Maxwell Definition and 454 Threads

hi all I am going to do a project in ansys maxwel, actually i need to add a magnet and i know i have to do it with add material. my magnet is NdFeB . i give the material from net, actually i can not valid them because they are different in value. I need to calculate Mu(permeability ) and I nedd...

I'm studying history of electromagnetism. Here is my question regarding Maxwell's classical brilliant work. I understand these constants (for now) And I understand this: And I understand this: But I need to understand how this math below gets us to the speed of light. I don't understand...

Hello, In Schawrtz, Page 116, formula 8.23, he seems to suggest that the square of the Maxwell tensor can be expanded out as follows: $$-\frac{1}{4}F_{\mu \nu}^{2}=\frac{1}{2}A_{\mu}\square A_{\mu}-\frac{1}{2}A_{\mu}\partial_{\mu}\partial_{\nu}A_{\nu}$$ where: $$F_{\mu\nu}=\partial_{\mu}...

I am trying to understand why maxwell equations are correct in any reference frames? While i started to understand of his laws of physics a bit i could not imagine why he uses hyperbolic functions such as coshw instead of spherical ones in position and time relation between moving frames...

Hello! I was talking with a friend today about electrical motors and we started talking about theoretical designs. One question came up which was could the Maxwell Stress Tensor be used to calculate the torque on a rotor of a motor where the airgap is held constant and the magnetic circuit...

Does anyone have an idea how to insert a BH loop like the one I have attached in Ansys Maxwell and not get an error like in the other picture which is also attached? I have seen it multiple times in different texts but can't define one myself without getting this annoying error. Also the...

I'm new to ANSYS Maxwell and I'm trying to follow the inductance calculation example in the user's guide. The results for the inductance are pretty close but the value of flux are very low. What cause this? What should I do?

Can anyone guide me about how to ground an insulator using Ansys Maxwell 2015?

Hello, I'm trying to simulate a 3 phase hysteresis motor with 4 poles, 36 slots, 220 input voltage peak for each phase, 50Hz, specified dimensions and 0.6 N.m output torque in maxwell transient. The magnetic material used is LNG52 which is also known as alnico600, alnico5DG(ACA52) and alcomax...

Maxwell equations are composed of: Gauss's Law Gauss's Law for Magnetism Faraday's Law Ampere's law with Maxwell addition If you take out Faraday's Law.. can other laws re constitute it? Or are they independent? I want to know how the world would behave if there were no Faraday's Law. Note...

how the error "current leak to the air" in the Ansys Maxwell can be removed? although there is no error in the validation process

Hi Everyone i'm new member of Physics Forums, my research field is about Switched Reluctance Motors i have question about Optimetrics in Maxwell! my question is: How can Optimize Design Parameters ( like Outer and inner Diameter of Stator and Rotor or Embrace of them) of a Switched Reluctance...

<< Mentor Note -- OP has been reminded to use the Homework Help Template when posting schoolwork questions >> my think if ## \hat{r} = \sin(θ) \cos( φ) \hat{x} +\sin(θ) \sin( φ) \hat{y} +\cos(θ) \hat{z} ## ## da = R^2 \sin(θ) dθdφ \hat{r} = da_{x} \hat{x} + da_{x} \hat{y} + da_{z} \hat{z}##...

In a previous message I have tried to show that electrical systems exist which do not generate electromagnetic waves with appreciable energy even if such systems have parts in accelerated motion. Now I add a further example by which the meaning of what I tried to say becomes clearer. The problem...

As the picture showed, when I assigned a current excitation on the coil plane( pink one in image), Ansoft Maxwell alert ”current1 can not assigned on the entity of type face". This is incredible as I take the process completely based on the book!

I suddenly have a problem with the famous Maxwell velocity distribution. The maximum of this bell-shaped curve is commonly interpreted as the most probable velocity for a particle (see for instance https://en.wikipedia.org/wiki/Maxwell%E2%80%93Boltzmann_distribution: "The most probable speed...

