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. L

    Simple magnetic fields problem

    One component of a magnetic field has a magnitude of 0.0266 T and points along the +x axis, while the other component has a magnitude of 0.0648 T and points along the -y axis. A particle carrying a charge of +2.96 × 10-5 C is moving along the +z axis at a speed of 4.71 × 103 m/s. (a) Find the...
  2. B

    Electric Fields Cancelling Out?

    Homework Statement An example problem I am reading is about the electric field of a uniform ring of charge. I attached the diagram provided in the problem. What confuses me is that the electric field lines in the y-direction cancel out. Wouldn't the fields have to cross, if they were to...
  3. S

    Magnitude and Direction of Electric Fields

    Hey yall. This is a question from my homework but it's so basic that it's just to help with the concept for me. So the question is this: A small object A, electrically charged, creates an electric field. At a point P located 0.250 directly north of A, the field has a value of 40.0 directed to...
  4. L

    Simple electrostatic fields questions

    Imagine nine vertical and parallel lines drawn side by side. They represent infinite planes of uniform voltage. The first line has 0 V. The 2nd line has 1 V. The 3rd has 2 V and so on, with the 9th line having 8 V. The distance between each line is 1 cm, which is 0.01 meter. There is an...
  5. M

    Two problems on Electric Fields and Electric Potential

    Homework Statement 1st Problem (a) Consider the electric potential V = C . r, where C is a constant vector. Find the electric field E(r). (b) For a given uniform electric field E = E(0)z^, using part (a) find the electric potential for this electric field...
  6. M

    Attempting to find tension force with electric fields

    Homework Statement A small conducting sphere of mass 5.0x10^-3 kg attached to a string of length 20 cm, is at rest in a uniform electric field E. There is a charge of -5.0x10^-6 coulomb on the sphere. The string makes an angle of 30° with the vertical. Calculate the tension in the string...
  7. V

    Total energy stored in the electric fields, exess energy

    Homework Statement one capacitor is charged until its stored energy is 4.0 J, the charging battery then being removed. a second uncharged capacitor is then connected to it in parallel. if the charge distributes equally what is now the total energy stored in the electric fields? where the...
  8. A

    Question about velocity-dependent Lagrangian involving magnetic fields

    Homework Statement The Lagrange method does work for some velocity dependent Lagrangian. A very important case is a charged particle moving in a magnetic field. The magnetic field can be represented as a "curl" of a vector potential ∇B = ∇xA . A uniform magnetic field B0 corresponds to a vector...
  9. J

    Electric Fields and excess charge vs charge

    Hello, I have a few questions (with regards to conducting hollow spheres) . 1: What is the difference between a charge in the sphere and an excess charge coming out of the sphere or the charge resting on the outside of a sphere? 2: Image a conducting sphere that has a shell of a small...
  10. S

    Analysis of vector fields, fourier and harmonics

    Hi I am working on a optimization problem involving vector fields. In order to define a objective function I need a measure (scalar quantity) of some properties of the vector field. The vector field comes from a finite element analysis, that is the vector field is calculated on a discretized...
  11. R

    Why Do We Need Fields as Annihilation & Creation Operators?

    Can anyone tell me why it is necessary to express a field as annhilation and creation operators? I just don't see why we need a field to explain the creation of particles in relativity, after all two colliding particles with enough energy produce some more.
  12. D

    Classical Fields and Newton's 2nd Postulate of Motion

    Although I retired from active physics research almost 2 decades ago, there's a question that has annoyed/intrigued me for almost 40 years... In Classical Field Theory, matter has 2 intrinsic properties, namely mass and charge. Given Newton's 2nd Postulate, {\bf F}_{net} = m {\bf a}, I've...
  13. C

    Power loss due to ionisation of air from magnetic fields

    Hi, A current carrying wire creates a magnetic field around it, as shown here: http://courses.ae.utexas.edu/ase463q/design_pages/fall02/wavelet/3_sour8.gif As far as I am aware this usually doesn’t cause a power loss. Even if there is a flux on a nearby conductor there will be no power loss...
  14. F

