Magnetic Definition and 1000 Threads

Good day all! I have a question that has been in my head bouncing around for a while and I figured the best resource would be here as I can't find anymore related information (Or I am just looking in the incorrect spot). My apologies if this is in the wrong section I wasn't too sure where to...

Homework Statement A magnetic field of 1.4 T [N] is 4.0 m wide. A very long wire crosses the field. a) If the current in the wire is 2.0 A [W], find the magnetic force on the wire. b) What will happen to the force on the wire if i) The wire is rotated slightly in the horizontal plane? ii) The...

Does a ferromagnetic body moving through an external constant magnetic field obtain an induced magnetic moment? If so, can this induced field be detected? Which equation describes it? Thanks!

Hello, I'm current studying magnetostatics and I'm struggling to understand the equation for A. Here is the equation from Griffith in the attachment. My confusion is, if the object is a cylinder and the current density is a function of s, J(s), then how would I write r-r'? Thank you!

When current flows through a copper wire, for example, a magnetic field is produced. What is the polarity of that field? I've seen an example with special relativity and how a positive charge would be deflected. Does that mean the field is negative to a stationary object? Every video I watch...

Homework Statement In the picture at points A and B are two thin parallel wires, where traveling currents are 15 A and 32 A to opposite directions. The distance between wires is 5.3 cm. Point's P distances from A and B are the same. Calculate the magnetic flux density at point P. Homework...

I don't understand something. At the center of N circular loops, the magnetic field is μ_0NI/2a. And that for a solenoid is μ_0nI. Why are they not the same when the number of loops is large and the length for the solenoid is long?

I was wondering what would happen if you have a current carrying wire that makes an angle with the magnetic field and how to describe its motion. Prepare yourself for the bad drawing. I will first show how the method I used works for a simpler case where Magnetic field and current are...

I've been using DC motors with magnetic hall effect encoders on them to measure position control. It's basically a feedback servomotor system. i've so far been feeding the signal into my microcontroller's interrupts. This has been causing some problems with my timers and program. Let's say the...

Homework Statement A long wire with a current changes direction by 90 degrees. Calculate the magnetic field at the point at a perpendicular distance of S from the wire before it changed direction and a distance of T from the segment of the wire after it changed direction. Homework Equations I...

Homework Statement J-coupling term between two spins is HJ = ħJ/4 σz(1) σz(2) In the measured magnetization spectrum of the spins, this leads to the splitting of the individual spin lines by frequency J, which we’ll now derive. We can write the magnetization of spin 1 as: <M1(t)> =...

This is question that can't really get a precise answer without significant modeling or experimentation, but I'm wondering what folks' intuition might be on an answer to the following setup + question: Suppose there is a steel tank made of steel pipe with walls about 0.25 cm thick, internal...

hi, in this problem here there's 2 perpendicular coils but in solution there's an effect of mutual inductance why?

Hi guys, a solenoid coil 10x4 mm needs to be moved along the vertical axis of a strong magnetic field (up to 14 Tesla) generated by a superconducting magnet. The coil must be contained into a classical probe for NMR spectroscopy, and moved vertically inside that probe. The main issue I am facing...

Good day All, I have a confusion in my mind and i hope to clear it If we use the Amper law to calculate the magnetic field outside the cable, the value would be 0 because the electric current inside the amperian loop is equal to 0, but in case we apply the Biot savart law to calculate the...

Homework Statement Currently I am taking a course that teaches half the material and let's you figure out/ guess the other half. I have been pretty good at succeeding in this so far, but this one has me stumped. It is on my practice test. What in the world does this diagram mean?Homework...

Ok so I haven't been on here for a while but I can't seem to find an answer to my question anywhere and really need some help! So I not only am an electronics hobbies but I have fun installing car audio systems as well. The problem I am running into is that I would like to run an alt wire...

