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. D

    Nikola Tesla or James Clerk Maxwell?

    Which do you think of the two contributed most to humankind.
  2. B

    Maxwell speed distribution

    halo, I´m stuck in an definite integral... P(v)=4π (M2πRT)3/2⋅v2⋅e−Mv2nRT (maxwell speed distribution) How can I calculate the fraction of Ar in mars? pd. I got already the scape velocity But... How can I intregrate and evaluate between (0, 5XE3 m/s) or (5XE3 m/s, infinite) ...
  3. H

    Maxwell stress tensor for a nonlinear media

    Hi all, It seems to me that the derivation of Maxwell stress tensor is independent of the permeability of the media or the nonliterary of its B-H relation. By this I mean that we use μ0 in the equations rather than μ. Would you please confirm that?
  4. J

    Application of Maxwell Boltzmann velocity distribution to nanoscale systems

    Dear All I have a question about the validity of Maxwell Boltzmann velocity distribution in the case of nanoscale systems. When you consider a nanoscale system such as flow of water molecules (less than 100 molecules) through a carbon nanotube or graphene sheet, is it possible to expect a...
  5. S

    Numerical solution for 1d fdtd maxwell equation using yee algorithm

    Homework Statement to compute 1d fdtd maxwell equation using yee algorithm with fortran 90Homework Equations 1D discretization for maxwell equation (TEM mode) : electric field vector: Ez(i-1/2,n+1/2) = Ca*(Ez(i-1/2,n-1/2) + Cb(Hy(i,n)-Hy(i-1,n) magnetic field Hy(i,n+1) = Da*(Hy(i,n) +...
  6. J

    Maxwell equations in Lorenz gauge

    In the Lorenz gauge, the Maxwell equations reduce to four inhomogenous wave equations, with the charge density acting as the source for V, and the current density for A. For now, just take a static charge distribution -- say, a point charge at the origin. It is well known that a static...
  7. J

    Help with simulation in ANSYS Maxwell, 3D electromagnetism simulator

    Hello, I'm currently conducting a very serious high school research project titled: Maximizing Energy Efficiency of a Linear Electromagnetic Accelerator I have recently been bestowed with a temporary license for a very advanced 3-dimensional electromagnetism simulator that should allow me...
  8. R

    Ansoft Maxwell, "cannot apply Current Excitation to non planar entity" error

    Hello I am new with Maxwell. I made a motor drawing in solidworks and imported it in maxwell. I found some tutorials, and searched on the internet but could not find answer to my problem. So when i try to assign Excitation Current to an coil i get the message Excitation 'Current1' : Cannot...
  9. S

    Maxwell - Faraday equation.

    This may be a stupid question, but nonetheless it is confusing me (maybe I am stupid :p) The equation states that there is an induced emf in a loop when there is a change in magnetic flux through that loop. Or V = -d\phi/dt Though how does it work when you have self induction and induction...
  10. L

    Integrating by parts Maxwell Lagrangian

    I attached a file that shows the free EM action integral and how it can be rewritten. I would like to know how to go from the first line to the second. I have to integrate by parts somehow, and I know surface terms get thrown out, but I do not know how the indices of the gauge fields should be...
  11. H

    Maxwell Stress Tensor: Application & Force Calculation

    Hello everyone, I have a confusion about the application of Maxwell stress tensor: I have read some materials about Maxwell stress tensor and its application in calculating electromagnetic force on a body. To this end, a closed surface is assumed around the body and a surface integral on...
  12. F

    Original Maxwell equations versus todays version

    How does todays "modern" form of Maxwells equations differ from the original equations Maxwell developed and why? If this should be in the physics section...please move it...
  13. L

    What's wrong with my transformer model with Ansoft Maxwell

    Hi, I had modeled a simple transformer with Maxwell 3D (one closed iron and 2 coils), all seems all right except the output voltage, I have only 300 mV and I must have 12V ! I join the files, if someone can help me ? A strange thing is the StrandedLoss which up to 350 kW ! where's come from...
  14. L

    How to measure power in Ansoft Maxwell 3D ?

    Hi, I would like to measure the power give from a source to a transformer and measure the power consume by a RL component. I see only voltmeter and amperemeter in circuit editor, it's not possible de put wattmeter ? Or maybe there's another solution for find the power ? Thanks in advance ;)
  15. M

    Maxwell equations, curl problem

    I have a question here about Maxwell's equations: according to faraday's law at some point in space changing magnetic field with time creates the curl of electric field at that point and according to Ampere's law with Maxwell's correction changing with time electric field or electric current...
  16. H

    Maxwell almost failed his qualifying exam

    I have heard a story from one of my professors that Maxwell had failed the first two questions of his qualifying exam, and as a last chance, they gave him a take-home assignment. Maxwell returned with the Maxwell-Boltzmann distribution of velocities. Can anyone verify also hearing a similar...
  17. M

    Maxwell equations, curl problem

    The differiantial form of faraday's law tells that at a any point in space changing with time magnetic field creates the rotor of electric field (let's say circular electric field at that point), but in the centre of the circular field there is no E vector, it's zero, there only is it's rotor...
  18. L

    How simulate a transformer with Maxwell Ansoft?

