Magnetism Definition and 949 Threads

Quick question, that seems pretty obvious, but I wanted to check. Magnetic fields follow the rules of super-position similar to the way electric fields do, correct?

Here's what I don't understand. Start with two charges e1 and e2 on the plane of this screen, that are Y vector apart. e1 is moving at velocity V1 toward the top of the screen. e2, directly to the left, is moving at velocity V2 toward the right...

It would be appreciated if formulas that would directly or indirectly allow the following quantities in question to be calculated are posted in this thread. The questions are listed below: 1.) How strong would a magnetic field have to be to block a given amount of electric power in a given...

When discussing magnetism or magnetic systems, Do you apply an H-field? or apply a B-field? I suppose this is in the general situation where you apply a magnetic field to a material. In relation to B-H loop showing hysteresis, I notice that the "x-axis", typically dependent variable, is...

E & M Magnetism Relativity "Paradox" :confused:In theory the laws of magnetism are derivable from coulomb's law and special relativity. Right. While my physics homework group were doing a problem set, I came up with this seeming paradox. (This isn't a homework question). There are 2 senarios...

I have a bunch of conceptual questions on Earth's magnetism. The problem is I have not understood the elements there. I am not able to visualize the magnetic field ,horizontal component,declination,inclination. I don't know the directions of them too. My book hasn't given pictures of them...

What can reflect,block or neutralize magnetism and magnetic field of a magnet?

how or from where the magnetic force is coming? why some metals are magnetic?

If I cut a magnet exactly where the border of its south and north pole is...does it mean I'm creating a one-sided magnet? Also, are one sided magnets naturally-occurring?

How much E&M is involved in a MechE degree? I'm a high school senior in AP Physics C: E&M and I hate it with a passion. I loved Mechanics, but E&M is terrible. Would I just need to take the one required class (Physics 2), or do I need to use multiple E&M concepts throughout undergrad? I am...

hi, Is it fair to say that magnetism rises from the fact that there are more up than down electrons or they also have to be at the Fermi level? I am a little bit confused about this Fermi level thing. I heard people saying that up/down electrons difference must be at the fermi level. Also...

I apologize, I wrote all of this out in a word processor before attempting to post it and I did not notice that there is a template for giving problems. I hope you forgive me, my posts tend to be wordy and take awhile to write; attempting to write it in the text box would result in the server...

i was wondering if it is possible that there is no such thing as gravity? i find the mysteries of coral castle , giza pyramid and stonehenge and such as astounding i don't know how true the claims are about the ancient people knowing how to do "anti-gravity" but apparently they thought...

1. How is magnetism propagated? The descriptions I have read of magnetism explain about spinning electrons and the effects of magnetic fields, but I can find no explanation how magnetic force is propagated. Gravity is explained via GR and the effects of mass/energy on space-time, but I don't...

Homework Statement The potential caused by an array of charges in a region of space can be described by the equation V(x,y,z)=2x+xy+y2-xz2 volts, where all distances are measured in metres. If a charge of 2 mC is moved from the position r1=(1,2,0)m to r2=(3,1,0), calculate the resulting change...

Anyone know of any good papers, research i can view on magnetism, also any equations for working out the force of one etc would be fantastic.

Does anyone know where I can purchase the hardcover 1985 Electricity and Magnetism? Some schools, such as Caltech and MIT, still use the book; however, Caltech does not have it in their online bookstore and MIT lists an 09 edition (which I assume is an ebook?). Some copies are floating...

Homework Statement 2 parallel long, straight conductors lie on a smooth plane surface. 2 other parallel conductors rest on them at right angles so as to form a square of side 'a' initially. A uniform magnetic field B exists at right angles to the plane containing the conductors. Now they start...

When current (DC) passed through a wire it creates a magnetic field around it, right? But if you placed magnets around that wire would they interact with the electricity flowing through the wire? If so, to what extent?

I'm taking E&M next semester, and the book we use is quite good at explaining concepts, but it only has 9-12 questions per chapter. I would like to do more practice problems. We used the same book for modern mechanics (it is a two-edition set, the first is mech and the second is E&M). Any...

hi ... i want to ask about domain theory of ferromagnetism... first of all , According to classical electromagnetism, two nearby magnetic dipoles will tend to align in opposite directions, so their magnetic fields will oppose one another and cancel out. how does this happen? after this ...

? I'm just curious. Also I'm having trouble with mechanics. I feel like i have no idea how to grasp fnet and calculating it. I also REALLY REALLY REALLY suck at drawing free body diagram. Math is a walk compared to physics which feels like a marathon. I'm actually not that great with math but...

A couple weeks ago, a friend tossed out 'what's the magnetic field of the Earth look like?' It's not the same I learned it was when I was in school. We have great studies to prove it's shape and characteristics. And then I began to wonder what else has been found out about this. I found the...

Is gravitational acceleration, g, at any given spot around the globe imparting sufficient velocity so that the interaction (interchangeable) between a ferromagnetic coil and a magnetic field may generate electricity?

¿How do modern physicists think about magnetism? Recently, I realized something really cool that made me re-evaluate the way I thought about magnetism. I'm not a physicist, I'm in the early process of becoming one (old cow trying out a whole new career). I had this "fieldy" notion about what...

In magnetism does a photon (or stream of) spin around a particle to create magnetic force? Or to ask this another way, are photons force carriers in such a way that since they spin around a particle so fast, their paths have become effectively a barrier, hence the force.

