What is Fields: Definition and 1000 Discussions

FIELDS is a science instrument on the Parker Solar Probe (PSP), designed to measure magnetic fields in the solar corona during its mission to study the Sun. It is one of four major investigations on board PSP, along with WISPR, ISOIS, and SWEAP. It features three magnetometers. FIELDS is planned to help answer an enduring questions about the Sun, such as why the solar corona is so hot compared to the surface of the Sun and why the solar wind is so fast (a million miles per hour).The host spacecraft, Parker Solar Probe, was launched by a Delta IV Heavy on August 12, 2018 from Florida, USA. On August 13, 2018 FIELDS became the first instrument to be activated including beginning deployment of the 4 whip antenna (clamps unlocked) and extension of the magnetometer boom. On September 4, 2018 the whip antennas were deployed.

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  1. N

    Non-classically, do magnetic fields do work?

    I know this question has been beaten to death, but I haven't seen a response that clearly (to me) answers the following: 1. Magnetic fields *can do work* on intrinsic dipoles, right? (e.g. two electrons can do work on one another via their intrinsic spin). 2. Magnetic materials can do work on...
  2. A

    Apparent paradox in no costants fields

    if there is an uniform, infinitly extended,magnetic field that is changing with a law B(t), I can calculte the induced electric field using an arbitrary circle; then the induced circuitation on the circle is \epsilon _i=-\pi r^2 \frac{dB(t)}{dt} , and since the symmetry of the system ( infact...
  3. P

    Are discrete particles and fields both present in Quantum Mechanics?

    Does QM contain both discrete particles and fields? If so, why aren't these two mutually exclusive? It seems like one is chunky and the other continuous.
  4. R

    E and B Fields of Monochromatic Plane Waves

    Homework Statement 560 nm light is collimated and passes as a parallel beam in a direction perpendicular to the ##x+y+z=0## plane. It is polarized parallel to the ##(y-z)## plane. Treating it as a plane wave, what are the real E and B fields? Intensity of the beam is ##1 \ mW/cm^2##. Make...
  5. L

    How to show that Electric and Magnetic fields are transverse

    Homework Statement This isn't necessarily a problem, but a question I have about a certain step taken in showing that the electric and magnetic fields are transverse. In Jackson, Griffiths, and my professor's written notes, each claims the following. Considering plane wave solutions of the...
  6. R

    Electric fields and capacitors

    Hi guys, I was tutoring some students and I was explaining them how to calculate the capacitance between two parallels planes. They made me some questions and actually I am not quite sure about my answers! I started by showing them how to calculate the electric field generated by a single...
  7. S

    Deriving Einstein Tensor & Inverse for Gϴdel Metric in Cartesian Coordinates

    For the Godel metric (in Cartesian coordinates), I derived the Einstein tensor Gμν as well as its inverse Gμν in a coordinate basis. I tried converting the inverse into an orthonormal basis using a technique for this that was taught to me on another thread long ago. When I tried using said...
  8. S

    Which STEM fields are actually in demand in the US now?

    Hi everyone. I have written similar threads about this in the past, but I thought that now would be a good time to revive this topic (as a snapshot of STEM demand, if you will). So I would like to ask the following questions: 1. Which STEM fields are actually in demand in the US as of 2015? 2...
  9. W

    Magnetic fields out of long wires

    Homework Statement Assume that I = 5.0A. What is the magnetic field at point b in the figure? Give your answer as a vector. Homework Equations Ampere's Law - B = (μ0I)/(2πr) The Attempt at a Solution I tried plugging the given numbers into Ampere's Law for point b, which gave me B =...
  10. E

    How Does the Higgs Field Influence the Standard Model and Particle Masses?