Homework Statement [/B] I'm stuck on part c of the attached problem: Homework Equations $$C_P - C_V = \left[P + \left( \frac {∂U}{∂V} \right)_T \right]\left( \frac {∂V}{∂T} \right)_P$$ $$P + \left( \frac {∂U}{∂V} \right)_T = T \left( \frac {∂P}{∂T} \right)_V$$ $$\left(P + \frac {a}{V^2}...

In the first volume of his lectures (cap 6-4) Feynman presents Maxwell's distribution of velocities of the molecules in a gas. And, referring to the PDF graph he says: "If we consider the molecules in a typical container (with a volume of, say, one liter), then there are a very large number N...

First of all: excuse me for my not good english written language. I come to the question with an example. Let us suppose two electrons are in space with initial velocity equal to zero. Given the Coulomb force such electrons will be submitted to an equal and opposite accelerations (for the action...

Homework Statement From Misner, Thorne and Wheeler's text Gravitation (MTW), exercise 3.15: Show that, if F is the EM field tensor, then ##\nabla \cdot *F## is a geometric, frame-independent version of the Maxwell equation...

Ignoring special relativity theory，maxwell equation are deduced in which coordinate system?In most electrodynamics textbook,maxwell equation are deduced without specifying which coordinate we are using.For example,when we are solving poisson equation in static case，it seems we can freely choose...

In the first Volume of his lectures (cap. 6 first Paragraph), Feynman cites Maxwell : "The true logic of this world is in the calculus of probabilities". Considering the formal and rigorous definition of probability, very often misunderstood by not-scientists, what do you think is the deep...

I'm studying Thermodynamics and I'm a little stuck at this problem. 1. Homework Statement Starting with the first Maxwell relation, derive the remaining three by using only the relations: $$\left(\frac{\partial x}{\partial y}\right) _{z} \left(\frac{\partial y}{\partial z}\right) _{x}...

Homework Statement Homework EquationsThe Attempt at a Solution How to do part ii)? I differentiate part i with respect to p (∂H/∂P)T = T (∂S/∂P)T + V ...(1) Then I used the equation given in the question, Applying maxwell equation I got (∂T/∂V)S = -(∂P/∂S)V ...(2) I planned to substitute...

I had learned that at the interface between 2 regions such as vacuum and a material, if there's an incident light from a region to another, the boundary conditions on the ##\vec E## and ##\vec B## fields at the interface are such that for them to hold at all times, the frequency of the incident...

I read maxwell says electric field polarizes the dielectrics. Does it mean above effect used at photographic camera lens design to make that lens sometimes works like polarizer filter ? Mustafa Umut Sarac Istanbul

Homework Statement Consider a toroidal electromagnet filled with a magnetic material of large permeability µ. The torus contains a small vacuum gap of length h. Over most of its length the torus has a circular cross section of radius R, but towards the gap the torus is tapered on both of its...

Hi, I am working on Maxwell version 17. I have a simple motor to analysis 2D FEM. However, when I analyze the model, I see this error. "Maxwell2d solver, process solver2d error: Internal Solver Error: 'Transient solver handles only isotropic conductivity!'. (7:07:10 PM Apr 16, 2018)" I am...

Hello all; I am trying to calculate leakage reactance of three phase power transformer . I am using Ansys Maxwell final element solution to analyse it. The software gives me total energy and linkages and self and mutual inductances.By using this quantities how can ı compute leankage reactances...

I figured this would be the best place to ask as there doesn't seem to be a FEM/Simulation specific sub-forum here, but I am looking for some help regarding mesh generation in ANSYS Maxwell. I have an array of "micro-needles" that I am applying a voltage to in order to determine the electric...

I wrote and solved this problem but am having serious doubts about the answer I obtained. Homework Statement Two point charges \pm q move along the z-axis with velocity \pm v. If they are at the origin when t=0, what is the electric field magnitude a distance r from the z-axis? Homework...

So the first term of the Lagrangian is proportional to ##{F_{\mu \nu}}{F^{\mu \nu}}##. I wrote out the matrices for ##{F_{\mu \nu}}## and ##{F^{\mu \nu}}## and multiplied at the terms together and added them up, but some of the terms didn't cancel like they should have. Should I have used minus...

