Maxwell Definition and 505 Threads

Ghislaine Noelle Marion Maxwell ( ghee-LAYN, -⁠LEN; born 25 December 1961) is a British socialite known for her association with financier and convicted sex offender Jeffrey Epstein. She worked for her father, the publishing tycoon Robert Maxwell, until his death in 1991, when she moved to the United States and became a close associate of Epstein. Maxwell founded a non-profit group for the protection of oceans, The TerraMar Project, in 2012. The organisation announced cessation of operations on 12 July 2019, a week after the sex trafficking charges brought by New York federal prosecutors against Epstein became public.In 2020, Maxwell was charged by the US federal government with the crimes of enticement of minors and sex trafficking of underage girls. The US Virgin Islands Department of Justice announced on 10 July 2020 that Maxwell was also under investigation in the Caribbean territory.

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  1. menniandscience

    Retarded and advanced potentials

    "of the two types of solutions which the Maxwell equations yield for the wave equation, the retarded and advanced potentials, only the retarded field seems to have a physical meaning," let's start please with basic (and detailed as possible for the knowledgeable layman! p.s-which equation is...
  2. A

    Ansys Maxwell Simulation - Evaluation of Eddy currents in a Vessel

    Hi, guys, I am developing a simulation in Ansys Maxwell. I set up my simulation in the "transient mode", and I would like to evaluate the eddy currents that arise in a metal Vessel. The currents rise to a flat top in 20 ms and then after 20 ms in the flat top, it decreases to zero in 20 ms. I...
  3. A

    Time dependent current input in Ansys Maxwell 3D

    Hi guys, I am new to this phorum and Ansys Maxwell as well. I am trying to pass as an input a time dependent current, but I really do not know how to do it. Does anyone know how to fix this issue? Cheers, Alessio
  4. JD_PM

    Understanding the Maxwell Stress Tensor

    The elecromagnetic force can be expressed using the Maxwell Stress Tensor as: $$\vec F = \oint_{s} \vec T \cdot d \vec a - \epsilon \mu \frac{\partial }{\partial t} \oint_{V} \vec S d\tau $$ (How can I make the double arrow for the stress tensor ##T##?) In the static case, the second term...
  5. S

    Ansys Maxwell -- How do I add a permanent magnet into my simulation?

    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...
  6. Bill McKay

    Maxwell's calculations on electromagnetism's speed = light speed

    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...
  7. D

    I Maxwell Tensor Identity Explained: Deriving Formula 8.23 in Schawrtz's Book

    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}...
  8. universal2013

    I Exploring Maxwell Equations & Hyperbolic Functions

    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...
  9. M

    Maxwell Stress Tensor: Engineering Question Answered

    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...
  10. O

    Defining a BH loop in Ansys Maxwell?

    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...
  11. J

    Getting very low flux linkage in ANSYS Maxwell

    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?
  12. O

    How to define a hysteresis loop in ANSYS MAXWELL?

    I am trying to simulate an electric motor in ansys maxwell software, but I can't define the whole loop in four quadrants for the material used in the rotor however it is essential to do this since the motor is of hysteresis type and works on the principle of working point moving all around the...
  13. M

    Ansys Maxwell -- how to ground an insulator?

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

    Troubleshooting Motor Simulation Results in Maxwell: Any Suggestions?

    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...
  15. K

    Maxwell Equations without Faraday's Law

    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...
  16. M

    Ansys Maxwell Query: Error "current leak to the air"

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

    Ansys Maxwell Modeling of Switched Reluctance Motors

    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...
  18. Another

    Help with Maxwell stress tensor

    << 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}##...
  19. A

    A The stability of matter: is really Maxwell wrong? (part 2).

    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...
  20. D

    Ansoft Maxwell Problem in Assigning Excitation of Current

    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!
  21. Kairos

    Misinterpretation of the Maxwell velocity distribution?

    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...
  22. S

    Solving Maxwell Relations Homework with Van der Waals Gas

    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}...
  23. Aleoa

    I Maxwell and The distribution of velocities in a gas

    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...
  24. A

    The stability of matter: is Maxwell really wrong?

    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...
  25. Gene Naden

    Geometric Version of Maxwell Equation related to Tensor Dual

    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...
  26. M

    Maxwell equation are derived in which coordinate system

    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...
  27. Aleoa

    Maxwell aphorism about Probability

    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...
  28. B

    Mastering Maxwell Relations in Thermodynamics: Derivation & Problem-Solving Tips

    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}...
  29. Clara Chung

    Question about Maxwell equation in thermal physics

    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...
  30. fluidistic

    How are Maxwell equations satisfied in Raman scattering?

    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...
  31. M

    Camera Lens works as a Polarizer or not?

    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
  32. Alettix

    Magnetic field in the gap of a tapered torus

    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...
  33. M

    Solving 2D FEM Error with Maxwell Version 17

    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...
  34. I

    Leakage Reactance of a three phase power transformer using Ansys Maxwell

    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...
  35. ajbroadbent

    Curved Mesh on Symmetry Boundary in ANSYS Maxwell 3D

    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...
  36. ?

    EM fields of two opposite moving point charges

    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...
  37. Gene Naden

    I Sum Maxwell Lagrangian 1st Term: Use Minus Signs?

    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...
  38. I

    Ansys Maxwell simulation problem

    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...
  39. A

    Maxwell Ampere law capacitor problem

    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...
  40. P

    Ansys Maxwell: Boundary definition

    Hello, I am trying to find a Magnetostatic(3D) solution for my design. My design consist of a coil embedded in Ceramic material developed by LTCC technology. I am below queries: 1. Is it important to define a material"Insulating"? How it will affect the Inductance of the system and the...
  41. S

    "Lump count inconsistency" error message in ANSYS Maxwell

    Hello there Im really stucked with my model in ansys Maxwell. it has an important error saying the following : [error] Separate operation failed due to lump count inconsistancy. Found 1 lumps instead of expected 20 and I don't really know what does it mean! I have searched all over the...
  42. M

    Feeding temperature profile from experimental data into MAXWELL

    Hi All, my aim is to find the thermal conductivity of litz wire and also convection coefficient of litz wire and air. So, I am running experimental analysis (10A current into litz wire) and capturing the temperature of litz wire. So, I have temperature profile versus time for litz wire. Would...
  43. Khang Vu

    Ansys Maxwell Magnetic Transient Help

    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...
  44. PhiowPhi

    ANSYS - Maxwell, current distribution plot?

    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...
  45. G

    Derivation: Maxwell's equation only from the Lorenz gauge

    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...
  46. T

    Maxwell Relation, Gibbs Free Energy, Thermal Expansion Coefficient

    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...
  47. T

    Maxwell Relation, Gibbs Free Energy, Thermal expansion

    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:
  48. Omokhafe

    Co-Simulation of PMSM using ANSYS MAXWELL and Simplorer

    Hello everyone. Am working three-phase PMSM using Ansys Maxwell and Simplorer. I created the design iin2D Maxwell and trying to co-simulate with Simplorer. Simulation completed with execution error. I would be very grateful if anybody can kindly let me know to resolve this issue.
  49. whatphysics

    Ansys Maxwell simulation taking too long

    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)
  50. R

    Ansys Maxwell- Transient torque fluctuating problem

    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...
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