Magnets Definition and 538 Threads

Magnets "lines of force are" electrons? So I understand that a magnetic field is defined by the lines of force that go from the north to the south pole...what are these forces? The flow of electrons back and forth...?

Hi guys. I got a unique (non-homework) assignment. I'm trying to model the manner in which magnets interact with each other and the forces that they exert on each other when near one another. I would LOVE to do this in an application without investing the time and effort into a full-blown...

I have been thinking about this for some time and I came up with this.Very very strong industrial magnets will be used for lift and thrust.Every part of the craft will be attached together. No. 1 and 2 magnets will be used for vertical lift.No. 1 magnet is set at its position and can't...

Imagine for a moment a steel core with no air gap, that is driven to saturation by a powerful permanent magnet. Imagine next that a coil is wrapped around some section of that core some distance away from the magnet, such that their only flux linking is through the saturated core. The magnet...

Richard Feynman describes a “modified Stern-Gerlach” experiment in which the apparatus consists of 3 magnets in a row, along the path of the beam. The first magnet is polarity “South on top, North on bottom”. The second magnet is twice as long as the first and of opposite polarity. The third...

How the HECK do freakin Magnets work? I understand that moving electric charges create a magnetic field, but I can't find any explanation that actually describes what is going on, only how to describe what will result of it. ie Maxwell's Equations. Electric charge, and the way they repel each...

Hi, Recently I've become interested in the possibility of using magnets to generate electricity, a "magnet motor" if you will. There are evidence of a lot of different attempts on the internet as well as a number of actual patents for these motors. When I say "magnet motor" I mean a...

Hello there, I was wondering how much force can two opposing negative magnets hold. If you had two magnets levitating for example, how much weight would they hold up. So, I was wondering if there is some kind of equation for this with the strength of the magnets as the variable.

I have two quite powerful magnets that i took from a microwave magnetron. Are there any interesting experiments or activities i could do with them? Maybe be costruct something?

Hi, I am needing some guidance to find a way to calculate the repulsion or attraction force between (magnet/magnet) or (magnet/coil) in kg force. I know there is not a fast or easy answer to this but you will help me a lot if you can help me finding the way to calculate it. thanks for your...

Alright, Could you use magnets to slow matter down enough to reach "near" absolute zero? Heres how it would work. You would have a range of magnets in a chamber, and you would inject the chamber with protons. The magnets are comeing from all directions forcing the proton to stay still. Then...

I know it can't work but can someone explain why? The U thingys are the magnet. So the magnet attracts the fan and it keep moving.

i need to know how to make an electro magnet i can plug into my wall outlet. it is for a project I'm working on and a need a constent flow i can turn on and off. it only needs to lift under one pound. also will a electro magnet work with a north and south like a regular magnets or will it just...

If you take 2 .5" x .5" cylinder neodymium magnets, and attach them sideways with N of first closest to the S of the 2nd and vice versa, they are attracted. However, when one is held stationary, and the other is rotated around, its seems that there is a perpendicular magnetic field that...

We know that light travels through the vacuum of space because it is a self perpetuating system of electronic and magnetic waves. Since this is the case, why do we not see the magnetic wave of light move magnets, or even make a magnet vibrate? Is it simply because the magnitude of the...

I'm trying to build a tesla turbine. I'm trying to follow the instructions here. However, the turbine calls for neodymium magnets, which I can't seem to find. Would other magnets work?

Is there a line splitting a magnet into north and south? What is this line called? Also does the line divide the magnet equally?

I think this belongs here because its about magnets, except for the adhesive part which may be materials. Im improving my refrigerator door magnets that constantly get knocked off or shift around all the time. 1. What thickness of neodymium magnet will saturate a refrigerator door?? For...

Homework Statement You have 2 magnets separated by a distance. The top magnet has its south end facing the north end of the other magnet thus forming a magnetic field. Finally you insert a loop of copper wire (the pic shows a copper tube though) between the two magnets with the open ends...

Magnets "on and off" Is there an easy and cost efficient way to "turn on and off a magnet"? Is it possible? I have a 6x9 speaker magnet (6x9 an old 80's style car speaker), the magnet itself is about the size of a hockey puck and I want to be able to "push a button" so I can remove anything...

What factor reduce the magnetization of a perninant magnet

I was surfing digg yesterday, and saw the following post: http://images.wildammo.com/2010/07/24/world-energy-problems-solved/ For those who don't recognize it, it's based off a video game called 'portal'. In the picture, the water falls towards the floor where it falls through the blue...

Hello Everyone, I was wondering if you could levitate a coin using two powerful magnets on wither side of the coin? I mean, if the magnets equally attract the coin(provided they are equally strong), there must be a point where the force of attraction from both the magnets is equal and if that...

hey guys, I've been given an assignment on the topic of eddy currents and magnetic induction. We have been given info that when a magnet slides down an incline over a magnetic sheet, the eddy currents in the metal acts as a braking mechanism (lenz's law). I've done some research and what i...

I've already done an experiment to show that if I take two coils and connect the leads together I can physically move one magnet towards the first coil and it will draw a second magnet towards the second coil. Of course this depends on how you wire the coils together as it can also repel the...

