Magnets Definition and 538 Threads

I know that magnetic fields can effect electrons in certain ways, but I specifically want to know if a bar magnet just sitting on a desk will attract "free electrons" much like a magnet will attract a paperclip. The reason for this question is my brother is working on a new type of battery that...

Hey guys. Not a homework question. If two magnets have the same friction, same mass, etc. But have different strengths. and they are arranged so that they will repel each other, how will they move in relation to their starting points? Will they both move 1/2 the distance of the...

I wasn't sure where to put this question, since it didn't seem to fit any category. However, because it brings up the topic of virtual particles, I'll ask here. From what I understand, virtual particles can travel faster than light, and it is virtual photons that are responsible for the...

Does magnets posses free energy? Does the machine shown in image will run? If no...give reason... I know it seems to voilate 1st law of thermodaynamics...But why it voilates it?

I was wondering why, when I arrange six cylindrical magnets, about 1inch long and 1/5th inch wide each (neodymium magnets) in a hexagon shape by arranging them into a chain of N-S-N-S-N-S (top or bottom... with the other end obviously being opposite in arrangement) and connecting them into a...

I am trying to calculate the forces between ten small cylindrical magnets stacked (inside a tube so they cannot flip/shift) so that consecutive magnets are repelling. The bottom magnet is attatched to the bottom of the tube with, let's say, the positive pole facing up. Then the second has a...

Things with a magnetic field constantly shed light. This is why a precessing magnet will slow down until it stands straight up, giving it the lowest potential energy. But if the magnet is standing straight up, it has no way to have less potential energy, but I would think that it would continue...

Here's a question I posted about 10 years ago as a member of the forum. No one seemed to provide a satisfactory answer then so maybe someone might have some ideas on the subject: When a permanent magnet attracts an object it does work and loses energy. When the object is pulled away is the...

all i can find on the internet are the attractive and repulsive forces between 2 magnets... where can i find the relationship between distance and attractive force , between a magnet and i.e. a piece of iron?

I would like to understand at a microscopic level why magnets attract or repel each other. I understand that there are tiny loops of currents caused by the spin and orbital rotations of electrons, that there are magnetic moments, but I don't understand why magnets attract. How is the magnetic...

then why has no one built an engine that requires no wires, no copper. no batteries, capacitors, resistors, no electricity whatsoever? if a magnet is strong enough it can push or pull something, right? then why aren't wheels magnetic? generators, engines, rotors, hard drives...why is...

I haven't had any formal teaching on magnetism, so my guess is this is an obvious question with an obvious answer, but I can't produce it myself. Are non-magnetic metals attracted equally to both north and south magnetic poles?

We have an experiment on Hall Effect,in which we place a semiconductor material in the middle of a 2 poles of a magnet exactly in the middle so that a distance of 1 cm exists between the poles. Questions: 1.Why is a semiconductor placed?Will it make any difference with a metal? 2.Why a 1 cm...

My senior project for high school is to prove that NASA can make their launch more efficient by adding electromagnets to launch. I was thinking just magnets lining a tunnel coming from underground that move the payload a lot like a maglev. My job is to make a model of this, and I'd like to make...

I was messing about with a magnet (again), and got a safety-pin which has paperclips attached to it and hung them over the magnet. Most of the paperclips went straight down to the magnet, but some of them wanted to go directly perpendicular, and there seems to be a force pulling them to either...

It is possible for a permanent magnet to be attracted to a cooled superconductor magnet as shown in many experiments, but why does it not attract the permanent magnet to the point that their surfaces come in direct physical contact similar to the attraction that causes two permanent magnets join...

My wife was asking me if magnets are conductors of electricity and I told her magnetite isn't. Then she asked me if an iron rod, after being magnetized is an electrical conductor. That got me stumped. I am thinking by right it shouldn't affect the electrical conductivity of the iron rod...

I don't get it, is the north pole of a magnet the north seeking; having in mind that like poles repel? Please help.:confused:

Hello, sorry for bad english. I have probably a very stupid question :) Let's place two magnets in vacuum (empty space) How does one magnet "know" of the other one, if there is "nothing" between them? How "nothing" that exists between them can interact with magnets? I know of course...

I've a question on ferromagnetism. I've been trying to simulating the field around a rod shape magnet, cylindrical in shape and N on one end and S on the other. I just wonder if one would expect the the B, the magnetic flux density, to be uniform in magnet. I used comsol to simulate and get...

I'm currently an art student and had this idea for a sculpture. The question I have is how would I go about suspending a metallic object in a magnetic field or fields. I understand the idea of it and have seen it used in picture frames and "floating" globes and such, I need to know what...

Hi, I once read (but simply now cannot find the site again!), that if you magnetize a magnet through steel, you can make it thousands of times stronger. Is this when you create the magnet, or does this mean when you build a magnetic generator, you need to attach the magnets to steel to...

Hello, Can someone here settle a debate for me? A friend of mine said that if you hold two neodymium magnets 1" or so apart from each other with attracting ends (N-S) facing each other for prolonged periods of time (years and years), nothing will happen to the magnetic field. I stated...

If I were to use a gaussmeter to measure the strength of a magnet's magnetic field, would the value read be double if I were to stack two (of the same kind of magnets) on top of one another?

consider the image i have uploaded, it shows 4 ring-shaped magnets of different sizes each pair of concentric magnets are held in position relative to each other, and the lower pair is also affixed to the ground, i.e. the upper pair of magnets is free to move blue and red faces show the...

