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. M

    Maxwell boltzmann distribution

    The question is in the image file. I am stuck, I don't know how to start. Can someone guide me please?
  2. J

    Designing microgenerator with Ansoft Maxwell

    I am designing an energy harvester consisting of a magnetic spring. The figure is given in the attachment. I have done the magnetostatic analysis (using Ansoft Maxwell 2D). But, now I am facing problem with - Force vs displacement curve of the moving magnet To calculate the output power...
  3. S

    Learn How to Create a Linear Motor Project in Maxwell 3D - Beginner's Guide

    hi. I am new at maxwell. i have work on some examples but i want to learn how can i do a linear motor project. i didnt find any examples ( pdfs ). where can i find some pdfs?
  4. D

    Maxwell stress tensor in different coordinate system

    Hi guys, I would like to know if the answer given to this thread is correct https://www.physicsforums.com/showthread.php?t=457405 I got the same doubt, is the expression for the tensor given in cartesian coordinates or is it general to any orthogonal coordinate system? Thanks in advance
  5. S

    Maxwell 3D Fatal Error: Solve Your Issue Now

    hi. I am new at maxwell 2D and 3D. i found some pdfs and examples. I am working on the rotational actuator example which in that pdf 1. and i got an error: Fatal internal error (2:14:49 Eyl 09, 2013) Simulation completed with execution error on server: Local Machine. (2:14:49 Eyl 09, 2013)...
  6. D

    Physical intepretation of derivative in Maxwell equation?

    I'm having a little difficulty understanding the use of derivatives in Maxwell's equations. Eg. \oint E . dl = - \frac{d\varphi_{B}}{dt} this says that a changing magnetic flux in time, produces a potential difference (and electric field) in space? I noticed that its a full derivative, and its...
  7. S

    Ansys Maxwell Inductance Problem

    Hi All, If anyone could help me with a problem I'm having, it would be great. I've been using Ansys Maxwell for about 6 months now, and I've gotten the hang of it. I mainly simulate 2 phase inductors. Until yesterday, I've had no problem, but for some reason, I'm not getting any...
  8. W

    Momentum of light sans Maxwell

    I have an easy question but nonetheless I have not been able to find the answer: within the context of special relativity, in particular with light clocks, where the two opposite mirrors of a hypothetical light clock are traveling along very fast, they nonetheless do not leave the emitted...
  9. M

    Maxwell - Boltzman distribution

    I made a spreadsheet to plot the 3d speed distribution from the MB probability function. It matches the peak and fall-off of published graphs. I then tried to integrate it by summing over interval widths times probability. I thought the area should be 1. My result is around 5 or 6. I've tried...
  10. P

    Maxwell Equations Lorentz Invariance - Notation

    [This is mostly about notation] I was working on a problem where I had to prove that div(B) remains invariant under lorentz transformations. That was not too hard, so I came up with div(B) = \partial_{\mu} B^{\mu} must equal div(B) = \partial'_{\mu} B'^{\mu} so I did a...
  11. J

    Maxwell 3D - DC analysis on Human Body

    Hi, I am using a Human body model which I built for some simulation studies. I was trying to pass DC current through the Human body and though my Project completed the simulation successfully I got the below warning message. Can anyone please help me interpret it? The error log is as...
  12. R

    Maxwell velocity distribution

    Dear I have problem with determine the minimum speed in this problem , I think the the maximum speed equal to the average speed and the most probable speed can be obtain by derive equation and equally to zero .Is my solution correct? The speed distribution function for N particles in a...
  13. I

    Why was maxwell given the credit to gauss's integral (flux) equation?

    why was maxwell given the credit to gauss's integral (flux) equation?
  14. Astronuc

    How Does Dr. Ian Chapman's Research Impact Nuclear Fusion Technology?

