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. F

    Elevated EMF / AC magnetic fields in home

    Apologize in advance for the long post! We are in this particular situation and, being a novice with electrical- related issues, would greatly appreciate opinions here. After a year long search, we found this nice home in Texas meeting all requirements my wife and I were looking for, and at...
  2. B

    Spacetime and gravity and fields

    this might be a dumb question, but, if spacetime isn't a field and gravity is a property of spacetime. then gravity isn't a field either? (at least not a quantum field.)
  3. L

    Traveling electric and magnetic fields

    Hi this is my first thread since joining the website, so let me know if I am violating any rules here. I read a bunch of rules to follow in the website but don't think I can remember everything. I am reading chapter 18 on Feynman's Lectures on Physics volume 2 (electromagnetism). It talks...
  4. R

    Magnets and Magnetic fields

    Homework Statement Does the number of attached identical magnets linearly relate to the number of paper clips/bolts/nuts that are magnetically chained together? Homework Equations I have no idea. The Attempt at a Solution Yes they are linearly related? I am guessing that yes it...
  5. tristanm

    Electric Fields of Cylinders and Cylindrical Shells

    Homework Statement 1. Use Gauss' Law to calculate the electric field at a radius of 5.0cm from the z-axis 2. Use Gauss' Law to calculate the electric field at a radius of 8.0cm from the z-axis 3. What is the surface charge density σmetal on the outer surface of the metal cylinder...
  6. 2

    Understanding the Force on Current-Carrying Wires in Magnetic Fields

    Hi, I am a year 12 student and I have some some questions about magnetic fields. Homework Statement Do all magnetic fields (in particular ones produced by electromagnets) have distinct poles? How does a force act an object carrying current under presence of a magnetic field. Homework...
  7. S

    Explaining Electric and Magnetic Fields in EM Waves

    Hi, I've read that the speed of em waves in the vacuum is the electric field component frac the magnetic field component, why and how can this be explained more easily ? Thanks
  8. S

    What fields have the most postdoc positions?

    These days it seems like everywhere you apply one of the requirements is having "strong" and sometimes "extensive" "computational skills". Well I already started a masters in applied math (after my PhD in experimental physics = zero computational skills). Before starting the masters it...
  9. K

    Classical and quantum fields

    In QFT, all particles can be interpreted as excitations of some fundamental quantum fields in the vacuum. This is the quantum picture. But in classical world, only photons and gravitons have classical counterparts. How to explain this? The common feature of these two is that they are...
  10. N

    Newly introduced Academic fields?

    Hi! What are some newly introduced Academic fields like Mechatronics Engineering and Business Informatics?
  11. TrickyDicky

    Vector fields, flows and tensor fields

    Vector fields generate flows, i.e. one-parameter groups of diffeomorphisms, which are profusely used in physics from the streamlines of velocity flows in fluid dynamics to currents as flows of charge in electromagnetism, and when the flows preserve the metric we talk about Killing vector fields...
  12. A

    Simultaneous Equations and Fields

    Homework Statement What does it mean that basic arithmetic can be performed with two (non parallel) linear equations and that the resulting equation also intersects the same point? Proof and or anecdotal explanation would be much appreciated. Homework Equations If (α) 3y = 4x...
  13. nomadreid

    Defn. of information transfer in terms of fields

    I am attempting to get a good definition of the word "information", as in "information can be transferred at most at the speed of light".) Here is my attempt so far. Please indicate if this seems adequate. Starting from the definition in information theory: Given a probability...
  14. D

    Gravitational fields - move from A to infinity

    Homework Statement I have been trying solve this ask, but there is a problem. I don´t know how I can obtain an expression of infinity which is connected with angle. Picture is as Attach Files2. The attempt at a solution I think, I must use this equations AAB=m * ∫ * K dr = Δ Ek Is there...
  15. leviterande

    Do orbits in diamagnetic materials align to external magnetic fields?

    Hi, I am having a question about diamagnetism. I understand that ferromagnets realign with external magnetic fields. I know that besides diamagnets like copper, bismuth, that all matter exhibit some diamagnetism to some degree. I wonder though if these paired electron filled orbits of...
  16. S

    Electrical engineering fields with best job markets

    So I was just looking at graduate EE specializations and found some that interests me. I was just wondering which ones would have the best job markets. Electronics Circuits & Systems: Analog Circuits or Digital Circuits Power Electronics & Power Systems: Power Semiconductor Devices, Power...
  17. A

    Questions about quantum fields

    Sorry if this is not a very we'll written thread. I have already had to re-write this three times because of computer problems. I have cut out almost all of the text I had previously written and moved straight on to the main questions I have. Please be considerate of my young age, which is...
  18. J

    Slope Fields for First and Second Order ODEs | Definition and Generation

    I know that the standard definition for a slope field is ##\frac{dy}{dx} = f(x, y)##, but and if the equation given is a second-order ODE ##a\frac{d^2y}{dx^2}+b\frac{dy}{dx}+cy=0## or a system of first-order ODEs ##A\frac{d\vec{r}}{dt}+\vec{b}=\vec{0}##, the definition for slope field continues...
  19. J

    Exploring Field Derivatives: Rotational and Translational Tendencies

    Given a vector field f, I can compute the rotational tendency in the direction n (∇×f·n), the translational tendency in the direction t (∇f·t) and the divergence (∇·f) too. So, given a scalar field f, why I can compute only the directional derivative (translational tendency (∇f·t)) in the wanted...
  20. patrickmoloney

    How Do Electric Fields Affect Electron Motion Between Charged Plates?