Is it possible to create electricity by spinning a coil between two magents?

Hi everyone, I've been studying magnetic fields and alternating current generators and i have a question i need help answering. I have posted a few other questions in which i posted my generator design with magnet placement and plotted the sine waves on a chart but i have a question about the...

Why don't magnets fly to Earth's magnetic poles? I understand that Earth's magnetic pull must be strong enough to pull a magnet to the pole, but what is the force required for a magnet to get pulled the over their? How does one calculate whether a magnetic field is strong enough in order for two...

Hello, I am working on a project which requires me to find the force between two permanent magnets. The configuration of the two magnets is variable, and they are of different geometries, so I thought the best way to do this would be by using ANSYS. I have never used the ANSYS...

No question, I just wanted to share a thought... I saw a very old episode of Top Gear last night, where he put magnets onto the front of two model cars, and drove them at each other. Because the magnets were orientated so that they would repel, the cars couldn't crash. This was given as a...

Hello forum, How to calculate the force between two magnets at each distance r ? can i use Coulomb law ? Thanks in advance

I am having a problem with my understanding. I could be incorrect, but I think that the magnetic field emitted from a magnet is consistent and doesn't weaken at points further away. Then could someone explain how magnet force weakens with distance. I would also like to know the math so here is a...

The diagram shows a straight wire carrying a flow of electrons out of the page. The wire is between the poles of the permanent magnet. The direction of the magnetic force exerted on the wire is: Please Note: My diagram isn't perfect but both magnets are the same size and the wire...

This is my first post and I am not sure if I am posting it in the right place. But I believe some electrical engineer could answer it better than any other engineer. Please anyone correct me if I am in the wrong place. I am using Neodymium magnets on a machine I am developing. They are...

Can someone explain why a rare Earth magnet is so much more powerful than the lesser magnet? And why is it called rare earth? Thank you

Magnets in cars passing over coils in roads would definitely generate power. There are a few people who think this would be free power. I don't know how to properly explain why it would NOT be free power. Can someone help?

I'm not making any statements here, only asking questions. When I take two permanent magnets and I feel the repulsive force between them, Feynman QED says it is the momentum of the virtual photons "pushing" the magnets apart? Experiments have been done, forcing some of these virtual...

I produce a small wallet size pouch that I have had a lot of problems figuring out how to make it close without impeding on the design of the pouch. The opening is a little over 3 inches. Its used to carry a cell phone and maybe some credit cards. A magnet would be perfect but for anything to...

I produce a small wallet size pouch that I have had a lot of problems figuring out how to make it close without impeding on the design of the pouch. The opening is a little over 3 inches wide. Its used to carry a cell phone and maybe some credit cards. A magnet would be perfect but for...

Magnets repell water? Help! Hello everyone, I am conducting an experiment. I am trying to figure out how to repell water mist from a steel plate. For example, if I take a water misting bottle and spray a steel plate with it, I want the steel plate to repell the water mist. I have heard it...

Good morning wise friends! Its a cold morning here in southern New Jersey, my Labrador Retreiver (Mocha) is at my feet and we're expecting snow tomorrow. (I love snow, makes me appreciate the spring!) O.K., the question. I have heard that two permanent magnets clamped together N to N or...

Hi guys I have a simple question. The attached picture shows 2 Neo magnets with some Mumetal sheilding between the magnets. Let's say the gap between the shield and the magnets is 2mm. So the overall distance between the magnets is 4mm. will the magnets still repel from the shielding...

Hi PF Pros... I wonder if you can help me... I am trying to see if there is a formula for how fast magnets attract. I know that there is the inverse square in terms of power loss and that magnetism is a field that travels at or near light speed. But, for example, if I have 2 cyllander...

Right. I know if you drop a strong magnet down a copper tube (or conductive but non magnetic tube) it falls slowly as it 'sees' a changing magnetic field and thus induces a current in the tube and this induced current causes its own magnetic field to be induced and acts a resistive force to the...

Why do magnets mess up television screens? What is the science behind it?

Hi guys I may have posted in the wrong section. If I have 2 magnets pushing away from each other (one is fixed) the other is on a crank. And the crank is spinning around 2000 RPM (33.33 crank rotations every second) how will eddy current effect the 2 magnets? I have Wikied "eddy...

Would is be possible for electromagnetism so help something escape from a black hole past the event horizon? Gravity is weak compared to the other forces, but it seems only electromagnetism would have a chance as the strong nuclear force is for holding atoms together, and weak nuclear force is I...

I'm doing an investigation where I am trying to find the repulsion force of cylindrical magnets. For this I have two ferromagnetic disk magnets on their sides, so that the curved sides face each other. In the investigation I push one of the magnets with a constant force towards a stationary one...

Three bar magnets are sitting on a frictionless table. They are pinned down through their centers, they can not translate, only rotate, again without any friction - it is a 2D situation, like this: [S- x -N] [N- x -S] [S- x -N] INPUT: initial...

Since magnets cannot be "switched off" without input energy, energy cannot be gained from them(right?). But how do you explain and prove this? If I wanted to tell an inventor attempting to find free energy, how would I explain this to him/her?