I frequently teach my students about how basic generators work (motional EMFs, Faraday's Law, magnetic flux, etc.). Question: do the generators used at large power plants really use a permanent magnet as a source of the magnetic field? I was thinking that maybe an electromagnet might be...

Hi, I have some very basic question that I've been struggling to find the answer to and before I go and buy some magnets to do some test of my own I thought I'd ask here: Do two magnets of different strength repulse each other at the same strength, or does one repulse the other more...

If I wanted to make bar magnets would I heat up the metal and then place it in a B field of a solenoid and then cool it down in the field to keep the magnetization? It seems if i heated it up first the atoms would be more easily aligned in the B field, And then cool it down to preserve this state.

Do magnets have a longer reach of attraction in a vacuum chamber?

hi gang, Just building a seismometer I have 2 x 2.5cm disc rare Earth magnets spaced far enough apart for a coil of wire to move between them. Would you expect there to be any difference in induced voltage into a coil between 2 magnets when the magnets are orientated to attract or repel ...

Hey guys. A friend and I are planning on making a scuba diver tow device for his trip to the florida keys. We could just put a trolling motor exposed to the water, but at depth I have reason to believe water would push past the seal. So what we are hoping to do is weld up a thin wall steel...

Can permanent magnets be modeled as set of "magnetic charges"? Computing the full magnetic field of a permanent magnet and what forces two permenant magnets exert on each other is obviously a field theoretic problem that requires a solve using e.g. a FEA method or simular. For two idealized...

Let's say I have permanent magnets set up in a sort of half sphere with the inside of the sphere pointing up and it laying flat on a table and then I have a ball with, let's say, half the radius of the half sphere. The ball has the same permanent charge as the half sphere. I place the ball over...

Do electrons continuously flow from north to south pole in magnets. If yes, does this continue to happen when the magnet is attracted or repelled by another magnet or to a ferrite?

Homework Statement For an elastic rod, show that \[ \frac{\partial C_{L}}{\partial L}_{T} = -T*\frac{\partial^2 f}{\partial T^2} where C_{L} is the heat capacity at constant length L. Homework Equations dU = Tds + fdL F = U - TSThe Attempt at a Solution I've used dF = dU - Tds - SdT = fdL -...

hi, I am new to this i hope someone can help i have a small problem with what formula i should use for my project i have this magnetic toy that is called the levitron and it levitates this magnetic top over a bass that is also a magnet. I am trying to find the force between the two...

Hi, I am not sure if this kind of experiment has been performed before. If so, great, I would love to see the results. Anyway, here goes. The double-slit experiments with photons, electrons and even...

Homework Statement I know this is going to sound like voodoo or something. But why do magnets feel easier to attract than to pull away? Let me elaborate. Suppose a south pole and a north pole is near each other, they attract. Suppose a north pole and a north pole together, they repel...

Ok first off do any of you think that magnets could be used to create energy? After all when you put two of the same polarities together they repel. Well could this repeling motion be turned into energy. I have drawn up a way that i believe we could levitate or float a large magnet and what this...

Hello I am new in this forum and also my knowledge on physics is not very good. Now i am trying to understand how the permanent magnets work. We know that if we take ferromagnetic materials and by doing a specific process we can create a magnet. Then by subjecting the magnet into a high...

Homework Statement A metal ring 4.50cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. These magnets initially produce a magnetic field of 1.12T, but are gradually pulled apart, causing the field to remain...

Hey everyone, I am wondering if there is a way to orient magnets so that the field is contained. Little background, i am trying to develop a device that can lift small Fe particles. I determined that a rare Earth magnet will do the trick but i need it to be switchable and...

Homework Statement I want to find this: C magnetic field strength of magnets C magnetic force on ferromagnetic object C force vs. distance C force vs. material thickness (shielding) Various metal objects of varrying thickness's I have a scale I have two permanent magnets...

Hi, Doesn't a magnet attract objects of different mass(consider Point mass), but placed at the same distance from it and of the same magnetic substance, with different forces, similar as is the case with gravitational force with Force=G*mass1*mass2/distance between them^2 ? For example if an...

I am designing an eddy current brake system for use in roller coaster design. I have the flux density required to reduce the speed to what i want it to be. what i need to do from that is work out the dimensions needed to obtain his flux density. the configuration is for identical magnets...

I know a little bit about them already but I don't know exactly just how and why they work. I know that they are caused by movement of electrons/electric charges. I know that when all electrons spin in the same direction we get magnetism, and that in a current of electrons we get magnetism...

I have a feeling that this might sound like a question I should already know the answer to, but here goes. If a man holds a heavy weight up, he's expending energy to work against gravity and keep it there. However, he is not doing work if he doesn't move the weight. A magnet can stick to...

I have what I thought should be a relatively simple problem, but a quick trip around the Google makes me wonder. It might be easier to just ask some real humans for once... I'm working with Hall Effect sensors and neodymium (NIB) magnets. I basically know the strength of my magnets, and the...

First of all, hello everyone :) . Second of all, I'm looking for magnets that are brick-like. They need to be pretty strong. Dimensions, ideally, would be 1" x 1" x 2.5 - 3". Can I get rare-earth magnets that do this? I'm not sure where else I can post this, so if it's in the wrong...

Hello everyone. I need to simulate flux densities generated by thin films of permanent magnets of varying composition. This is to guide selection of parameters for sputtering of Nd-Fe-B permanent magnets. Does anyone know of a program which will allow me to simulate fields from permanent...