Magnets Definition and 562 Threads

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 A baar magnet inserted into a coil of 500 turns induces a potential difference of 1.5 V across the coil. Determine the induced potential difference when; a> 250 turn coilis used. b> the bar magnet is moved twice as fast through the coil. c> three identical magnets...

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...

[b]1. The problem: I am a grade 10 student and I have a physics project. I want to try to stop most road accidents because many lives are lost on the roads daily. Then I got a idea, I heard that rollercoasters stop with magnets and I thought that we could stop crashes the same way with minimum...

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...

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.

So it has been puzzling me that the repulsion and attraction between two bar magnetics can be considered as a consequence of magnetic field energy density - that is magnetic pressure. I realize 1/2B^2/mu_0 is the pressure and that times the area gives the force. But conceptually I don't...

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.

Homework Statement Consider three Ising spins located at the vertices of a triangular lattice, interacting antiferomagnetically with each other. The energy of an interacting spin pair is minimized when the spins are antiparaller. However, in this case, the energy cannot be minimized, since...

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

1. A bar magnet experiences a torque of magnitude 0.075 Nm when it is perpendicular to a 0.50 T external magnetic field. What is the strength of the bar magnet's on-axis magnetic field at a point 20 cm from the center of the magnet? 2. torque = mu*b*sin(theta), in this case just mu*B...

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...