    "Dr Ian Chapman has been named one of the UK’s top young physicists by the Institute of Physics, winning the 2013 Maxwell Medal, given to those who excel early in their career. The scientist from Abingdon has joined the likes of Stephen Hawking in being awarded a national prize for his...
  15. J

    Static, spherically symmetric Maxwell tensor

    Homework Statement Show that a static, spherically symmetric Maxwell tensor has a vanishing magnetic field. Homework Equations Consider a static, spherically-symmetric metric g_{ab}. There are four Killing vector fields: a timelike \xi^{a} satisfying \xi_{[a}\nabla_{b}\xi_{c]} = 0 and...
  16. L

    Thermodynamics Maxwell relation

    When can be used (\frac{\partial S}{\partial V})=\frac{P}{T}?
  17. A

    Tutorials for coil design in Maxwell 3D

    Hello people, I am interested in tutorials about coil design for Maxwell 3D. If anyone have good material or knows where to find it, let me know. Regards,
  18. Z

    Simple Maxwell Equation question

    Homework Statement In the Maxwell eqn divD = ρ (sub f) What does ρ sub f represent? Homework Equations The Attempt at a Solution Does is represent volume density of charge?
  19. I

    How Does Maxwell-Boltzmann Distribution Calculate Excited Mercury Atoms?

    Homework Statement You will recall from our discussion of the Franck-Hertz experiment that the energy difference between the first excited state of mercury and the ground state is 4.86 eV. If a sample of mercury vaporized in a flame contains 1.02×10^20 atoms in thermal equilibrium at 1613 K...
  20. D

    Using Maxwell Boltzmann distribution to find number of atoms

    Homework Statement You will recall from our discussion of the Franck-Hertz experiment that the energy difference between the first excited state of mercury and the ground state is 4.86 eV. If a sample of mercury vaporized in a flame contains 1.06×1020 atoms in thermal equilibrium at 1563 K...
  21. J

    How to include a capacitor to an Ansoft Maxwell 3D eddy current design

    Hi experts, I wonder anyone of you have an idea on whether we can include a discrete component (specifically a capacitor) into an "Ansoft Maxwell 3D" eddy current design. Little more description: I do have a specific eddy current design with a coils. I need to add a series capacitor and...
  22. O

    Archived Some question about the Maxwell needle method experiment.

    Homework Statement 1)How do we obtain the formula of torsional rigidity ,c=∏nr^4/(2L) ?From experiment? then how do the ∏ come from? How do they know the n here is the rigidity modulus? Why it is not the young's modulus? 2)Is Maxwell needle method same as the torsional pendulum? Both can be...
  23. O

    Math in Maxwell needle method- the formula the moment of inertia

    [b]1. Homework Statement [ How do I get I1( the moment of inertia of the picture b) ?is just a math problem but really no idea. Homework Equations I=mr^2 The Attempt at a Solution maybe centre of mass . Guide will do . please help , thank
  24. P

    Maxwell Stress Tensor in the absence of a magnetic field

    I'm having some trouble calculating the stress tensor in the case of a static electric field without a magnetic field. Following the derivation on Wikipedia, 1. Start with Lorentz force: \mathbf{F} = q(\mathbf{E} + \mathbf{v}\times\mathbf{B}) 2. Get force density \mathbf{f} =...
  25. tsuwal

    Coulomb law dedution from Maxwell equations

    I'm starting my study in eletromagnetism and I would like to know how do you deduce the eletric field produced by a single particle of charge q placed in the origin. The magnetic field is constant so by Maxwell equations, the rotacional is 0 and the divergence is constant. Is this enough to...
  26. S

    Help needed in simulating 3-phase transformer in ANSOFT MAXWELL 2D

    I am designing a 2D model of a three-phase core-type transformer in ANSOFT MAXWELL 14.0. While doing so I have encountered a strange problem. Start of the problem:- While designing the transformer, I wanted to incorporate core losses. So, I did the following steps:- Excitations -> Set...
  27. S

    Probability distribution using the Maxwell Boltzmann formula

    According the the kinetic theory of gases, molecules moving along the x direction are given by Σx= (1/2) mv^2, where m = mass and vx is the velocity in the x direction The distribution of particles over velocities is given by the Boltzmann law p(x)=e^[(-mv^2)/ekT] where velocities range from...
  28. S