Why does current produce a static magnetic field, but a static magnetic field doesn't produce current? Specifically, why is one true, but the inverse not true? I can accept that each rule individually is just how the universe works... but it sounds so contradictory when I examine both together...

Homework Statement Describe the magnetic field you would observe if two coils were connected with magnetic fields pointing in opposite directions. Homework Equations No equation The Attempt at a Solution If the magnetic field was pointing in opposite directions, would it mean that it would...

Good day All! while trying to solve this question I use the right hand rule and according to it the Force should be directed outward (pointing toward me) but here is the answer that puzzeld me I really don't get why it is down , and would feel very grateful if someone can explain me the...

For an undergraduate project, I need a magnet with a magnetic dipole strength of 0.3 A*m^2. However, all distributors I can find only list their magnets in terms of "pull force" which appears to be defined as the force between a magnet and a steel plate. How do I find a magnet with the dipole I...

In given figure of interpoles connection for a DC Machine, why the carbon brushes connected to the commutator are not placed in the Magnetic neutral axis? The given position will induce more sparking. Interpoles solution is from following website...

The equation of motion for a charged particle with mass ##m## and charge ##q## in a static magnetic field is: ##\frac{d}{dt}[m{\dot{\vec{r}}}]=q\ \dot{\vec{r}}\times \vec{B}## From this, we can see that ##\frac{d}{dt}[m\dot{\vec{r}}-q \vec{r}\times \vec{B}]=0## and so the following quantity is...

Hello Before I start, I would like to clarify that I know Perpetual Motion is not possible & Energy can neither be created nor destroyed, But Can be change from one form to another. That's exactly my point. If I could convert energy from one to another, then why couldn't I just harness energy...

Homework Statement Draw this diagram: Now do the following: find the unknown poles labelled with a question mark draw the magnetic field around the conductor shown determine the direction of the force acting on the conductor Homework Equations Using the right-hand rule can help to solve...

Homework Statement I have some attachements below from my textbook. According to it the value of resultant flux is constant in magnitude and 1.5 times the maximum value of flux. But i have a doubt regarding how it is proved. The magnetic flux waveforms are 120° apart from each other and at...

My question is whether voltage is actually a magnetic force that pushes electrons through the electrical circuit. My question arises from the fact that conductor passes through the magnetic field and if the circuit is closed we have the electron movement as some force pushes the electrons it...

Homework Statement Three very long parallel conductors situated in the air make a direct-symmetrical 3-Phase system. The conductors pass through the A B C points of the triangle of side ##a##. The currents in the conductor form a direct-symmetrical 3-Phase system. Effective values of currents...

Hello With a normal magnet, we use energy to position a particle away from the magnet and then the magnet does work and moves it close to the magnet. Is there any way to have such movement being rotational? Ie to uae energy to move a particle or point clockwise and then the magnet will move it...

Is it possible to direct or confine field lines to be shaped like a laser? I know there are magnets such as neodymium cones that direct field lines through the tip but they don't seem to have the amount of pull as I'm looking for. If there isn't, is there anyway to amplify the power? Maybe align...

Hello, I am wondering if one can create a magnetic field which can be seen by a human eye? I have learned that light is nothing else but electromagnetic field with a wavelength between 400-800 nm. Colours correspond to different wavelength within the above spectrum. So isn't it theoretically...

Homework Statement [/B] A conducting coil of radius R is outside a long solenoid with a cross section of radius r. What is the emf induced in the coil? Most example problems of this type I think are solved based on Faraday’s Law. These examples do not use the distance from the solenoid to the...

I have some serious issues trying to understand the idea of the spin in the context of the Stern-Gerlach experiment and would appreciate some assistance! Assuming that a homogenous magnetic field ##B## in the "North-wards" ##z##-direction, assume that there is a magnetic dipole moment ##\mu##...

I attached the image of the problem . I'm sorry if it is unreadable. It essentially says that there is a parallel plate capacitor with a uniform electric charge in the space between the plates. And a uniform magnetic charge is in the space between the plates which is produced by another...

