What is Maxwell: Definition and 499 Discussions

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. I

    Real Life Uses for Maxwell's Equations

    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...
  2. R

    Maxwell Ansoft and Circuit Editor

    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?
  3. hilbert2

    A Field strength measurement and continuity

    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...
  4. Toby_phys

    Boltzmann vs Maxwell distribution?

    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: $$ P\propto e^{\frac{-mv^2}{2k_BT}} $$...
  5. mpolo

    I Ponderomotive Force - What is it?

    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...
  6. P

    Does the first Maxwell equation work also for moving charges?

    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...
  7. E

    Material definition problem in ANSYS Maxwell

    HI Guys, I am getting an error in Ansys Maxwell that says Maxwell2d solver, process solver2d: Internal Solver Error: 'In the Material: M270-35A_12 , the SLOPE of the End Two Points in this BH curve is 56519.1, which is more than 2 times of Mu0; This may lead to a non-physical solution...
  8. Twigg

    Book Hunt: Statistical Treatment of Macroscopic Maxwell Eqns

    Hello all, Jackson Ch. 6 (3rd edition) tells the reader to look at de Groot for a statistical mechanical derivation of the macroscopic Maxwell equations. I figure he means "Foundations of Electrodynamics" by S. R. de Groot. I requested that book be sent to my school library on loan, but I was...
  9. Bharat

    ANSYS MAXWELL SIMPLORER Solution Error

    Dear all I am doing a simulation of a 3 phase transformer. I am adding the excitation using external circuit in Simplorer , I am getting these error ! Can somebody comment on the error . An external simulator couldn't be setup for simulation. (12:01:33 PM May 02, 2017) Simulation completed...
  10. C

    Solutions of wave equation but not Maxwell equations

    Maxwell equation in absence of charges and currents are $$\nabla \cdot \bf{E} = 0 \\ \nabla\cdot B=0 \\ \nabla \times E=-\frac{\partial B}{\partial t} \\\nabla \times B=\mu \epsilon \frac{\partial E}{\partial t}$$ Wave equation is $$\nabla ^2 \bf{E}=\mu \epsilon \frac{\partial^2...
  11. L

    Maxwell eqs. - integral formulation in dynamics

    The integral formulation of Maxwell equations, for example the one called "Gauss' theorem", see the first equation here: https://en.wikipedia.org/wiki/Maxwell's_equations is still valid in dynamics, with rapidly varying sources? We know that a rapidly varying charge here gives a flux of an...
  12. P

    According to Maxwell, a gamma ray can be as energetic as a radio wave (given equal E amplitudes)?

    According to the old thery of light the energy carried by by a wave is proportional to the amplitude of the electric field not to the frequency as Planck proposed, so an eletromagnetic radiation in the gamma spectrum carry the same energy as a radio one if their amplitude is the same? They only...
  13. JulienB

    Verifying a macroscopic Maxwell equation

    Homework Statement Hi everybody! I have trouble understanding the following problem, hopefully somebody can help! Show that the electrostatic potential ##\phi(\vec{x}) = \phi_\text{free} (\vec{x}) + \phi_\text{ind} (\vec{x}) = \frac{1}{4 \pi \epsilon_0} \bigg( \int d^3 x'\...
  14. M

    Maxwell 3D. error: The solved region is not connected

    Hello all, I am working on a simple induction system consisting of 2 coils (separated by a distance) and the ferrite cores modeled with Maxwell 3D I want to run the optimization tool to define the best distance between the coils in order to have a high coupling factor between them. I am...
  15. P

    Does the first maxwell equation apply only....

    For static electric fields? does it apply also for a generic electric field? Let's say, moving charges inside a closed surface? If there are charges accelerating in a closed surface a part of the electric field is due to the charges, and a a part is due to the fact that the charges acceleration...
  16. F

    I D'Alembert equation and Galilean transformation

    The D'Alembert equation for the mechanical waves was written in 1750. It is not invariant under a Galilean transformation. Why nobody was shocked about this at the time? Why we had to wait more than a hundred years (Maxwell's equations) to discover that Galilean transformations are wrong...
  17. J

    Plasma Book with Maxwell equations in a plasma?