    Homework Statement A uniform electric eld exists in a region between two oppositely charged parallel metal plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the positively charged plate, 2.00 cm away, in a time 1.8 * 10^{-8} s...
  21. KiNGGeexD

    Electrostatic fields- What defines an electrostatic field?

    I have a question about electrostatic fields! I was given these two equationsE= k [xy xˆ + 2yz yˆ + 3xz zˆ] E= k[y^2 xˆ+ (2xy+ z^2)+ 2yzzˆ] And asked to determine if either could be an electrostatic field, I'm not asking how to solve this problem but I'm not sure what defines an...
  22. J

    Are all closed forms exact? Are all exact forms closed?

    Every conservative vector field is irrotational? Every irrotational vector field is conservative? Every solenoidal vector field is incompressible? Every incompressible vector field is solenoidal?
  23. Entanglement

    Force fields and law of conversation of energy

    Why aren't force fields such as magnetic, electric and gravitational fields considered as a violation to law of conversation of energy?? :confused:
  24. N

    Engineering Most promising fields in engineering/physics

    What field would you say is the most exciting in engineering/physics? I'm defining engineering/physics very loosely, so don't worry if your field is more biology than physics or whatever. So anyway; Which has the most potential for financial profit and entrepreneurship? Which has the most...
  25. E

    Electric Potential and Fields

    Homework Statement Which one of the following statements best explains why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field? A) Work must be done to bring two positive charges closer together. B) Like charges repel one another...
  26. E

    Engineering Do engineers consistently change fields?

    This is something that has bothered me a lot since I tend to overanalyze and worry alot. In college, I studied physics and math, but decided that I wanted to get into engineering, so I applied and got a job at a defense contractor. However, I was terminated quickly because I was unable to get an...
  27. A

    QFT (derivative the covariant and contravariant fields)

    Hi, please help me .. How can I derivative covariant and contravariant fields? as in the attached picture Thanks.. http://www.gulfup.com/?tNXcaN w.r.t alpha
  28. F

    Does non-sinusoidal electric/magnetic fields generate EM waves

    why all EM waves are sinusoidal ? or this is not true at all, i.e., EM waves of other waveforms do exist ? the above 2 questions are among the most vague in classical EM theory, of which i studied many topics in collage as an electrical engineering student, and i liked the subject so i kept...
  29. T

    My understanding of Quantum Fields [Please correct me if I'm wrong]

    I believe I understand the basics of some fields, but I am unsure about the correctness of all of my knowledge. - All particles are excitations of their field (If it's a fermion) and the field they mediate (If it's a boson) - Electron repulsion is created by the exhcnage of virtual photons...
  30. C

    Are left-invariant fields mapped onto the manifold Killing vectors?

    Left invariant fields on a group G satisfies a lie algebra; say we have an n-dimensional Lie algebra for which the fields ##{X_1, \ldots , X_n}## is a basis. Let these satisfy the algebra ##[X_a, X_b] = c_{ab}^c X_c##. Suppose now that we have a Riemannian manifold with killing vectors...
  31. G

    Can Gravity Fields really cause Time-Dilation-Effects inside of them?

    Hi folks! I'll start by admiting that I'm a cockroach compared to Einstein or Hawking, and I think that due to Hawking's great mind, maybe he wrote the book in a way he found conspicuous. But I don't have Hawking's IQ, and for me is definitely harder to understand the concept of "Time...
  32. A

    Integrals over vector fields and Ampere's Law

    Homework Statement Experiments show that a steady current I in a long wire produces a magnetic field B that is tangent to any circle in the plane perpendicular to the wire and whose center is the axis of the wire. Ampere's Law relates the electric current to its magnetic effects and states...
  33. L

    Electric and magnetic fields VS electromagnetic waves

    Capacitors are popular candidates for explaining electric fields. The phenomenon becomes really apparent with the aid of a leiden jar ...which is really just a capacitor. Anyways, as long as you're cranking the handle on the electrostatic machine, the charge is going to build and build until I...
  34. Ascendant78

    Electric fields vs magnetic fields?

    Electric fields vs magnetic fields? Ok, so in class last week, I had asked my professor about using the Lorentz Force Law to solve a particular problem. When he responded with "we only have a magnetic force from the current in the wire, so we don't have to worry about an electric field," that...
  35. W

    Superposition of displacement fields?

