made many real weak ones simply by coiling wire around a nail and conecting it to a AA battery(1.5V). Can anyone help me make a stronger version. I tried using a powersupply from an old computer, it...

Can anyone tell me how to i can calculate the amount of load an electromagnet will pull. the electro magnet has 3 poles. 1 pole is the centre core of the magnet (N) there are two adjacent poles which are on either side of the coil which are joined across the other (s) end of the core. If i...

I think I remember there being a formula to determine the Strength of an Electromagnet, but I just can't remember what it is, and i can't find it any where. of course the strength will depend on many things, # of coils, current, voltage?, Power? distance away from magnet and other things.

Electromagnet Equation Help PLEASE! I have found many equations on modeling electromagnetic forces but being a high-school student, they don't make any sense to me. what i need is this: i need someone to tell me how i can find out Xgauge wire + Ywraps around Zdiameter(feet) steel core +...

I was wondering if it is possible to pull a hail-size dent out of a car with an electromagnet. I have seen an electromagnet that is 1-3/4" diameter and can hold 700 lbs. Will this do anything or what?

Hello, This sounds like a silly idea, but I am trying to simulate all forces of in the universe on my computer, putting in the correct physics equations for each force, one by one. I was already able to simulate the force of gravity with the following formulas/equations: G = 6.674205043E-11...

I'm in the process of refurbishing a 915mhz 30kw Microwave power supply. The problem I'm having is that the electromagnet coil's water tubing is busted, and so we are having to replace it, and the standard replacement part is somewhat expensive ($2000+) and will take weeks to arrive. I've...

Hello, I have a question concerning electromagnet coils and static electricity. If one were to generate a static charge and store it up some how (like in a Leyden jar or something), and that charge was then dumped over a small electromagnet, would there be enough energy to provide a small...

I know that an electro magnet can have a higher tesla rating when you increase the current or the times revolved around the core but I was wondering if someone could give me an equation or set of equations involving the length of wire, gauge of wire, current, cross sectional area of the wire...

Is it possible to make very small, low power, but high frequency electromagnets and stack them up or inside each other to make a high field strength, high frequency magnet? or does the presece of other magnetic fields cause the same problems you would expect with only one coil?

Few real basic questions about inductors/inductance: As I understand it an inductor is pretty much and electromagnet (coil of wire around a ferromagnetic material). Am I right? I know inductors resist changes in current. The more inductance a circuit has the greater it resists AC. Does...

-Why must you use an iron core to make an electro magnet? Why can you use things like plastic or aluminum? -Why must you wind the wire in the same direction around the iron core to make make the electromagnet. -What happened if some of the wire is wound in one direction and some of the...