Magnet Definition and 868 Threads

I was wondering what it would be like if you had a permanent magnet inside the core of a material capable of obtaining the superconducting state. And you cooled it down so that it becomes a superconductor. Assuming it didn't explode; would it just condense the magnetic field into some...

I don't have a physics background but a debunking to this irrational thought process of mine would be much appreciated. I understand perpetual motion/energy is an old, dried, and silly topic, but I can't make sense of this, so thank you in advance for answering (and yes, it's to do with...

Hello all, I am interface designer that occasionally steps out and does some product/concept design. The last one I am working on is something that would require me to make a matrix of little electro magnets, and i am just starting to inform my self about all that. I loved electrical...

Dear Experts I have a 1.5 cm ring magnet, you know, the black color type of common low magnetic power magnet. I wrapped 5 turns of copper wire around it on one side and then wrapped 10 rounds of another copper wire around it . I connected 5v battery to the 2 ends of the primary coil which...

Hi, I'd like to use a millivoltmeter to research voltages induced from a basic ceramic magnet brushing by a conductor. So, I need to buy a millivolt meter. What voltage ranges will be required, and what read-rate should the millivolt meter have (in order for it to register the voltage in a...

I'd like to simulate the interaction between these magnetic balls on my computer. I suppose they are magnetic dipoles, how would I go about finding out the forces applying between 2 of them in a specific configuration ? Do I need to find the magnetic field and then apply the Lorentz force...

Dear all - I am new here so please be gentle :smile: I have searched the site for a few days but alas still have a few questions on something i am hoping to make...so with your kind help - here we go! I am looking to make a type of electromagnetic piston, basically i want to have an...

Homework Statement A soft iron ball is fixed a distance d above the pole of a rectangular dipole magnet which is permanently magnetized. What is the force the iron ball feels due to the magnetic field? The dimensions of the dipole magnet are a x a x b, where a < b Homework Equations...

NOTE : My Current question and source of debate is in post number 10. Lets say I have a square coil. I accelerate it in a direction such that it is perpendicular to a magnetic field directed into the page. As it enters the field and before it is completely in the field an...

Faraday's Law of Induction: EMF=-\frac{\partial \Phi}{\partial t} If two identical coil with same turns of wire and same dimension ( same cross section area in the middle), one has only air and the other has a magnet core. If the two placed in an uniform varying magnetic field, is there...

Homework Statement What is the force acting on a magnetic dipole that falls through a loop of wire? Any sort of answer, exact, approximate or a reference to a source that covers this would be excellent. I haven't been able to find much of anything on this problem. Homework Equations The...

Is it possible to estimate the magnetic field strength of a permanent magnet from the heaviest weight that the magnet can lift? The heaviest weight that can be lifted can be found by trial and error. Any comments or suggestions appreciated. inkpot

I apologize in advance if some of my answers don't quite make sense. I'm generally articulate, but not when it comes to physics I'm barely grasping. I did a lab and part of it was dropping a magnet through a coil, which produced a Voltage vs Time graph using LabPro. For trial 1 we had the N...

I'm currently playing with diamagnetic pyrolytic graphite and I have created a small portion of a track similar to this video I want to create a circular track for it travel on, but as rare Earth magnets are getting expensive I'm going to use thinner magnets that consequently have a weaker...

It's a very important question in science. Are we alone in the universe? This is a question that should be handled like every other fundamental question, yet most people treat it like a novelty. If proof ever does surface it will be clouded by the enormous amount of hoaxes. When looking up...

Homework Statement The figure shows a wire that is connected to a power supply and suspended between the poles of a magnet. When the switch is closed, the wire deflects in the direction shown. Which of the dashed boxes A–D represents the position of the north magnetic pole? Homework...

For a rod magnet, how is the field inside the rod change if another piece of ferro magnetic material is being brought close to one end of the rod? Does the presence of ferro magnetic material increase the field strength inside the rod magnet?

Homework Statement A very strong magnet is suspended by a non-magnetic thread. A student forms a loop out of a wire attached to the Pasco 750 Interface as shown on the left. During a half second interval, the student moves the wire loop until it is below the magnet as show a) Describe...

Basically I was wondering if I was to place a magnet inside a tube sealed at both ends via two magnets (as the diagram shows) would the magnet keep on moving up and down or would it find a resting place. I think it would find a resting place but then I also thought there will also be gravity...

My question pertains to model trains. I use a magnet under my last car to activate computer commands via a reed switch. One locomotive has a speaker placed near the bottom and the magnet of the speaker activates the reed switch - which I don't want it to do. One thought to correct this is to...

What happens when you try to create a ring shaped magnet with a circular magnetisation. e.g. you take an unmagnetised steel ring, wind some copper wire around it, turn on the current for a few seconds and then remove the wire. Afterwards there should be a circular magnetic field inside the ring...

when you place a magnet into a solenoid with a ac current it will get demagnetised. So does this mean that the magnetic field will go into the magnet in the opposite direction of the magnet's own magnetic field? and disalign it. meaning will the magnetic field enter the magnet as though it is...

If I place a super magnet under the bottom of my water bottle, will it magnetize the water I drink everyday? Does anyone have any suggestions? Thanks in advance for any suggestions "After magnetization, the molecules line up in sequence “+-+-“ resulting in reduced surface tension, reduced...

When a current carrying wire is placed into a magnetic field there will be a force. Using Fleming's Left Hand rule. They also said that by increasing the number of turns of the coil will increase the force. But how does this increase the force? Also, by placing a soft iron rod inside the...