    Hi, I would like to simulate a standard transformer (2 coils + 1 closed iron) with Maxwell 3D (V15) but I don't find tutorial or example. Maybe someone can explain how can I do ? I want to see the flux in primary and secondary. And I want to put a tension in primary and see the current in...
  19. C

    Current term maxwell equations

    yo ok progress on the electromagnetic wave front is progressing nicely...finally, but i have stumbled on a area that i need some help with. see below when maxwell took amperes law, he added what's known locally ! as the current term, this was done because he realized that a changing...
  20. C

    General questions on Maxwell equations

    yo ! quick question on jc maxwell, got an exam comming up and was wondering see attached these are the equations for free space (vacuum) and i was wondering if these will still hold for simple media such as plain old atmosphere (the breathable kind). following this can simple medium be...
  21. C

    Understanding Maxwell's Magnetic Field: A Homework Inquiry

    Homework Statement http://i.imgur.com/TqeA1.png Homework Equations The Attempt at a Solution I use right hand rule, I get answer B and A. Not sure how it gets wrong...
  22. V

    What is the basic difference between Maxwell and Gaussian Distribution?

    Can anyone tell me the basic difference between Maxwell and Gaussian distribution? Thanks in Advance
  23. T

    Calculating the energy-momentum tensor for Maxwell Lagrangian

    Hi guys, can you help me with this? I'm supposed to calculate the energy momentum for the classic Maxwell Lagrangian, \mathcal{L}=-\frac{1}{4}F^{\mu\nu}F_{\mu\nu} , where F_{\mu\nu}=\partial_\mu A_\nu-\partial_\nu A_\mu with the well known formula: T^{\sigma\rho}=\frac{\delta\mathcal{L}}{\delta...
  24. M

    Maxwell 3D eddy current simulation for a cylindrical wire

    Hi, I am trying to do a simulation for the current distribution in a cylindrical conductor wire using MAXWELL 3D. I used eddy current solver and assigned excitation of current 1A at both ends of the round wire. (I set length L=2mm, radius R=1mm) The field plot seems ok, having highest current...
  25. A

    Direction of the Maxwell stress tensor

    Homework Statement Show that in vacuum the pressure tensor of a (complex) plane electromagnetic wave only has a contribution for both directions in this bivector being along the direction of motion, and that contribution is equal in magnitude to the energy density. HINT: Choose 3 orthogonal...
  26. W

    Maxwell field wedge product basis

    Homework Statement The problem is to write it in terms on coordinate basis using the wedge product, F=F_{\mu\nu}dx^{\mu}\wedge dx^{\nu} from the basis with the tensor prdouct. Homework Equations The EM field strength tensor can be written, with a coordinate basis, F=F_{\mu\nu}dx^{\mu}\otimes...
  27. I

    Deriving Hubble redshift in closed Universe from Maxwell equations

    Homework Statement I should derive the Hubble law redshift from Maxwell equations in closed Universe. Homework Equations The metric of closed Universe is ds^2 = dt^2 - a^2(t)\left(d\chi^2 + \sin^2 \chi d\theta^2 + \sin^2 \chi \sin^2 \theta d\phi^2\right). The Hubble law redshift: \frac...
  28. G

    Beer–Lambert law from Maxwell equations?

    hi is it possible to derive the Beer-Lambert law directly from Maxwell's equations? cause i have to derive it and i have only seen some geometrically motivated derivations but i need a proper one.
  29. L

    Maxwell elements in parallel

    Homework Statement Not sure this is the right place for this but here it goes... I am trying to figure out the derivation of the force elongation relationship of the maxwell elements in parallel in order to derive it for the Kelvin Voigt elements in series. I have attached the material that I...
  30. R

    Vector calculus identities and maxwell equations

    so we have the identity \nabla\times\nabla\phi = 0 and from Maxwell's equations we have \nabla\times \textbf{E} = -\frac{d\textbf{B}}{dt} But we also have that \textbf{E} = -\nabla\phi So the problem I'm having is this -\textbf{E} = \nabla\phi which i substitute into the...
  31. Matterwave

    E&M Maxwell equations and Stress tensor

    Hello, so I was asked a question in two parts (Peskin & Schroeder problem 2.1). The first part asked me to derive the source-free Maxwell's equations from the action: S=\int{d^4 x \frac{-1}{4}F_{\mu\nu}F^{\mu\nu}} Given that the vector potential itself is the dynamical variable. I derived...
  32. M

    Maxwell equations and wave equation in a medium

    Homework Statement Consider an isotropic medium with constant conductivity \sigma. There is no free charge present, that is, \rho = 0. a)What are the appropriate Maxwell equations for this medium? b)Derive the damped wave equation for the electric field in the medium. Assume Ohm's...
  33. A

    Solving Maxwell's Equations in Laser Cavity | Tips and Troubleshooting

    Hello guys, I've been trying to solve Maxwell's Equations in a laser cavity, with length L. However I cannot... I've searched over the net to find a proper solution but I couldn't. I started by taking a field E(x,y,x,t)=E0 e(x,y)e-jw te-jb z. I take the phasor E(x,y,z)=e(x,y)e-jb z and...
  34. D