    My main goal is to understand plasmons, for that I have been told that the theoretical background is Maxwell equations in a plasma. Do you know any book with these equations? Thanks!
  18. E

    Ansys Maxwell problem -- band around coil is a difficult geometry?

    Hey Guys, through the past years you helped me a lot. But now i have to ask my first question. I am simulating a solenoid, a very easy one, with a core and a coil. And a translational band (2mm). The only problem is, that i cannot put the band correctly because my solenoid is in a housing, the...
  19. stephen8686

    How did Maxwell find the speed of light

    According to this video I was watching Maxwell was looking for the speed of EM waves and just divided coulomb's constant by the magnetic constant and then took the square root and that was the speed of light. √(Ke/μ0)=√(9e9/1e-7) = 3e8m/s So why is this a thing? I just don't understand why it...
  20. nafuturo

    How Do You Solve These Electromagnetism Problems?

    https://postimg.org/image/lg27z8ngn/ 1. Homework Statement in the first one. I need to find the electrical force in the second one. Lorentz force which exerts the wire on the other element third. Magnetization (M) for Nickel quarter. Electromotive force induced on the dipstick Translate...
  21. Mayan Fung

    Problems related to Maxwell relations

    Homework Statement Given the entropy of a system : $$ S = AU^αV^βN^{1-α-β} $$ The problem requires me to write $$ (\frac{∂T}{∂U})_{V,N} > 0, 　(\frac{∂P}{∂V})_{U,N} < 0, (\frac{∂μ}{∂N})_{U,V} > 0$$ to find the mathematical constraint of α and β Homework Equations dU = TdS - PdV + μdN The...
  22. G

    Ansoft Maxwell: Rectangular Wave Circuit

    Hello, is there a way to directly use a rectangular wave as input current without using an external circuit in ansoft maxwell? The instructions from ansoft that model a toyota motor just put the sine wave function directly into the winding's current settings, can I put a rectangular wave instead...
  23. E

    A Maxwell field commutation relations

    Maxwell field commutation relations I'm looking at Aitchison and Hey's QFT book. I see in Chapter 7, (pp. 191-192), they write down the canonical momentum for the Maxwell field A^\mu(x): \pi^0=\partial_\mu A^\mu \\ \pi^i=-\dot{A}^i+\partial^i A^0 and then write down the commutation...
  24. G

    Ansoft Maxwell virtual vs Lorentz force

    Hello people, I am trying to model a motor in maxwell that has an array of magnets in it , the thing is that I get the non zero forces for the magnets even when there are no excitations if I choose virtual forces , I am selecting the whole array of magnets so the computation should be for the...
  25. D

    Chemical thermodynamics, entropy, Maxwell relation and Z

    Homework Statement A gas obeys the equation of statez=1/(1-b(molar density)) What is the molar entropy change of expanding this gas from a volume of 1 dm3 to 2 dm3 at a temperature of 300 K, given b = 0.2 dm3? Calculate your answer to three significant figures and select one answer from the...
  26. G

    I Differential form of Gauss' law: All three terms the same value?

    Hi. Is the Maxwell equation $$\nabla\cdot\vec{E}=\frac{\rho}{\varepsilon_0}$$ even true in the stronger form $$\frac{\partial E_i}{\partial x_i}=\frac{\rho}{3\cdot\varepsilon_0}\enspace ?$$ I guess not, since I haven't found a source suggesting this. But shouldn't the isotropic electric field...
  27. K

    Calculating velocity using maxwell distribution

    Homework Statement Consider helium as ideal gas with a Maxwell distribution of speeds. (a) Investigate the maximal value Fmax at the peak of the Maxwell distribution F(v): Calculate this value for He at T = 300 K and at 600 K, and for N2 at 300 K b) For He at 300 K, obtain speeds v1...
  28. T

    No slip condition in an ideal fluid- Perpendicular pressure

    The no slip condition has been described as the adhesion of a fluid to a solid surface setting the relative fluid velocity to zero - cohesion (viscous stress) between fluid elements spreads evenly the velocity gradient through the boundary to the free stream. This also infers that the pressure...
  29. D

    Determine the direction of magnetic field from Maxwell eqs?

