Magnet Definition and 868 Threads

I am a mechanical engineer and am having to do some calculations concerning magnets and solenoids for a project I am on. I have a solenoid (defined by number loops, current and cross sectional area). Inside the solenoid is a rare Earth bar magnet of some length, initial mis alignment...

Homework Statement a magnet that weighs 2.6 grams is dropped through a 1.53 metre tube. the average time taken for it to go through is 1.59 seconds. I need to find the strength of the magnetic field and the currentHomework Equations Fg=mg B=F/IlsinthetaThe Attempt at a Solution...

Homework Statement You move a bar magnet through a coil at a constant speed. Graph the flux through the loop as a function of time. Graph the induced current in the loop as a function of time. Homework Equations The Attempt at a Solution Graph of flux vs time: I'm thinking is...

Homework Statement Why does a magnet move slowly in a copper tube, but doesn't in a nonmetal tube? Homework Equations Electromagnetic induction (Faraday’s principle) is the production of voltage across a conductor situated in a changing magnetic field or a conductor moving through a...

Hi If we have a Y shape iron and we put a Permanent Magnet N pole at the bottom leg of the Y in such that it will saturate it. would the top ends of the Y also be saturated. what if instead of 2 we have 20 branches where flux can go. what is the saturation will be like at one branch? thx

I would I go about determining the magnetic field of a bar magnet experimentally? Any ideas?

Hi All, The classical theory of a bar magnet as I understand it is that there are many current loops at the atomic scale which have magnetic moments all pointing in the same direction. At the interior of the magnet, with one loop next to the other, currents go in opposite directions and...

I am trying to calculate the theoretical induced emf of a hand crank generator I am going to make. The generator will have a rotating magnet inside a coil of wire. The magnet will be fairly strong. Magnetic Pull Force: 146 lbs Magnet Dimentions: 2"x1"x1" rectangular block Is is possible to...

Compressed "non-bonded" magnet - possible? Dear everyone As opposed to a bonded magnet being magnet powder "glued" together with e.g. epoxy and which is incapsulated as to prevent corrosion - does anyone know if one can instead compress magnet powder without a binder directly in a can-like...

Spherical Magnet...! Hello Everyone, There is a Doubt constantly raising in my mind...it may sound stupid but i was wondering if it's possible to produce Perfect SPHERICAL Magnet...if so how one can determine its pole. I mean Where are the north and south pole...?

So, i am considering to do experiment on water and magnet for my research paper. So what i am planning to do is, i will drop a strong magnet on the water from a particular height and i will record down the height of the 'jumping' water due to contact with the magnet upon landing on water. So...

Hi, Why there are no materials where the net angular momentum is not zero? Permanent magnets have a net magnetic moment coming from the sum of electron spins + orbital magnetic moments. Why the net angular moment cancels out? Or in other words: Is there any material that is not rotating...

1. how do they cool the (huge) magnets at CERN to -270 celsius degrees? 2. how a power planet can increse or decresse the electric potential difference (voltage)? tthanksl

Hello, I've been extremely stuck on the following problems and was hoping someone could give me a push in the right direction: Homework Statement 1) Given an infinite slab of permanently magnetized matter of thickness d centered on the xy-plane with uniform magnetization \textbf{M} = (0, M...

Hi, (I posted this on TSR as well, but they're being a bit slow...) Take the following setup: If you move the bar magnet left and right (a few cm) inside the coils, so that the ends do not leave the coil, will it induce a current/emf? I presume it does so, as I have been taught. But I don't...

So I'm making a simulation to help me understand electromagnetics. Basically I have a stationary bar magnet, along with a moving electron. Each frame the electron has a force applied to it via the Lorentz force law, F = q(E+v cross B). Now E = 0, but how do I calculate B? The Biot-Savart...

Homework Statement I have a problem in my upper div. lab which uses a series of magnets to make a magnetic field. I need to explain the field in some way to show what we did mathmatically. The set up can basically be considered as a magnetic dipole with two mono poles due to insulators...

Hi. I'm doing an experiment and I'm kinda stuck. I know that a current produces a magnetic field. In this experiment there is a current carrying wire (copper) and a permanent magnet suspended above it. Deflection is being measured as the current is varied. I know that both magnetic...

Hello Everybody I heard about unlimited and free energy from magnet motors like perendev magnetic motor I believe that it work , Do I think true? I think perendev magnetic motor specification is: good Torque cheap GREEN Energy Easy to build My question is : " Why we don't use Magnet...

Does anyone know how to calculate the total energy of magnet? Thanks!

What would happen if you were two create something like in the photo. Lets just say that the magnets on the right are on the axle that's connected with motor. While the other magnets to right are on an axle. Would the magnets on the motor drive the other one?

If electricity possible to made only by using magnets (Lorence force) then how electricity was maded for creating with electromagnets the permanent magnets? Any history regards this? If magnets was taken from earth, then me bothering question how strong magnetic properties they have? And how...

Please help, if a magnet is displaced from its equilibrium position by a small angle (theta), show that it will oscillate with a period T given by T= 2*pi*sqrt(I/mB) I = moment of inertia of the bar magnet and equals M(L^2 + a^2)/12 B = Earth's horizontal component of magnetic field M is...

I know that accelerated charges give off electromagnetic radiation, but does an accelerated (spinning) magnet give off electromagnetic radiation as well? If so, what is the energy loss from the magnet's kinetic energy?