Homework Statement If I drop a magnet through a long tube of copper how would the EMF vary with time? Homework Equations The Attempt at a Solution When the magnet enters the copper tube some of the magnetic flux lines are being cut hence an EMF is induced in the copper coil If we...

A well known physics experiment is dropping a magnet through a vertical aluminum tube. The magnet slows noticably before passing completely through the tube. Electrical current is created in the aluminum tube thereby creating a magnet thereby creating an opposing magnetic flux to slow down the...

Homework Statement As the title states. Homework Equations B = μH outside B = -μH inside The Attempt at a Solution Derp.

Homework Statement A bar magnet is dropped through a horizontal coil as shown below. An EMF is induced in the coil with the resultant voltage shown on the graph. Explain the shape of the graph, in particular the differences in the regions marked as A, B and C. Homework Equations...

Hi, I am a high school student and I'm planning on entering a regional science fair with an experiment involving electrolytes, magnets, and electric currents. However, I don't understand electromagnetism well enough to fully understand everything that would be going on in the experiment, and as...

I have just received some ferrite grade Y30H-IA un-magnetized permanent magnets. I am looking to wind some copper around a section of pipe and place the ferrite inside in order to magnetize it. From what i have read the magnets should be anisotropic and to saturate the ferrite I will need only...

Apparently, that's how a lot of car speedometers work... but I don't understand how a rotating magnet inside a coil (or any conductive material, really) can induce a current in the coil. I can understand how pushing a magnet in and out through a coil can induce current, because Flux = Area...

Can magnet fields deflect displacement currents? Could displacement currents be made to propagate in spirals like those in a cyclotron? Do they travel close to the speed of light? Can they be focused into beams? Can they transmit electrical energy at a distance? Are they subject to the same...

Hello 8 months ago we discharged a 3 Tesla superconducting magnet which is part of old FT-ICR mass spectrometer. Magnet was charged some 20 years ago and working since (which is exceptionally long since it worked in persistive mode, which means no charging in all this time). During...

As we know magnet can attract iron, but not aluminium, does anyone have any suggestions what make aluminium behave differently in term of molecule structures? such as Electrons, Photons Neutrons ... Thanks in advance of any suggestions

I was wondering if there was a way of having a magnet near an audio cable without having any interferance maybe by using a sheild. My idea was to have a magnet to replace the 3.5mm audio jack in a headphone cable and port so that it would magnetically attach. Is this possible?

I'm trying to approximate forces on a system. One of my Forces is a 6x8x1" Ceramic Grade 8 magnet on an ferromagnetic object, but they are separated by a small space (about 3/16"). I know the Pull of the magnet, but is there a way to calculate the pull of the magnet relative to the...

How can every substance be converted into a magnet (at room temperature)?

I have a situation that a magnet is placed near to a coil. Especially in pumps and the pump is working based on the stroke mechanisam. The coil is powerd up by a DC source of 12volts and the piston(which having magnet on it) is attracted by this coil called as stroke. The distance between the...

can someone help with this calculation two semicircle magnets N-S of strength 'B' encircle a solenoid of length 'L' and move with a constant velocity 'V'. what will be the current 'I' that is induced in solenoid. also, what force will the magnet experience because of this current (Lenz's law)

IYPT Question--Coin and Magnet I don't really need an answer. I just need someone to guide me or tell me what I need to study on. Or if you have any ideas on this question, feel free to express them. Place a coin vertically on a magnet. Incline the coin relative to the magnet and then...

Hi Sorry I'm not good in physics at all. I have the following dust problem becoming attached to Nickel coatings. from what i know Nickel can become magnetic but aluminium should not be attracted to magnets. I did an experiment to confirm if the nickel coat is acting as magnet in...

I've recently attempted to calculate the force of repulsion between two neodymium magnets. The problems arise fairly early when I don't know how. I know about ampere's force law and all that, but I couldn't find an equation concerning permanent magnets. Obviously, two magnets with rectangular...

hi, I was wondering if there is an equation out there that let's you calculate the force between two neodymium magnet. thanks, i would really appreciate an answer.

I'm trying to learn the basics of designing superconducting magnets for guiding particles, but I'm having a hard time knowing where to start. I don't have a background in this field (besides EM classes). Right now I'm thinking about ordering "Superconducting Magnets" by Wilson and studying...

I am trying to understand the magnet and conductor problem that Einstein mentions at the beginning of one of his 1905 papers. In the frame of reference of the conductor, the magnet moves. Why does this mean that Faraday's law is applicable and not Lorentz force law? In the frame of...

Homework Statement A person throws out the back of a car a strong magnet that is attracted to the metal of the car. Will the magnet return and stick to the back of the car or fall to the ground? The initial velocity of the magnet is v=sqrt(5)i m/s. Treat the magnet/car interaction as an...

If a magnetised neodymium ball has a definite north and south point, could you slice the ball in two, and weld 2 "north" halves together, to create an entirely north ball? If this is impossible, how about designing a ball made in, say, a 3D printer, then embed it with small magnetised neodymium...

Hello everyone, as you may notice I am new to this forum. Unfortunately I've been stuck on a small problem for a few days and I can't seem to find the solution. It appears to be a simple problem so I am hoping that someone here, with a bit more electrical engineering background as myself...

If you had a lined retangular section solenoid inclined at a angle of 45 deg and you rolled a rod magnet ( just fits inside the retagular section) down it. Would the current induced in the solenoid brake or accelerate the rod magnet.

alright so i think I've got a pretty good handle on this, I am looking for a proof read though. any acurate input is greatly appreciated :D Field intensity in teslas = (amps x turns)/coil area; ignoring coil length effects meaning B=μ0(Ni)/m^2 right? but my question is: don't i have...