    Hi! My high school physics tells me using right hand grip rule to determine the direction of magnetic field induced by a current carrying wire, but I wonder whether I can deduce the direction merely from Maxwell's Equations? Suppose now we have a current density in cylindrical...
  30. F

    Maxwell's equation has well defined divergence?

    Homework Statement How to I explain that maxwell's equation has well defined divergence Homework Equations All four EM Maxwell's equation The Attempt at a Solution I discussed it by showing one of the property of Maxwell's equation that is the Divergence of a Gradient is always zero (With...
  31. G

    Maxwell and the speed of light

    Einstein said that the speed of light is constant for all observers. When Maxwell derived that the speed of light in the ether was 299,792,458 m/s could he or did he surmise that the speed of light is constant for all observers (regardless of the motion of the source)?
  32. P

    Liénard–Wiechert potentials: Local or Material derivatives?

    If I took a charged particle and accelerated it, that acceleration would have an effect on charges potentials, allowing for the radiation of electromagnetic waves. This acceleration would be local to a point in spacetime and the observed potentials would depend on the frame of reference of the...
  33. P

    Constant Charge/Current Densities with Accelerating Charges

    In classical physics, when electric charges accelerate, they are expected to radiate. Electromagnetic waves, are by their nature the result of changing electric and magnetic fields. But is it possible to have acceleration of charges without having changing electric and magnetic fields? One...
  34. B

    Calculate the inductance of thick solenoid by ansys maxwell

    hello, how we calculate the inductance of thick solenoid by ansys maxwell ..!:wideeyed:
  35. S

    Maxwell equations from tensor notation to component notation

    Homework Statement Verify that ##\partial_{\mu}F_{\nu\lambda}+\partial_{\nu}F_{\lambda\mu}+\partial_{\lambda}F_{\mu\nu}## is equivalent to ##\partial_{[\mu}F_{\nu\lambda]}=0##, and that they are both equivalent to ##\tilde{\epsilon}^{ijk}\partial_{j}E_{k}+\partial_{0}B^{i}=0## and...
  36. GauravU

    Open circuit test of 3 phase transformer in Ansys Maxwell

    Hi all, I am designing a three phase 11000/433 Volts Delta/Star 50 Hertz transformer in Ansys Maxwell. It has 792 turns in 6 layers on HV side (132 turns per layer) and 18 turns in 2 layers (9 turns per layer). The resistance as I have calculated is 0.1325 ohms per phase of HV winding and 5.57...
  37. EnigmaticField

    A The Fierz-Pauli action takes the form of the Maxwell action

    I read in a paper arXiv:1002.3877 a Higgs mechanism for massive gravity can be constructed by introducing 4 scalar fields (they play the role of the Higgs fields) \phi^A with A=0,1,2,3 and then considering the Fierz-Pauli action S_{\rm{FP}}=\frac{m^2}{2}\int...
  38. M

    Ansys Maxwell mechanical rotation problem

    Hie all. I want to implement an electromechanical system in maxwell. According to its sample projects,in order to define rotational movement, I should define a "Band" object that encloses all rotating parts. The problem is that in my problem the Band object can't be a non-hollow cylinder. I mean...
  39. olgerm

    Maxwell equations in terms of potentials

    These are Maxwell´s equations in potential formulation: ∇2φ = DIV(grad(φ)) . Am I right? ∇2A = ROT(ROT(A))=ROT(B)=grad(DIV(A))-Laplace(A) . Am I right? In coulomb gauge in every point and at any time DIV(A)=[PLAIN]https://upload.wikimedia.org/math/4/4/1/44131cc26bd9db464d0edb7459ccca84.png...
  40. S