    Problem I have a project for my university class on the Higgs fields and how it impacts the standard model, and how the Higgs particle is formed and decays into particles with the probability of decay based on the mass of the particles it will decay into. I need resources that I can cite like...
  11. A

    Electric Fields: Oscillating point charge

    Homework Statement Reading a journal from that crazy old retired physics professor on the hill, you stumble upon a scheme to generate high frequency (HF) radio waves (λ = 10 m). It requires generating an electric field that diverges from a point and increases in strength linearly with respect...
  12. M

    Physics applications in cancer research/treatment

    I am a third year undergraduate physics major. Often time people ask what I want to do with physics, and I didn't really have an answer for them. I guess I always assumed I'd pursue a masters degree in some kind of engineering, but I want to be able to do something that I'm passionate about...
  13. D

    Help! EM Exam: Covariant LW Fields Derivation Questions

    Hi I am doing some exam revision for an EM class and I'm trying to understand a few things about this derivation. Specifically in equation 18.23 why do we not consider the derivative of the four velocity i.e ##\partial^{\alpha}U^\beta## Then going from 18.23 to 18.25 why is...
  14. Coffee_

    Complex analysis and vector fields

    I'm going to ask a very general question where I just would want to hear different possible methods that can be thought of in this kind of problem. I am trying to solve a very specific problem with this but I won't talk about that because I don't want someone to give me the answer but ideas for...
  15. R

    Total energy and power of electromagnetic fields

    Homework Statement Consider the charging capacitor in problem 7.34 (A fat wire, radius a, carries a constant current I, uniformly distributed over its cross section. A narrow gap of wire, of width w, w<<a, forms a parallel-plate capacitor) a) Find the electric and magnetic fields in the gap, as...
  16. R

    Becoming an All-Rounder: Taking Multiple Fields of Study

    I like getting all knowledge and also like being an all rounder. I like Maths, physics and chemistry. I think in mechanical engineering only mechanics is taught. In which branch all topics are taught? Or can one choose various fields like elec engineering, chemical engineering, computer science...
  17. P

    Using magnetic fields to pickup radio freguencys

    a simple idea. Maxwell’s theory of magnetic fields says there is two components ,an electrical field and a magnetic field. (put simply). I have an idea to pick up radio waves using a magnetic beam. rather than the normal dipole set-up, just wondering if you think this idea is possible to make...
  18. V

    Magnetic Field Strength in a Solenoid at t = 1 ms

    Homework Statement What is the magnitude of the magnetic field inside the solenoid at t = 1 ms? Homework Equations Not sure The Attempt at a Solution Well I would make an attempt but firstly I have a question. What I want to know is the above question simply referring to the emf of the...
  19. S

    Coulomb's Law and Electric Fields

    Examine the charge distribution shown: b) What is the net electric field acting on charge 1? Attempt at the answer: E2 = Kq2/r2^2 = (9.0 x 10^9 Nm^2/C^2)(3.0 x 10^-5 C) / 2.0m^2 E2 = 6.75 x 10^4 N/C E2 = E3 ( therefore, same procedure) eNet = Sqr.rt. 6.75 x 10^4 N/C^2 + 6.75 x 10^4 N/C^2...
  20. Calpalned

    Using Green's Theorem for Vector Fields

    Homework Statement Homework Equations n/a The Attempt at a Solution I don't understand how the book went from calculating Green's theorem on ##\int _c Pdx + Qdy + \int _{-c'} Pdx + Qdy = ## (1 in the attached picture) to getting (labeled 2) ##\int _c Pdx + Qdy = \int _{c'} Pdx + Qdy ##...
  21. B

    Understanding Gravitational Fields: Patterns, Potentials, and Velocity

    Homework Statement Need someone to confirm if I answered correctly. Thanks for your support :) A) Draw the pattern of the gravitational flux passing through a horizontal surface A, of area 1m² close to the Earth's surface. B) What is meant by the phrase "Gravitational potential at a point in a...
  22. I

    What are Electric & Magnetic Fields composed of?

    Field of what exactly? Sounds is vibrations in air molecules. Electromagnetic waves are vibrations in fields of what? Where are these fields existing? Wiki states that fields are "A field is a physical quantity that has a value for each point in space and time." Where is the physical...
  23. I

    Why do electromagnetic fields exist where there is no matter

    Wikipedia define EM field as "a physical field produced by electrically charged objects" But there are no electrically charged objects in between cosmic entities and yet Wiki states "The electromagnetic field extends indefinitely throughout space". What am I missing here?
  24. Domenico94

    Cancer Therapy - Electromagnetic fields

    Hi everyone. I'm an electronics eng. student, and, during my studies, and my life outside university, I've heard several times of how electromagnetic fields could affect our body, in a way or another. There are also various resources talking about how these fields can attack cancer...
  25. I

    Working in a lab with magnetic fields: Bio-hazardous?