    Need help with Maxwell magnetic simulation

    Hello, I am a student from Germany and I stared my first project using ANSOFT Maxwell. I have read several tutorials and have a few questions how to simulate my problem. Hope I can find some help here. First my problem: I have two identical magnetic disks. These disks are so positioned...
  29. T

    How to derivate Maxwell Boltzmann Distribution

    Hi PFers. I am interested in Maxwell Boltzmann Distribution. I have searched in Internet for the derivation but I am not satified with them. Can somebody show me the way to derivate it? Thanks. ψ(v)=(m/2*pi*kT)^(3/2) e^(-mv^2/2kT)
  30. M

    Prove Maxwell Eqs. Covariant: Wave Eqn & 4th-Vector Pot.

    Is it enough to see the covariance of the wave equation the fourth-vector potential (\phi, \bar{A}) satisfy? I mean, is this enough to prove the covariance of Maxwell equations? The equation would be ∂_{\mu}∂^{\mu}A^{\nu} =\frac{4\pi}{c} J^{\nu}
  31. J

    Ansoft Maxwell 3d Closely coupled inductor

    Hello! I am having an issue with getting any graphs on inductance or induced voltage. In the attached circuit: What I have is a 28Vac source w/ 400hz and 2 coils (R=18.6ohm each) that are connected with a common. In the model: I have a core in the center that will be able to move up...
  32. S

    MAxwell reciprocal theorem and symmetric stiffness matrix

    As per Maxwell reciprocal theorem, it is valid only for elastic materials and structures indergoing small displacements.That is k12 = k21, kij = kji hence stiffness matrix is symmetric. Howbver, I just have been going through MY OWN written programs for geometric non linear problems and I...
  33. J

    Maxwell Equations and Fourier Expansions

    Homework Statement The field E(r,t) can be written as a Fourier expansion of plane waves E(r,t)=∫E(k,w)e^{i(kr-wt)}d^{3}kdw with similar expansions for other fields. Need to show the derivation of kXE(k,w)=wB(k,w) from Faraday's law ∇XE(r,t)=-∂B(r,t)/∂t and also the derivation of...
  34. T

    Most probable values of the Maxwell Boltzman distribution

    To preface my problem, you should know what I'm deriving. When I try to find the most probable speed of a classical, nonrelativistic particle as described by the Maxwell speed distribution I find that it is vmp=(2*k*T/m)^(1/2). The kinetic energy associated with this particle would then be...
  35. Y

    Is the Maxwell Speed Distribution Applicable in an Ideal Gas with Fixed Energy?

    I want to know if the Maxwell speed distribution is the following. An ideal gas system of n particles, say constrained to the unit box, has the phase space ([0,1]^3 x R^3)^n. That is, [0,1]^3 for the position of a particle, R^3 for the velocity, and all to the n since there are n particles...
  36. P

    Deriving 3 Momentum & Angular Momentum Operators of Maxwell Lagrangian

    Hello, Where can I find a good explanation (book) of the derivation via Noether's theorem of the three momentum and angular momentum operators of the usual maxwell lagrangian ? Thank you!
  37. S

    What is Maxwell Distribution, Thermal Equilibrium, Fluctuation and Wein's law?

    I was reading a book, 'Introducing Quantum Theory' by J.P.McEvoy, and I find it difficult to understand in details of Maxwell Distribution, Thermal Equilibrium, Fluctuation, Wein's law and Planck's quantum theory, so I am finding it difficult to follow Einstein's explanation of photoelectric...
  38. W

    Paradox about Maxwell near an accumulation of charge

    Hi. I am trying to understand Maxwell's equations. I am used to Gaussian units. The following sums up what I do not understand. (Or at least one thing I do not understand ... ) Let x0 be a position situated in a vacuum, with no photons in it, next to an infinite pane of glass. Ions arrive at...
  39. M