    Lorentz invariance of Klein-Gordon eqn & Maxwell Lagrangian

    Homework Statement 1. Show directly that if ##\varphi(x)## satisfies the Klein-Gordon equation, then ##\varphi(\Lambda^{-1}x)## also satisfies this equation for any Lorentz transformation ##\Lambda##. 2. Show that ##\mathcal{L}_{Maxwell}=-\frac{1}{4}F_{\mu\nu}F^{\mu\nu}## is invariant under...
  41. C

    Maxwell's Electrodynamics: The Unusual and Incomplete Theory by Duhem (1902)

    "Maxwell's electrodynamics proceeds in the same unusual way already analyzed in studying his electrostatics. Under the influence of hypotheses which remain vague and undefined in his mind, Maxwell sketches a theory which he never completes, he does not even bother to remove contradictions from...
  42. T

    Integration of Maxwell speed distribution function

    Homework Statement Show the steps needed to obtain the equation for average molecular speed, cavg=√8RT/πM from the integral (from negative infinity to infinity) ∫v*f(v)dv where f(v) is the Maxwell distribution of speeds function f(v)=4π*(M/2πRT)1.5v2e-Mv2/2RT M is the molar mass of the...
  43. Teameister

    Work done moving charge near a line of charge

    Homework Statement How much work (in J) is required to bring a charge of 2 microC from the point {2*6.8,-7,2*1.1}cm via the point {10,20,1}cm to the point {-3*6.8,3.4,-3*1.1}cm, in a medium with relative permittivity of 3.7, near a line charge along x=6.8 cm, z=1.1 cm, with charge density +329...
  44. J

    Algebra Looking for a book on Quaternions

    Hello everyone, Lately, I have been reading and studying the Maxwell's https://es.wikipedia.org/w/index.php?title=A_Treatise_on_Electricity_and_Magnetism&action=edit&redlink=1 https://es.wikipedia.org/w/index.php?title=A_Treatise_on_Electricity_and_Magnetism&action=edit&redlink=1 Thanks for...
  45. Devraj Dutt

    ANSYS Maxwell Optimetrics Error Handling

    A common problem with optimization of machines is that occasionally, some of the variable combinations will not be geometrically feasible. For example, if magnet angle is being parameterized in an IPMSM, it might be that at some point, the magnet skews so much that it juts out of the rotor...
  46. C

    Get core loss in Maxwell 3D eddy current solution type

    Hi. I use maxwell 3D eddy current solution type. i want to find out core loss. please help me.
  47. P

    Fermat's principle can be derived from Maxwell equations?

    As we know, the Fermat's principle states: Light takes the path of least time. I wonder whether Fermat's principle can be derived from Maxwell equations. If it can, then Fermat's principle is included in Maxwell equations, or Fermat's principle is not an independent postulate.
  48. J

    When can I use Helmholtz equation for electromagnetics

    The complete Maxwell wave equation for electromagnetic field using the double curl operator "∇×∇×". Only when the transverse condition is hold, this operator can equal to the Laplace operator and form the helmholtz. My question is what's the condition can we use the helmoltz equation instead of...
  49. A

    Troubleshooting Fault Current Limiter Simulation in Ansoft Maxwell 14

    Hi, I'm trying to simulate a fault current limiter at ansoft maxwell 14 and i have a problem when i put the stranded option on winding, the current that appears is always positive, with the axis above zero. Anyone can answer me what's happening and how can i fix this? Some date: Transient...
  50. A

    Gibbs Free Energy, Maxwell Relations

    Homework Statement We have a Gibbs Free Energy function G=G(P, T, N1, N2) I am not writing the whole function because I just want a push in the right direction. Find expressions for the entropy, volume, internal energy, enthalpy and chemical potential. Homework Equations Maxwell Relations...
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