I'm taking gen. physics 2, which consists of electric fields, magnetism, stuff like that. Big difference from classical mechanics in physics 1. I remember in calc III, I learned nothing from my professor because he didn't know how to teach. I basically learned the entire course from Paul's...

What is the difference between static attraction or repelling, compared to magnetic. I understand the princips of static build up and why a charged positive and charged negative attract each other. I also understand how the atoms are arranged in a "metal-magnet". But why can't you attract a...

what would a magnetic field look like in 4+1D? In 3+1D the field lines simply rotate around the axis which points along the direction of motion of the electron. But in 4+1D this is not defined. But if magnetism is simply a result of relativity then there should be a way to make the equations...

Several years ago Tethered experiment demonstrated that current can be produced by a long wire moving in Earh orbit, due to Earth magnetism. Being Earth inside Sun magnetosphere, wouldn't it be possibile to accomplish same task in a long wire properly positioned on Earth surface? Possibly at...

Hi guys, I was answering some questions on my physics homework and I didn't understand why the answer was what it was... the first question was this: 1.) A hollow uncharged metal ball hangs from a silk thread. A glass rod has been charged by rubbing with rayon. When it is brought close to...

Radiomagnetism or radioactive magnetism. Has any research been done on this phenomenon as a source of propulsion. Are we thinking too small? Can the various levels of radioactivity affect magnetic propulsion by increasing its magnitude. What would be required to observe this on a large scale...

Here are a few more questions on Magnetism. 1. I now know that Electricity is discharged when there is a "Potential Difference", but how does this charge come into place, how does it form. This is one of the times I am asking for you to be as specific as you can (remember, I am 13 here...

Some magnetism and Electricity questions. Remember, I am only 13, so don't answer me like your are talking to a Major in Physics, but please answer me with detail, as if you were talking to some one in high school, I want to understand the details of things, not the general idea. Question...

Sorry for the un-informative question, but I am new here and am only 13 years of age. What causes magnetism, and why is it that only certail substances can be Magnetized, and others cannot.

Hello Guys I am a new joinee and this is my first question. I apologise if the question is little trivial. Basically, Think of the following: Scenario: There is a strong bar magnet and some magnetic metal balls lying on the floor of a room. Step 1: I lift the magnet from the floor and...

This article is an abridged version of the original article posted in google groups and is attached to this post. For further proofs or clarifications regarding this article, please download the attached file titled electrodynamics and magnetism.pdf. I am not sure whether this article should...

If I were to build a solenoid for the sake of making an electromagnet with a core shaped like the one below, would it create the desired effect? CRUDE! :-p Cross-sectional view of my idea. What I'm asking is, would the inner edges of that gap (the sides closest to the center) be one...

Homework Statement It is a multiple choice question. The picture shows two bar magnet attracting each other. A charge is placed in the middle of the distance between the two magnets. [S-Magnet-N] >>>> (-C) >>>> [S-Magnet-N] >>> = direction of field lines. (-C) =negative There is no...

Hi guys, I have chosen the variation of magnetic field strength under different temperatures for my high school physics experimental investigation. We had a guassmeter at school, however it has had a few problems, and so I've dicided to use a compass. My question is, how do i use the angle of my...

Has anyone ever come across any research or articles concerning the effects of the initial blast and fallout of an nuclear weapon and its effects on surrounding magnetism? Theories are welcome too, but research is preferred.

if electromagnetism is mediated by photons, what do photons have to do with magnetic fields? more specifically, what is a magnetic field "made" of? surely there aren't photons released by an ordinary household magnet? i have a vague understanding that magnetic attraction has something to do...

Homework Statement a loop of conducting wire approaches a constant magnetic induction into the paper, which is perpendiciular to the plane of the loop. How does the speed at which the loop enters the field compare with the speed at which it approaches the field? Homework Equations...

I dabble in miniature milling/machining with my home CNC setup. I'm building a low temperature engine and have a question. The piston will be a neodymium magnet(s) set in graphite. Rather than using mechanical linkages and a crankshaft I want to use magnets to control the length of throw. By...

I understand that the electromagnetic field and light are tied together, and they all travel through big groups of photons and they all travel at the speed of light. And I get that light travels through empty space. But I am wondering what does electricity and magnetism travel through...

I just need help on how to solve these problems. I am so confused with the directions that i just don't get it... 1) A long straight wire is aligned north-south and carries current in the northerly direction. What is the direction of the magnetic field created directly abvove the wire...

hello, I am not too sure of how charged particle got to do with magnetism. "Magnetism is a force of attraction or replusion that acts at a distance. It is due to a magnetic field, which is caused by moving electrically charged particles or is inherent in magnetic objects such as a magnet."...

Ok I need a bit of help with my Physics 212 homework.I know I am supposed to list my guesses and all available formulas,but my my problem is I don't actually know where to start.I didn't find any example of these in the book so I am just kinda stumped.I suppose my big problem is that I am...

You have two like charges with the same velocity and a displacement between them perpendicular to the velocity. Moving charges produce a magnetic field. The charges should magnetically attract one another. Now consider the reference frame of the charges. There is no motion so no magnetic...

First off, thanks for taking the time to read this. I am not a Physics Major, I am not a scientist. I do try to think a great deal about our existence, and what our future holds as far as discovery, so therefore, I have something to present. It is hypothetical, but please play along with it...