Electromagnets Definition and 87 Threads

I am wondering if it is possible to use two electromagnets oscillating at about 1 ghz to suspend an amount of ferrofluid in an acrylic chamber. As I understand it, 1 ghz should be sufficient enough to get the ferrofluid away from each magnet, as after a quick google search, magnetic fields move...

Consider 2 similar solenoids/electromagnets with appropriate iron core with the following parameters: core Length (L), core Radius (R), electromagnet wire diameter (w), number of turns of wire/winding layer on the core (L/w), number of layers of winding (K), total number of turns ((L*K)/w)...

I was reading about high temperature superconductors expelling magnetic fields (Meisner effect). I was curious if this only works with permanent magnets or is there similar effects with electromagnets. I assume since the magnetic waves would be similar there would be a similar reaction, but...

Ok I’m trying to understand the right hand rule in relation to electromagnets. Since I’m a visual learner I made myself a little diagram. Is my little diagram correctly showing the flow of electrons relative to the magnetic poles? Also does the core and helix being slightly curved affect the...

A small coil is moved forward (without turning) between the poles of the electromagnet. Does an electric current develop in the coil? Explain the answer

Mission: create a pair of electromagnets which always connects (angel) perfectly together. Initially, I design with the following 3 ideas, could any design possible to achieve? 1) First idea is to separate 5 iron core, all close to the edge and connect to the battery source. this attempt is...

This is home project that I have wanted to do for years. I know I will have to build a lot of them to get what I need. I am hoping to find some software that will help me. I have looked and I can not find any electromagnets that will work. I will have to have odd shaped cores and they will need...

Would the model in this diagram be able to keep the object stationary provided there is enough current? What equations would be used to calculate the forces acting on the object from the electromagnetic fields? -The object is equidistant from the electromagnets - The object is separated from the...

Hi there and thanks to anyone who responds. I am creating a DIY project that is getting a little complicated for my knowledge. Specifically, I need to have three electromagnets hooked up to a sequencer or a timer of some sort that supplies equal power to one electromagnet at a time, then...

Let's assume you have two electromagnets. One has wire with a 1mm diameter and the other has half that diameter 0.5mm. Assuming they both have the same mass of wire which would be stronger or better? Also if my goal was to attract an object, would it make more sense to have two thinner...

I would like to receive some input about this "equation" formulated by me, a=f(i), regarding a system with a permanent magnet and an air core coil acting as an electromagnet, as described in the image: I understand that the acceleration provided to the toy car will be a function of the...

I have two homemade electromagnets and I need them to repel each other (essentially, be able to physically spin around). Each feels about as strong as a decent fridge magnet when connected, however when I put their opposite poles next to each other, they do not repel - they only feel like...

I am currently working on my high school's upcoming production of Beauty and the Beast. In the musical, there is a rose which loses petals at specific moments in the script that represent the castle's inhabitants slowly becoming less human. I figured that one of the best ways to do this remotely...

I don't know if this is the right place to put this, but I am very lost as of right now. I am doing my 11th grade physics project on magnetic levitation. From what I can understand, there are 2 "main" types of magnetic levitation, them being with superconductors and with electromagnets. For the...

I'm trying to understand the repulsive forces of solenoids. This is all paper as in I don't actually have them to test in real life. Take two solenoids that are equal to each other. Specifications: current is 10 amps Number of turns is 300 Iron rod is 12 inches/ 304.8mm, with a Radius of 2...

My little home made air-core solenoid makes 1.5T, why is it that superconducting electromagnets often aren't stronger than one would expect. Take the japanese maglev train for example: http://www.supraconductivite.fr/en/index.php?p=applications-trains-maglev-more According to this article the...

1. The problem statement, all variables and given I do not have a clue where to get the information to built a DC motor with four electromagnets Homework EquationsThe Attempt at a Solution

Hi all, First post, be gentle... I'm trying to build a system based on the MIT Actuated Workbench. They used electromagnets with the following spec: 1.9cm (0.75”) diameter x 3.8cm (1.5”) length, wound with 32-gauge copper wire with a total length resistance of 120-122 ohms, with no metal...

We know that the attractive force between the opposing poles of identical permanent magnets is a product of their field strength and that the total force diminishes as the distance between them increases. If we assumed the magnets to be point entities, the formulation is the same as that for...

Hi, I study physics and I know what the concept self-inductance means, and in one of my study books, a figure like this was used to explain the self inductance in a coil As shown in the figure, two electromagnets are connected together and the current is passing through them and would produce a...

I am just curious whether the formulas that apply to 'magnets', such as the formula for the magnetic field of a dipole (as brought up in my previous thread), apply to both electromagnets and permanent magnets, and other types? Is the magnetic fields exhibited by these different forms of...

Hi All, I was wondering how I would go about creating a circular maglev track using electromagnets? The idea is to have more control over it and to eventually write a piece of code that would allow changes in the strength of the magnetic field potentially? I was just wondering how it would work...

I am currently working on and electromagnet experiment with my 8th grade students. I have been given an experiment where we build a basic electromagnet with an iron bolt, enameled wire and a 6V Alkaline Battery, (lantern battery). The goal is to test the strength by picking up BB's...

How strong, approximately, is the magnetic field, on a powerful electromagnet, that you buy on eBay, that can lift, say, a 100 kg?

