Magnets Definition and 538 Threads

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...

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...

Homework Statement Bringing a strong magnet close to an operating incandescent light bulb has the effect of breaking the filament. Breakage might be expected when the extra force on the filament becomes comparable with gravity. Estimate the field strength likely to cause problems with a...

Greetings I've been reading about these magnets such as these: http://www.lanl.gov/orgs/mpa/nhmfl/magnets.shtml Take a look at the pulse durations (it says in notes at the bottom "Total pulse length including decay" It's all nice but I don't understand one thing. How can they make...

Hi everyone, I've been trying to find info about getting an object to levitate and how strong the magnets need to be but haven't had much luck. I'm trying to build a levitating picure frame using permanent magnets rather electromagnets. The plan was to take apart a lamp and put in two ring...

Homework Statement Part A- Charges and Fields 1. Click on the category named Electricity, Magnets, & Circuits, then find Charges and Fields, click on it, then select Run Now!. (You may need to install Java onto your computer) 2. Select Grid and Show Numbers in the green menu box. Place equal...

It is my understanding that the force between magnets relates directly to the shape of each magnet. To annul the shape of the magnet, I am seeking a formula that describes the force between two magnets in terms of magnetic flux density. My Question. If two permanent magnets faced each...

Since everything has to obey the law of conservation of energy, where do magnets get their energy from? They can lift something up through a gravitational field which requires energy. If the energy for a solid state magnet comes when you magnetize it (e.g. moving it with your hands with another...

I figured with how big the internet is, there would be an entire forum on magnets somewhere out there for me to ask my question but it turns out, if it does exist, I couldn't find it. So I figured you guys would be just as good, if not better :smile: I'm building an object that has 2 halves...

I know this is probably wrong and that my understanding of physics is basic. But figured id just share a quirky idea I had and see if anyone can explain to me why it wouldn't work. O.k. Imagine two huge magnets in a chamber. One is positively charged and one is negatively charged. And they are...

Homework Statement The figures below show two different situations where a current may be induced in a loop according to Faraday's Law, with the direction given by Lenz' Law. The magnetic field is shown by the x's in Fig. 2. Select ALL correct answers (i.e. B, AC, BCD) for the current in the...

I want know that can we build a long Permanent magnet for a Maglev way ? Please say that its possible ? (i attached one picture , with that you can understand that what is my question and what is a long Maglev way by a Permanent magnet)

Magnetic Materials - http://www.aacg.bham.ac.uk/magnetic_materials/ Table of Contents History of Magnetic Materials Origin of Magnetism Magnetic Units & Terminology Classification of Magnetic Materials Intrinsic Properties of Magnetic Materials Magnetic Domains Magnetic Hysteresis...

I have read in quite a few places that you can pass a wire through a magnetic field and this will produce electricity. Does the polarity of the magnet have any effect on this or is it just the fact that it is a magnetic field? To be a little more specific, if you had a wire setup next to an...

How are magnets made? I mean how are they made to produce a magnetic field? How are some magnets made to attract and some to repel? And just to know:- Does magnetism got some connection with gravity? Because practically we can notice some similarities.I think I am asking an answer to silly...

Hi there. I got two questions for you: 1- How can I calculate the force of attraction in Newton of two bar magnets of about 5 cm long and 2 cm wide separated by a few centimentres? 2- If I want to reduce near to nothing the attraction of these two magnet (whil still kept at the same...

So i have decided for my physics project to build a magnetic linear accelerator made with half inch ball bearings on a plastic track. The first bearing is rolled and accelerated by the magnet which when struck, launches the ball on the other side due to the momentum of the accelerated bearing...

Hello, I was doing some questions and I thought I was understanding solenoids and magnets in incorrect way.. The question was, what would you feel if you bring a magnet close to a solenoid. I've wrote 2 possibilities, first is that they will repel and the second is that the solenoid would...

Homework Statement A strong magnet is placed on the screen of a television set (permanently damaging the tube). Explain the following observations. a) the picture becomes distorted b) the screen is completely dark where the field is strongest Homework Equations none. The Attempt...

Is it possible to extend the range of an electromagnet? How would one do this?

I know this doesn't pertain so much to engineering but I figured you guys would know best. If you set the magnet next to a cell phone or TV, what kind of damage would be expected?

Hello, I am new to the forum, thus please be patient with me. I have a little bit of a problem... Currently working with magnets. Basically, I need to derive an equation for the attractive/repulsive force between two magnets given a distance between them. The most important thing is that...

1) An electromagnet with north up 2) A paddle 3) A permanent magnet (magnet A) positioned north down on top of the left side of the paddle 4) A permanent magnet (magnet B) positioned south down on underneath of the right side of the paddle Reasoning) If the electromagnet is turned on from...

They pull a lot of pounds in ratio to their size, I was wondering if it would make any difference in the energy output if you replaced the normal magnet with a neodyniam.