    I am meeting a professor this week to see if I can work in his lab. His area of research is magnetism. In a preliminary meeting, he told me that the 'ambient' magnetic field in the lab is about twice the magnetic field of the earth. I spent about 10 minutes in the lab. There was a machine with...
  26. M

    What is the true nature of photons and their interaction with magnetic waves?

    1. I have heard that if you take 4 batteries and 2 non-coated wires, and run the wires + to -, with current flowing in opposing directions, with the wires in close proximity, that a magnetic field will be created between the 2 wires. Is this true? 2. Since photons have no charge, is there...
  27. Shinwasha

    Struggling with a concept in regards to electric fields

    So I'm trying to figure out the electric field that is acting on a point. This point is .3 m right of a point charge with -2N/C and .8m from a point charge with +4N/C. I've drawn it out, and realize both will have an impact on this object. what the issue I'm having is figuring out a formula to...
  28. V

    Ranking Forces on a Charged Particle in Uniform Electric and Magnetic Fields

    Homework Statement The below region of space shown has uniform electric and/or magnetic fields, dependent on the conditions listed for cases A-G. Identical positively charged particles enters these regions with the same velocity. Rank the magnitude of the force on the particle just after it...
  29. V

    Magnetic fields, charged particles and directions

    Homework Statement [/B] Charged particles with equal mass and identical initial velocities move through regions of space that may have magnetic fields. Rank the magnetic field in each case from greatest to least. For this question, fields out of the page will have positive values, while fields...
  30. D

    Neutrons in electromagnetic fields

    Consider a moving neutron passing by an electromagnet, will a neutron be deflected? This video seem to show that the neutron would have to be charged in order for it to move
  31. R

    Engineering Electrical Engineering fields close to Physics

    Hello everyone, I am a junior year EEE student ( in a South Asian country ) and I will have to declare my thesis topic pretty soon. Anyway, the reason I am here is that I love Physics and want to migrate to something that is more heavy on the theoritical side. Things like particle physics...
  32. S

    Properties of fields in quantum field theory

    I have been studying quantum field theory and I am currently in the Lagrangian field theory chapter in my book. Now it says that the energy momentum tensor is as follows: Tμν= [∂L/∂(∂μφ) * ∂νφ] - δμνL Note: I am using L to symbolize Lagrangian density and not just Lagrangian since the latex...
  33. P

    How Does Reversing Current Affect Magnetic Field Directions?

    Homework Statement Please refer to attachment for solution. Can you help with the following (please refer to attached). If I understand the problem, both magnetic fields B1 & B2 need to change direction, due to the change in current (I) by replacing the positive with a negative ion. Your...
  34. cvex

    How to get the laplacian of a scalar field?

    Hi, I am trying to calculate the laplacian of a scalar field but I might actually need something else. So basically I am applying reaction diffusion on a 2d image. I am reading the neighbours, multiplying them with these weights and then add them. This works great. I don't know if what I am...
  35. nuclearhead

    What functions of fields describe particles?

    I was thinking about the connection between fields and particles. For instance the scalar field Φ(x) and the field Φ(x)+a both represent the same scalar particle. Because the action ∫∂Φ∂Φdx^4 is unaltered and the propagator <0|[Φ(x)+a,Φ(y)+a]|0> is presumably the same. What about if we replace...
  36. julianwitkowski

    Magnetic Fields / Force / Current

    Homework Statement A magnetic field of 1.4 T [N] is 4.0 m wide. A very long wire crosses the field. a) If the current in the wire is 2.0 A [W]. find the magnetic force on the wire. Create a diagram. b) What will happen to the force on the wire if... i. The wire is rotated slightly in the...
  37. R

    Traits of a Fields Medalist: Pursuing Excellence in Mathematics

    I want to preface this by saying the question is a little tongue in cheek, I don't personally think that pursuing fame and glory is a good reason at all to be pursuing a career in mathematics. However, I would like to know what people here feel are the sort of traits that mathematicians who...
  38. julianwitkowski