    This isn't a homework question, however I'm curious if displacement fields can simply be added to find the total displacement field at some point. My instinct tells me this should be true. For linear media, D=εE. Since electric fields can be superimposed upon each other, shouldn't the same be...
  36. Y

    Exploring EE Research Fields for Postgraduate Study

    I've got one more year left to finish my undergraduate EE degree and I'm planning on continuing straight into a PhD. I've had the chance to work with a postdoc on remote sensing/space science research and I've really enjoyed it. I've also developed an interest in neuroscience and plasma physics...
  37. G

    Manipulation of Electromagnetic fields using curls clarification

    Homework Statement Question 1. General Plane Waves. We may represent a general electromagnetic plane wave by (real part of the complex exponentials) E=E_{0}*e^(i*k*r-iwt) B=B_{0}*e^(i*k*r-iwt) Show that Faraday's Law becomes iwB0=-ik x Eo Homework Equations dB/dt=- curl of E The...
  38. ShayanJ

    Exploring Singular Vector Fields & Gauss's Laws

    You're probably familiar with Gauss's laws in electricity,magnetism and gravitation: \oint_{\partial V} \vec{D}\cdot \vec{d\sigma}=q_V \\ \oint_{\partial V} \vec{g}\cdot\vec{d\sigma}=-4\pi G m_V\\ \oint_{\partial V} \vec{B}\cdot\vec{d\sigma}=0 \\ It is also known that the first two integrals...
  39. T

    Non-canonical terms of scalar fields

    Hello! Well, I guess it's all in the title, really. I was reading about k-essence, and it was described as a scalar field having a non-canonical kinetic term. I did a bit of browsing and couldn't find a clear explanation of what, exactly, a non-canonical kinetic term is. Any help would be...
  40. Ascendant78

    Question regarding magnetic fields being unable to do work?

    I'm currently taking Physics II and had a question. I'd ask my professor, but he's out of town until Monday and this is driving me crazy. Anyway, we recently started learning about magnetic fields. So far, I'm grasping most of it no problem. One thing that is throwing me off though is how...
  41. OtherRealm

    Project in neurobiology with only a limited background in these fields

    I have an idea for a research project in neurobiology but I have only a limited background in these fields (I currently work in web development). Is there any way to gain the necessary skills and have access to the right equipment to carry out the experiments I want to do without going back to...
  42. H

    Conceptual question help-Electric fields, potentials, etc.

    Conceptual question help--Electric fields, potentials, etc. Homework Statement 1) Assume that the electric field E is equal to zero at a given point. Does it mean the electric potential V must also be equal to zero at this point? If not, provide an example to prove your answer. if you think...
  43. Space Pope

    Fields in physics and fields in group theory, are they related?

    I just though of this and though "it's abstract math meeting physics, so probably not". After looking up fields in several abstract algebra books I thought that maybe fields in physics were called as such in physics because they share something with the mathematical structure of fields in group...
  44. F

    Potential and Electric Fields: Understanding Charges and Fields on a Line

    Homework Statement Consider a line of length L=0.950 m and uniform positive charge per unit length λ=2.9 μC. Point A is a distance x=0.23 m from the center of the line, while B is the same distance from the line but a distance y=0.28 m farther along the line; point C is a distance z=0.050 m...
  45. M

    Electric fields of a spherical shell

    My class hasn't delved into Gauss's Law much besides describing conductors at electrostatic equilibrium to have no net electric field or force within itself. For the picture, the question is: What are the magnitudes of the electric fields at: 1) r = a 2) r = 3/2 a 3) r = b...
  46. K

    Replacing the current by the fields in electromagnetism.

    hello, In electromagnetism from the Lagrangian formulation, one can defines a canonical momentum and applying Euler's equation to that momentum gives the lorentz law. To get the Lorentz law, one uses a vector identity, only available because it is said the speed V does not 'feel' the...
  47. E

    Expression of fields in Faraday rotation

    Hello! Talking about propagation of an electro-magnetic field in a non-isotropic medium, I've got some troubles with the expression in object, used to show the Faraday rotation of the polarization of a field. Homework Statement An electro-magnetic field enters a particular medium...
  48. 0

    Names - how much does it matter in the science&math fields?

    I am hoping for a name change soon, but I am considering the career implications for changing my name. The name I am planning on doesn't match my race, but California (where I live) is a melting pot and there are white Lopez and Martinez and Asian Masons. People will know that I changed my name...
  49. P

    Stress energy tensor for fields

    In the case of swarms of particles, the stress energy tensor can be derived by considering the flow of energy and momentum "carried" by the particles along their worldlines. Is there a way to interpret the field definition of the stress energy tensor from Wald, p455 E.1.26 T_{ab} \propto...
  50. R

    Can magnetic fields be altered to block cosmic radiation and charged particles?

    Greetings, PF forum members! I have had a sudden interest in Active Radiation Shielding (ARS), and as such, an increased interest in magnetics. I have had trouble locating any information regarding the possibility/impossibility of altering magnetic fields in such a way that changes the field's...
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