I am using Ansys 18.2 Maxwell 2D to analyze a transformer by using transient and magnetostatic solvers. Normally the analyses were completed correctly and took time like a half an our . But right now the simulations are comleted suddenly(in few seccond) and there is no error no result and no...

Good day All! I have an issue solving this question According to my basic understanding, the displacement current goes from the positive plate to the negative plate, so whether the capacitor is charging or discharging the magnetic field direction should remain the same, but here is the 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...

I was modeling current distribution in a component: And I plotted the ##\vec J## to simulate & understand the current distribution throughout the conductor, all the flows make sense, however, at the edge of the conductor like so: Current would distribute all around the area, which is...

Hi. Here, somebody apparently derives Maxwell's equations using only symmetry of second derivatives and the Lorenz gauge condition. Unfortunately it's in German, but I think the basic ideas are clear from the maths only. In this derivation, the magnetic field turns out to be divergence-free...

Homework Statement By means of a Maxwell relation derived from the Gibbs free energy and making use of the third law of thermodynamics, prove that the thermal expansion coefficient β must be zero at T = 0. I tried but I got something funny. Homework Equations $$G=U-TS+PV$$ $$dG=\mu...

By means of a Maxwell relation derived from the Gibbs free energy and making use of the third law of thermodynamics, prove that the thermal expansion coefficient β must be zero at T = 0. I tried but I got something funny. My working:

simulation doesn't seem to be progressing. always stuck at this stage, see progress bar. any ideas how to solve? thanks! (btw I am trying to simulate it to get results of inductance for the copper coil)

Hii Friends, I was trying to model an Induction motor 5 KW in ANSYS Maxwell. The final output of Transient torque looks like shown below. It fluctuates with average torque almost equal to zero Nm. The input passed is a sine wave current with 120 deg phase shift. Any Suggestion will be highly...

Homework Statement What is the name of the experiment that proved Maxwells distribution of velocities? Homework EquationsThe Attempt at a Solution

Maxwell stress tensor ##\bar{\bar{\mathbf{T}}}## in the static case can be used to determine the total force ##\mathbf{f}## acting on a system of charges contanined in the volume bounded by ##S## $$ \int_{S} \bar{\bar{\mathbf{T}}} \cdot \mathbf n \,\,d S=\mathbf{f}= \frac{d}{dt} \mathbf...

My thoughts are concerning an infinite sheet carrying current in a direction. I wish to induce a unidirectional electric field outside of the sheet via induction. My ideas were that if the current was changed linearly in a sawtooth fashion, then I would achieve the induced electric field in...

Can anyone please explain me some uses of maxwell's on my REAL life? REAL life = weapons, propulsion, tech, radio frequency and microwaves,nuclear physics(maybe); no REAL life = monopoles, origin of the universe, space bull, particle physics( muons,pions etc.); PS. I am 14 years old so don't...

Hi Guys, I'm simulating a SRM in Maxwell 2D transient solution and my wingdings are external but a group of them are not able to show in the maxwell circuit editor. I've got this error: Cannot find the matching inductor in the imported file. Can someone help me with this?

Something about the theory of quantum measurement/collapse in the case of quantum fields... Suppose I have a field, either a scalar, vector or spinor, that I want to describe as a quantum object. For simplicity let's say that it's a scalar field ##\phi (\mathbf{x})##, where the ##\mathbf{x}## is...

So I worked through the Boltzmann distribution and got: $$ P\propto e^{\frac{-E}{k_BT}} $$ Where $E$ is the energy. So surely this means the kinetic energy (and therefore speed) of particles is distributed over a Boltzmann distribution. Or in equation: $$ P\propto e^{\frac{-mv^2}{2k_BT}} $$...

Sometimes as I am reading about the history of physics I run across this phrase. Ponderomotive force. I have tried looking it up several times but can never find an answer that explains what is meant by this phrase. Can someone tell me in laymens terms what is a Ponderomotive Force? Sometimes...

My professor said that the first two maxwell equation's are about static fields Another fast question: Do a single charge that is moVing generate a magnetic field? I saw a demonstration that explains the magnetic field as an electric field using only special relativity, there is a free charge...