Magnets Definition and 562 Threads

Imagine if you had piston in a cylinder. For purposes of this experiment ignore the effects of gravity and friction. One end of the cylinder is capped. On the interior face of this capped end, are 4 magnets around it's diameter. The pattern is -, +, -, +. The piston has an identical...

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...

Sorry for being overly wordy- its just what I have read on the forum about magnets so far the people seemed to be leaving out required details and had to clarify a bunch later, so I'm trying to provide as much info as possible. Ok I'm trying to make a project to make adjustable resistance...

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...

Hello all, First time poster and visitor here. I'm not sure if this is the right place to post this question, but I thought I might give it a try. The other day I came across something that puzzled me. I have one of those inexpensive wall cabinets in my bathroom from Target that comes with...

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...

Do magnets attract objects in a straight line? a.) magnet dipole - magnet dipole b.) magnet dipole - electric charge c.) magnet dipole - metal molecule d.) magnet dipole - charged metal molecule Will any or all of these combination result in a second particle move in a straight line...

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?

Hi I'm trying to build a permanent magnet alternator with a different approach than usual. Most PMAs have a ring of magnets alternating north and south. But I'm wondering what would the field lines look like if ALL the magnets faced one direction? Would it provide a useful magnetic field, or...

When I would send a bundle of tiny randomly orientated magnets through a Stern-Gerlach apparatus I don’t think I would expect the pattern as obtained with silver atoms, displaying two separated spots. So how exactly does the electron spin effect the path of the atoms in this experiment?

Okay this might be a stupid question but here goes. I know that if I place two bar magnets with their N sides facing each other like this: -- -- Then they will tend to move a bit and snap together (if they're close enough that is). I have heard people call this the "potential energy" of...

Can someone explain magnets at the subatomic level to me? According to wikipedia, many of the electrons' spins are oriented in the same direction; what happened to the Pauli exclusion principle? Is it something to do with the electrons being delocalized that changes the other quantum numbers? Is...

if light is elctromagnetic wave, and magnet emits magntic waves, why can't i make an influence on the light? magntic waves, if I'm not mistakening, are the field which all the rays are connected to, and not acting as elctromagnetic waves (rays). so a magnet should influence that field...

how do i stick two magnets against the repulsive force?? Hey guys, I'm a new member on the forum and I have just finished school and joined electrical engineering this year. I would like to know how I can stick two magnets near each other against their repulsive force. For example two...

Greetings, I am trying to figure out how I would design something that produces power using magnetic induction, but I think I've confused myself on some of the ideas and terms behind it. I found data on neodymium magnets from http://www.cy-magnetics.com/Mag_Pros_NdFeB.htm and it seems that...

I was told by my teacher that fire is plasma and that plasma can be controlled by magnets. Does that mean it is possible to effectively use magnets to control fire?

Hi guys. Im reading on some magnetism and I thought, what is the polarity of a fridge magnet? Does anyone have any ideas on how I might find out what the polarity of a fridge magnet is, ie what the field direction is?

how do we distinguish poles in case of a liquid state magnet ..or do they tend to lose their magnetic property?

1. The problem statement Is the magnetic field around the following two bar magnets: |N S| + |S N| the same as the magnetic field around: |S N| + |N S|? 2. The attempt at a solution Yes, but the arrows on the lines move in opposite directions?

let me have the honour of posting this dumb question: does a magnet lose its property if two like magnetic poles are welded together?since like poles are supposed to repel!

An cylindrical alnico magnet is 1/2 inch diameter and 1 inch long. It is magnetized through its length. I realize that this magnet can be magnitized over and over again. But can the poles be reversed if subjected to a machine that magnetizes and de-magnitezes magnets? Also, where can one...

I have a standard 8P8C modular jack (RJ45) and the small clip has broken off. Instead of cutting it off and re-wiring a new one I was interested to find out if I could attach magnets (how I will attach them is not important at this time) to the connector and have the magnets provide the...

Can anyone point me in the direction of good information on magnet's, magnetic energy, magnetic forces. Or does anybody have a good understanding of this? Would really like to find somewhere that I can order magnets. Or better yet, make good one's myself, or find out how to find rare Earth...

Maybe cut isn't the best word, but you get what I mean. Surely if all the negative polar molecules move to one side of the magnet and the positive polar molecules move to the other side, and you cut the magnet in the middle, you shouldn't get two more magnets? I'm still only doing high...

I spent a long time just trying to find the right equation and it was no surprise that I did not understand a variable of it. Homework Statement Why is it that a tower of identical disc magnets behaves differently (is stronger than?) a single magnet. Known: NO NUMBERS Each disk is...

Homework Statement a bar of magnet is hung from a string through its center. A charged rod is slowly brought up into the positions shown(down) in what direstion will the magnet tend to rotate? Suppose the charged rod were replaced by a bar magnet with the north pole on top. N magnet...

Homework Statement a bar of magnet is hung from a string through its center. A charged rod is slowly brought up into the positions shown(down) in what direstion will the magnet tend to rotate? Suppose the charged rod were replaced by a bar magnet with the north pole on top. N magnet...

I was always fascinated by magnets and I never understood, why Earth`s magnetic field doesn`t conspicuously affect permanent magnets. Is it too weak or what?

Amount of force 1 magnet with"x"electric energy can create against an opposing magnet is there a formula which can allow me to calculate the amount of force which can be created by two opposing magnetic fields with a certain amount of electrical current? does the size of the magnet have much...

--- THREE MAGNETS (N-dipole-body problem) --- imagine 3 bar magnets sitting on a table randomly spaced. they are fixed and can not translate, only rotate around their centers , it is 2D situation. there is no gravity, no friction and only forces are magnetic forces. here is a picture where "x"...

I know the answer's no, so what's the next best undergrad major? Ultimately, I would like to be in on the R&D side of things. EE or Physics? Maybe another major? Thanks.

I know that anything casting a field obeys the inverse square law and that field lines are an abstract used to help us visualise the vectors on objects effected by the field. Why is it then that if I drop iron filings around a magnet they sort themselves into neat lines? I would expect that to...

If a cylindrical magnet with a uniform magnet field were to be rotated at high speed along its polar axis (assuming the poles to be at either end of the cylinder) would there be any change or distortion to the shape (ie pattern of field lines) of the magnetic field?

I just needed to know for my work-in-progress hovershoes.

Hello everyone! I have been searching all over the internet for an answer to this question: will moving a magnet within a coiled wire induce a current even if the magnet "stays" within the coiled wire for a matter of seconds? I am planning an improvement to an experiment where a magnet...

Before I get flamed for proposing a perpetual motion machine, I would like to point out that I understand there is something fundamentally flawed in my logic. That is why I am posting this, I want someone to point out to me what I am missing to explain why this won't work. Suppose you have...

I am currently working on constructing a Gauss Cannon using the simple method of some chrome balls with a neodymium magnet on a track arranged thus: 0_____||0000____ so when the ball (0) on the left is released it is attracted by the two magnets (|) and smashed into them, and with the same...