    Diagram for Charge Directions-Electron Path-Magnetic Fields

    Homework Statement A magnetic field of 0.0200 T [up] is created in a region. a) Find the initial magnetic force on an electron initially moving at 5.00 E+6 m/s [N] in the field. b) What is the radius of the circular path? c) Make a sketch showing the path of the electron. Electron Charge =...
  39. J

    Electric Fields and Charges Fill in the blanks

    Homework Statement [/B] Select the answers which complete the statements below (e.g., if answer A completes the first statement, and answer B the others, enter ABBBB). A) positive B) negative C) neutral D) cannot tell A positive point charge is brought near the outside surface of a...
  40. C

    Connections and tensor fields

    Homework Statement Let ##T## be a ##(1, 1)## tensor field, ##\lambda## a covector field and ##X, Y## vector fields. We may define ##\nabla_X T## by requiring the ‘inner’ Leibniz rule, $$\nabla_X[T(\lambda, Y )] = (\nabla_XT)(\lambda, Y ) + T(\nabla_X \lambda, Y ) + T(\lambda, \nabla_X Y ) . $$...
  41. Y

    Coulomb's Law and Electrical Fields

    Homework Statement The tine sphere at the end of the weightless thread has a mass of .60g. It is immersed in air and exposed to a horizontal electric field of strength 700 N/C. The ball is in equlibrium in the position shown. What are the magnitude adn sign of the charge on the ball? Homework...
  42. PsychonautQQ

    Need help understanding splitting fields

    My textbook is going through an example on splitting fields. It asked to find a splitting field for x^4 - 6x^2 - 7 over the rational numbers. This polynomial factors to (x^2 - 7)*(x^2+1) which has roots of 7^(1/2) and i. So i figured the extension field E we are looking for is Q(i)(7^(1/2)), but...
  43. D

    Time-ordered product of real scalar fields

    Hi guys, So I've got a real scalar field which is the sum of the positive frequency part and negative frequency part: \phi(x)=\phi^{(+)}(x)+\phi^{(-)}(y) and I'm looking at the time-ordered product: T(\phi(x)\phi(y))=\theta(x^{0}-y^{0})\phi(x)\phi(y)+\theta(y^{0}-x^{0})\phi(y)\phi(x) for...
  44. I

    Vector space and fields question

    Homework Statement Let V be a vector space over the field F. The constant, a, is in F and vectors x, y in V. (a) Show that a(x - y) = ax - ay in V . (b) If ax = 0_V show that a = 0_F or x = 0_V . Homework Equations axiom 1: pv in V, if v in V and p in F. axiom 2: v + v' in V if v, v' in V...
  45. Jesus

    Superluminal propagation of fields

    I am reading about the Velo-Zwanziger problem in which particles with spin higher than 1 propagates faster than light when the particles are coupled with an electromagnetic field. In the original paper: G. Velo and D. Zwanziger, “Propagation And Quantization Of Rarita-Schwinger Waves In An...
  46. S

    Electromagnetism: Magnetic Fields

    Homework Statement Two charged particles (P & Q) are fired into a uniform magnetic field that is directed into the page. When a particle possessing charge q moved through a magnetic field B at a velocity v it experienced the lorentz force that has a magnitude of F=qvB. What is the sign of P...
  47. C

    Operator Fields: Introduction for Quantum Field Theory

    Hi, are there any math texts out there that are good introductions to operator fields as used in quantum field theory ("fields" in the physics, not mathematical sense, in this case.)?
  48. B

    Tensor Fields - Tensor Product of Two Gradient Operators

    I'm trying to re-derive a result in a paper that I'm struggling with. Here is the problem: I wish to calculate (\nabla \otimes \nabla) h where \nabla is defined as \nabla = \frac{\partial}{\partial r} \hat{\mathbf{r}}+ \frac{1}{r} \frac{\partial}{\partial \psi} \hat{\boldsymbol{\psi}} and...
  49. M

    Electron traveling between two plates. Electric Fields?

    Homework Statement An electron traveling horizontally east passes between two horizontal, oppositely charged plates and is deflected downward. Part A: Passing through the same space between the plates, in what direction (if any) a proton traveling horizontally east would be deflected? Part B...
  50. T

    What are the most relevant and most researched fields?

    What fields or branches of physics are most researched today? Which has the most unsolved mysteries?
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