Hi everyone, I am currently working on a project in Physics analyzing the possibility of magnetic fields protecting against radiation particles such as fully ionized nuclei or electrons. I wrote a code in Matlab that simulates a 3-D magnetic field based on a combination of wires and wire loops...

Homework Statement Consider a solid spinning sphere of negative charge in a non-uniform magnetic field: http://d2vlcm61l7u1fs.cloudfront.net/media%2F2f8%2F2f840122-3d7f-4af3-98a7-efa9b2e7d26a%2FphpBOhfaK.png (the rotation illustrated at the top is supposed to be counter-clockwise). What...

Homework Statement Homework Equations Magnetic Field of a Current Loop The Field of a Long Straight Wire The Attempt at a Solution Sorry ! I'm so stupid that i couldn't figure a way to solve this exercise. I don't know how to start with those two equations. Please help me !

So i was just wondering if a satellite's circuitry could be affected by the Earth's own magnetic field inducing a current, if it was moving through it quickly enough (the space station for example), and how it might mess with it? Also considering a satellite is a big hunk of metal, could passing...

Homework Statement x represents the distance between the wire and P. The wire has infinite length. What is the magnetic field created by the wire at P? Homework Equations B=μ0I/2πr The Attempt at a Solution I thought the the first part of the wire creates a field equals to μ0I/2πx (directed...

I was recently having a discussion about magnetic fields outside of a shielded power cable. My understanding up to this point was shielded cables only shields electric fields and not magnetic fields which are associated with current flow inside a cable. For the shielding to shield magnetic...

First let me say THANK YOU to anyone who reads my work and tries to help, I know it can be a pain to decipher the work of others (although I've tried to make it as clear as possible). If any part is unclear I will try to explain it. I cannot for the life of me see any flaws in the argument...

By relativity+coulombs force, I worked out that the (magnitude of the) magnetic field of a charge Q moving at speed V should be (ϒVV/c2)Q/(4πε0r2) or in terms of mu, ϒVμ0VQ/(4πr2) (where the distance r is measured normal to V). When I google the answer I only find the same thing but without the...

I am trying to simulate a linear eddy current brake. To do this, I am modeling my brake as a single magnet moving above an aluminum plate. I plan to measure the drag force on this magnet and calculate my braking force as a superposition of single magnets. Here's my current setup: Model: A...

Homework Statement Determine the expression for the potential created by two magnetic monopoles (one positive, the other negative) that are equidistant from Earth's center (a/2 is the distant from each monopole to the Earth's center) and that are placed in the rotation axis. Homework Equations...

Hi, I've been wondering what causes a magnetic field, current or an electric field. If you had a material with extremely low susceptibility and extremely high permeability then what would cause a magnetic field in this material, a current or an electric field (as long as whatever is causing the...

Can we predict the movement of a magnet in a uniform magnetic field using Maxwell's equations? What if the magnetic field is variable, for example if we have two magnets moving in a reference frame? Thank you for any answers and I wish you a Merry Christmas! :)

We all think that electric current is the electrons flow without mass transfer in conductor, i.e. charged lepton flow. But charged baryons flow can also deemed as "electric" current, e.g. ionic current. My question is that charged baryons flow can induce magnetic field? Same amperes, then same B...

What if you had a charge with a negligible radius and infinitely strong magnetic field or electric charge? Would it form a black hole of infinite mass?

Homework Statement a circular coil of radius 120 mm with 10 turns is placed with its plane parallel to the Earth magnetic field . when a current of 0.45 A flows through the coil , a compass needle placed at the centre of the coil is seen to be deflected by an angle of 45 degree to the plane of...

Homework Statement Find (a) the module and (b) the direction, entering or exiting the page plane, of the magnetic field at point P, knowing that a = 4.7 cm and i = 13 A Homework Equations Biot-Savart law The Attempt at a Solution For 1-2 and 4-5 segments, B = 0 because sin θ = 0 for...