This is a new one one me: http://www.iflscience.com/physics/4-examples-relativity-everyday-life

I am supposed to make an electromagnet for a project. how will i know what gauge of wire to use and how many turns do i need so that my electromagnet will only get 100mA of current from a 24V dc source? Thank you!

I am looking forward to know how to calculate the force between 2 electromagnets. what is the formula to find attraction and repulsion forces between them ? Thank you.

First this Q might be trivial thus apologies. Consider two bar electromagnets that can simulate bar magnets M1 and M2, placed end to end at distance D apart (North Pole of M1 facing South Pole of M2). Magnet M1 is 'fixed' to a base. Assuming both electromagnets have the Current I1 and Voltage...

When you have a metallic ball hanging from a electromagnet and you disconnect the electromagnet, there is a delay between the moment you unplug the machine, and the ball starts falling. Why does this happen?

Hello there, people! I am quite new here; in fact, this is my first post. I am quite strange to this place. Feeling kinda welcome, though. Okay, so short to the point. I am an 8th grader, and my school just started teaching us about electricity. Well, the basics. I knew much about it, much...

Would it be possible to operate an electromagnet using the power produced by pedaling a bicycle? The electromagnet would need to be strong enough to lift up the training wheels of a bicycle.

I am working on a lot of things with electric motors, and many other electromechanical devices. Any textbook comes to mind?

So I'm trying to build some electromagnets and i have some questions regarding how to power them. Imagine that i have a battery of 6 Volts and a coil with x gauge with y meters of wire that will equal 1 Ohm of resistance. So if i want to run it with 1 Amp of current i just put one 5 Ohm's...

Flywheel? I don't know much about magnets, but if i used magnets on the out side of a flywheel and the inside of the flywheel caseing which repel each other effectively crushing the flywheel to oppose centrifugal forces. Would this creat greater resistance on the rotation of the flywheel? Thanks

Dear EE'S! I need help -- sizing electromagnets Is it possibile to built different electromagnet's sizes, that can produce the same magnetic field and forces(e.g attraction/repulsion)? If so how can I do that? By following this law: B = unl By controlling the number of turns or the amount of...

Hello, I'm Zach. Nice to meet you I have an idea I'm trying to work out in my head but don't have much experience with magnetics, especially electromagnetics so I'm helping someone could help me out a bit What my end goal is is a essentially a tube full of magnets that acts like a spring. If...

First off, hi, I'm new. Sorry if this is not the right board; I was unsure between Classical Physics, maybe Quantum since this involves fields, or Electrical Engineering. On to the question, say you have an electromagnet with an iron core. As I understand it, a magnetic field acts on a...

I am curious to know, why on a electromagnet that the wire coming in is on the opposite side to the wire leaving? Is it due to the way the current comes in and leaves, as in the anticlockwise field in the north so incoming and the outgoing is clockwise south. When I say a electromagnet I...

sorry if this thread is in the wrong place.. basically it's to do with electro magnets.. can you control the strength of them by something like a pedal? as in if you gradually push it the strength gradually increases? also would it be a health risk if you were right next to electromagnets...

Hi guys, What I am trying to do is to create a mathematical model for the attraction forces between two or more electromagnets placed parallel to each other. (when the exitation currents are static) And for this i thought the best approach would be to have a model that can provide a 3D model...

I'm trying to get a steel tuning fork to remain vibrating at its designed frequency using an electromagnet. Is there any correlation between the strength of the electromagnet and frequency of the tuning fork, or is it more dependent upon the type of steel, size of the fork, distance, etc, etc..?

Guys I have a problem. Maybe, it's is a stupid one, but I really need help to comprehend something. I'm writing a report about applications of superconductivity. I chose the MagLev trains applications. Let's say, everything was fine until I read about the Meissner Effect. Now I have my mind...

Running an electric current through a copper wire induces a magnetic field. Wrapping that wire around a ferromagnetic material amplifies its magnetic field (this is the basis on which electromagnets are designed*). This does not violate Newton's first law of thermodynamics because magnetic...

The electrotoirdal effect was recently discovered. This article seems to me to describe it as the translation of a magnetic field without moving its origin: http://www.physorg.com/news/2011-09-physicists-magnetotoroidic-effect.html Is my interpretation correct? And could the magnetoelectric...

The "work" done by two electromagnets It has been said that magnets attract and repel by involving the use of electric fields. If so, how does the shape of the electric field change when an iron bar is magnetized? I would presume that the relative motion of the magnet as a whole is not what...

I have a small physics book that states that if you run electricity throught a magnet it will repel metal. I just want to know if this is true.

Okay, so let's say there is an object with a shaft connected to it. The shaft rotationally spins the object. On the top and bottom of the object are N magnetic fields. Not touching the object or shaft are magnets attached to a solid surface with N fields. Those are within distance to act on...

Linked below for exact specifications. I haven't heard of this one of Tesla's inventions used for anything, does anyone know if it works, surely it does if it was granted a patent? If so why and what is it used for or if not why not? Anyone? Thanks very much! Link...

Question: Describe what will happen when a magnet suspended in the form of a pendulum is affected by an electrical conductor in close proximity. My working: Lenz's Law states that the emf induced in a conductor will oppose the emf of the change that produced it. Let's say I designed my...

What do you think would the world be like without electromagnetism?