    Missing step involving e for maxwell equ. solution

    Homework Statement I am following along in my book (Laser Fundamentals by Silfvast, pg 14), and I cannot understand how they got from one step to the next. Homework Equations Since it's quite lengthy, I'm going to dive into the middle of it. If you need more background information, let...
  35. S

    Galilean invariance of Maxwell equation

    always say us Maxwell equations are not covariance under Galilean Transformation They say merely this because of constant speed of light that the result of Maxwell Equations But there arent any excitability prove for Non-Ggalilean invariance of Maxwell equation I Decided try to show...
  36. S

    Independent equations of maxwell equations

    Maxwell equations are 8. we need them to determine electric and magnetic field. the component of magnetic and electric field are 6. in linear algebra say for solving a system of equation with n free variable, we need n equations to solving it uniquely. here arises a question and that...
  37. S

    From wave equation to maxwell equation

    in electromagnetic books, we see by the aid of vector calculus, we can reach to wave equation from Maxwell 's equations. is it possible to reach to Maxwell 's equations from wave equations? in the other word, in electromagnetic books we get Maxwell 's equations as phenomenological...
  38. S

    How we can check maxwell equations are covariant?

    every people know that covariance principle is important in physics. before Lorentz transformations and special relativity, how we can check covariance principle about Maxwell 's equations?
  39. S

    When are Maxwell Equations Generally Used?

    See Subject. What engineering tasks do they regularly get used? Building high-frequency components, antennas?
  40. P

    Maxwell equations in quantum mechanics

    Maxwell equations are based on the wave nature of electromagnetism so they can't explain why the electron revolving in Bohr's orbit does not emit radiations.So my question is can't the Maxwell equations be modified according to the particle nature(quanta) of electromagnetism
  41. C

    Maxwell equation in optics book vs in physics book, why?

    I noticed that in many optics/photonics book, the Gauss law is expressed as: \nabla.E = 0 However, in wikipedia, it is \nabla.E = \frac{\rho}{\epsilon_{0}} I assume that \rho is zero in optics cases but why? I think that is because we assumed there is no electric charges on the way? then what if...
  42. G

    Solving Maxwell Equations for the Electric Field: Is it Possible? - A Discussion

    hi i asked myself whether it is possible to solve the partial differential equation rot E=-dB/dt for the electric field. i assumed that at least for a few right hand sides this should be possible, but i have never seen anybody doing this.
  43. J

    Understanding Maxwell's Equations: Translating and Simplifying with Visual Aids

    I need some help figuring out if this document is correct: http://spazio.110mb.com/maxwell.pdf I tried to translate it into english but is far too complex for my english, so I tried to summarize it with a couple of images: http://spazio.110mb.com/immagini/maxwell.html I'd like to know...
  44. M

    What is a maxwell construction.?

    what is a maxwell construction...? What is a maxwell construction when applied to van der Waals isotherms?? please help, i really don't understand it. Thanks in advance
  45. S

    Maxwell Equation: Magneto Static Limit & Direction of H, B & M

    How does the Maxwell equation turns out in the magneto static limit? Please explain the context from the fundamental point of view? What is the direction of the H (field), B (induction) and M (magnetization) in a magnetic medium when exposed to external field? thanks in well advance
  46. C

    Questions about modelling a sensor with a target wheel in Maxwell

    Hi everyone, I need to model a crank sensor with a flying wheel in Maxwell. Crank sensor is made of permenant magnet, pole piece (to concentrate the magnetic field), and coil. There is a space between the target wheel and the crank the sensor. What I have to do is to simulate the output...
  47. M

    Maxwell model of viscoelastic behaviour - Derivation of governing equation

    Hi everyone, i'm a 3rd year undergraduate chemical engineering student from Scotland, and i am wondering if anyone could help me with the following past paper question in my plastics engineering class. The question is based on the maxwell model of viscoelastic behaviour. Apologies if i have...
  48. L

    Maxwell Stress Tensor: Find Elements for Plane Wave in Z Direction

    Homework Statement find all elements of maxwell stress tensor for a monochromatic plane wave traveling in z direction and linearly polarized in x. Homework Equations Tij=\epsilono(EiEj-(1/2)\deltaij E2+1/\muo(BiBj-(1/2)\deltaB2 The Attempt at a Solution So i found what E and B is well not...
  49. R

    Proof of Maxwell's Equation Wave Behavior | Maxell Eqn Help

    hello Can someone write me the proof, according to Maxwell's equation for magnetic field behaves like a wave?? thanks
  50. J

    Maxwell speed distribution

    Homework Statement Show that the number N(0,v), of molecules of an ideal gas with speeds between 0 and v is given by N(0,v) = N \left[ erf(\xi) - \frac{2}{\sqrt{\pi}} \xi e^{-\xi^2} \right] Where, erf(\xi) = \frac{2}{\sqrt{\pi}} \int_{0}^{\xi} e^{-x^2} dx And, \xi^2 =...
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