I've been trying to find the answer to a question i have online but haven't had much luck. Where did Stable or Pertinent magnets get their energy from? I've read plenty of people saying "magnets don't acquire or release energy" but that doesn't make sense to me. Let's use this scenario...

Hi, I am wondering what determines where these are on a magnetic object. For instance, on a sphere, why should there be a north pole and south pole at points rather than others. To make myself clearer, I am not asking why the south and north are opposite each other, but what determines those...

I was puzzling the Levitron today, and was trying to figure out what the magnets involved strength was, on the off chance that I may build a larger one for kicks. However, after some moderate googling, it doesn't seem like figuring out the strength of a magnet is a quick or 'easy' task...

Hi. I want to make an assembly in which when one clicks a switch, it lights an infrared LED for 1/30 of a second. Basically, instead of having a switch and a battery, i use a linear generator as a switch, giving current only when pressed to light LED. Like any linear generators, when one...

What makes a magnet, a magnet? Ok... I know about polarity and all that. I just don't get why certain elements and compounds aren't magnetic. For example, why isn't an apple magnetic? Thats a little extreme but I think you get the point :smile:

Homework Statement From Townsend "Modern Approach to Quantum Mechanics", problem 1.1: "Determine the field gradient of a 50-cm long Stern-Gerlach magnet that would produce a 1 mm separation at the detector between spin-up and spin-down silver atoms that are emitted from an oven at T=1500K...

Just a couple of simple questions. 1-Why does electricity kill? 2-What causes a magnet to be a magnet and certain things magnetic?

I know this may sound strange. Has anyone ever successfully created a working physical model of a magnet that exhibits the same properties ("flux" lines and attraction) without using magnetic materials or electrical influence? Thanks G

Do neodymium magnets polarized like this and with this same shape exist? http://upload.wikimedia.org/wikipedia/commons/d/d8/Bar_magnet.jpg

just wondering if its a sneaky answer or just as simple as put a magnet next to it?

Can you please tell me whether you think this magnet motor will work or not? If not then what is the reason why not. Most magnet motors seem to have a bad press, so I don't hold much hope for this one: http://www.flantoons.co.uk/magnet-motor001.jpg Thank you. Mike UK

Ok I have 2 questions about this. So I know that a current is induced when the magnetic field changes near the wire. So say I dropped the magnet North end up and South end down through this wire, the current would increase as it was nearing it, and decrease as it leaves it. 1) is this...

Greetings, The other day while working on my car I began thinking about solenoids and how they work, but I think I may have confused myself. It's been a while since I've studied magnetism, but I remember that the current through a wire loop, and thus a solenoid as well, is dependent on the...

I am trying to calculate how much forces is between two magnets, but the catch is they will be approaching each other at an angle. I have found plenty of information using the model of two magnets heading end to end, but am not sure if the formulas change when the magnets are not in that...

Hi all, I was wondering if anyone knew, or if anyone knows where I can find, the maximum magnetic field that a micro - electromagnet can put off... I am sure this depends on a lot, but I just need an estimation as I am running a simulation and need a typical value. I ran the simulation with...

I am incorporating a solar chimney in my house build in Thailand, this will have a venturi to create the suction for removing warm air from the building and I intend to use this high air speed area to generate electricity. As air speed will be dependant on the Sun and not the more fickle wind...

What is the drag force on a magnet falling through a coil? I have found several sources online describing the drag force on a magnet falling through a conductive pipe. How might this vary if a coil is used in place of a pipe? Does the coil need to be connected to a circuit to create this force?

1. The problem statement, all given/known data A bar magnet is positioned at the mouth of a solenoid. The current indicated in the solenoid is then turned on. (Assume the solenoid is a lot bigger than the bar magnet.) Gravity and friction can be ignored. Describe what would happen, and...

Homework Statement "A light bulb is connected to a coil of wire. If a magnet is passed back and forth through the coil the bulb will light up. Why?"Homework Equations The Lenz Law isn't really an equation, but it states that: "The magnetic field of the induced current is in a direction to...

Hi, I am trying to design a simple water valve that opens a plug in a small water reservoir until its empty. So far I have a solenoid coil wound around a hollow core plastic pipe with a cylindrical rare Earth magnet inserted halfway into the pipe with a 'plug' attached to the top of the other...

Hi all Can you assist - I think that I am on the right track - but then I could be wrong.. Homework Statement Predict which direction the wire will move Homework Equations Right hand rule The Attempt at a Solution Current flows from positive to negative. Right hand...

Hello. I have problems with the Faraday and Lenz laws. Not problems with their definitions (they are OK), but with the usual assumptions and relation with conservation of energy: The definition of these two laws states: - Faraday law: The induced electromotive force or EMF in any closed...

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...

What happens, and why? (This isn't homework, just curiosity.) To be more precise, what would happen to the magnetic field of the magnet if we passed a current through it (assuming it is conductive). Will the current disrupt the magnetic domains? Will the magnetization disappear?

Let me first explain my situation here... I'm a math major and out of all the sciences, physics is my least favorite, but I have to take this science class that forces you to design your own experiments. Math is used in physics all the time, but I have a really hard time connecting math to...

What is the answer? Should be B Please Explain the reason behind I don't understand how an induced Magnetic Field will cause the coil to move. (Not Homework)[SIZE="2"]Source:tycphysics.org/TIPERs/TIPER%206_20_02_keys%20pdf/EMI%205a_Key_6_02.pdf thanks for helping