    Covariance of Maxwell Eqn. - conceptual question

    Hey all, This has been bugging me for quite a while now. My question is essentially about how one shows that Maxwell equations are invariant under Lorentz transforms. Writing them in index notation, it is usually appealed to that all terms involved are Lorentz tensors (or contractions thereof)...
  40. R

    Maxwell Boltzmann Speed Distribution

    Homework Statement The three quantities Vmost probable, Vaverage, and Vrms, are not the same for the Maxwell speed distribution in 3D. If you restrict the gas to only be one dimensional, are these three quantities equal to each other? Justify your answer with a short explanation. Homework...
  41. U

    How can I simulate a two-coil problem in ANSYS Maxwell 13?

    Hi everybody, I would like to compare inductance (self and mutual) calculations using FEMM and Maxwell 13, both 2D problems. In FEMM this is very simple and I just use an axissimetric solution, enter the desired frequency, currents and get the results. When using Maxwell...
  42. B

    Using the Maxwell distribution laws to prove the collision flux equation

    I have for a while been trying to understand the setup of this equation in calculating the collision flux of a gas through a given rectangular surface of area A: Number of collisions in a time interval Δt is (\frac{N}{V})AΔt\int^{∞}_{0}v_{x}f(v_{x})dv_{x} where f(v_{x}) is the fraction of...
  43. S

    Transform Maxwell Equations into k-space

    Dear fellow physicists, looking at the derivation for the maxwell equations into k-space, I've stumbled upon something that seems not so logical to me. It is concerning the two parts where they transform \nabla \times E and \nabla \bullet E on page 27 (on the sheets 14)...
  44. F

    Maxwell Tensor Symmetries Problem - Federico

    Hi community: I'm Federico and I'm new user here! I'm trying to show that the Electromegnetic Field Tensor F_{ab} = 2A(r) (e_{0})_{[a}(e_{1})_{b]} + 2B(r) (e_{2})_{[a}(e_{3})_{b]} where (e_{0},e_{1},e_{2},e_{3}) is the tetrad basis associated with the metric ds^2=...
  45. G

    Galilean transform and the maxwell equations

    So I keep hearing that the maxwell equations are variant under Galilean transform. Tired of simply accepting it without seeing the maths, I decided to do the transformation on my own. To make things easy, I only tried Gauss' law, furthermore I constricted the field to the x-axis only. So I have...
  46. H

    Priniciple of Minimum Energy vs. Maxwell equations

    Dear all, I'm studying a paper on coupled magneto-mechanical problems. Suppose we have a "deformable" ferromagnetic bar placed in an initially uniform magnetic field. Both ends of the bar are clamped. The bar has magnetostriction property, so it may expand or contract depending on the the...
  47. S

    How to put mur's absorbing boundary condition in 1d fdtd maxwell equation

    hi can anyone teach me how to put Mur's ABC in my fortran code for 1d fdtd maxwell's equation as below !1d fdtd Simulation in free space subroutine fd1d01(f0,miu,delta,S,E0) implicit none double precision :: f0 !frequency double precision...
  48. C

    FEM tools like MAXWELL , FLUX , MOTOR CAD

    Hi all, I want to learn tools like MAXWELL 2d 3d , MAGNET, FLUX etc. I want to know if I'll need to know CAD and FEM Analysis to learn the above mentioned tools. Thankyou, Chaitanya
  49. E

    Dynamic Maxwell equations, uniqueness theorem, steady-state response.

    Hello, I'm trying to make a sort of "system theory approach" to dynamic Maxwell's equations for a linear, isotropic, time-invariant, spacely homogeneous medium. The frequency-domain uniqueness theorem states that the solution to an interior electromagnetic problem is unique for a lossy...
  50. T

    Maxwell Equations in Tensor Notation

    2A\mu=-\muoJ\mu Griffith's Introduction to Electrodynamics refers to this 4-vector equation as "the most elegant (and the simplest) formulation of Maxwell's equations." But does this encapsulate the homogeneous Maxwell Equations? I see how the temporal components lead to Gauss' Law, and I'm...
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