    Notation related to quotient fields

    Homework Statement Let f(x) = x6 + x3 + 1 in Z_2[x]. Show that f(x) is irreducible. Let E = Z_2[x]/(f(x)), and let α denote the image of x in the quotient field. Show that E* = <α>. Homework Equations I have solved the first part, but what does E* mean? I have seen the asterix in...
  15. B

    Finding The Effect of Several Electrics Fields

    Homework Statement Four charged particles are at the corners of a square of side a as shown in the figure below. (Let A = 5, B = 2, and C = 7.) Homework Equations The Attempt at a Solution Well, I first found the electric due to each particle individually...
  16. B

    Where Do Electric Fields Cancel Out Between Two Charged Particles?

    Homework Statement In the figure below, determine the point (other than infinity) at which the electric field is zero. (Let q1 = -2.45 µC and q2 = 6.50 µC.) Homework Equations The Attempt at a Solution Here is a little commentary my author gives on this problem: Each...
  17. heycoa

    Optics | Electromagnetic Waves | Electric/Magnetic Fields

    Homework Statement An isotropic quasimonochromatic point source radiates at a rate of 100 W. What is the flux density at a distance of 1 m? What are the amplitudes of the E- and B- fields at that point? Homework Equations I think (but not at all sure) that the equation for flux density...
  18. R

    What instruments did gauss use to measure flux / electric fields?

    Gauss equations state that the flux of a gaussian surface is equal to the sum of all the electric field times the surface area. Although he stated this in theory, how was he able to prove it possible. What measuring device do people use to prove that this theory is correct?
  19. Q

    Particle motion + electric fields

    Homework Statement see attachment for question wording. a) find acceleration b) find horizontal displacement c) find final velocity vx=4.0*10^6m/s ε=4.0*10^2 N/C Δdy=0.02m mass of electron = me = 9.11*10^-31kg charge of electron = qe = -1.6*10^-19 C Homework Equations suvat...
  20. Spinnor

    Exploring the Possibility of Localized Light-Speed Fields in Outer Space

    Suppose we are far from a 1000 watt source of constant radio frequency electric dipole radiation, say R/λ > 1000. Suppose this antenna is in outer space so there is no matter to make things more complicated. Stop time. Does there exist some localized (say 90 percent of the field energy in...
  21. D

    Ampere's Law and Magnetic Fields

    Homework Statement I have a coaxial cable with current density Jo in the center, with radius a, going in -z_hat direction. This generates a magnetic field. The outside of the cable, radius c, also carries a current density Jout going in the +z_hat direction. This generates its own magnetic...
  22. Greg Bernhardt

    Quantum The Quantum Theory of Fields by Steven Weinberg

    Author: Steven Weinberg Title: The Quantum Theory of Fields Amazon Link: https://www.amazon.com/dp/052167056X/?tag=pfamazon01-20 Prerequisities: Contents:
  23. N

    How do you find the electric fields of regions between parallel infinite sheets.

    Homework Statement How do you find the electric fields of regions between parallel infinite sheets of charge? The set up: 3 parallel infinite sheets of charge a,b,c from left to right. Region 1 is to the left sheet a. Region 2 is between sheets a and b. Region 3 is between sheets b and c...
  24. S

    Finding E fields and potential given a hollow spherical conductor

    Hello, this is my first post here, so hopefully I do this in the right way... Homework Statement A hollow spherical conductor carries a net charge of 21.5 μC. The radius of the inner hollow is 5.2 cm and thee full radius of the sphere is 7.8 cm. At the center of the sphere, in the...
  25. C

    Linear Algebra - Infinite fields and vector spaces with infinite vectors

    Homework Statement Let F be an infinite field (that is, a field with an infinite number of elements) and let V be a nontrivial vector space over F. Prove that V contains infinitely many vectors. Homework Equations The axioms for fields and vector spaces. The Attempt at a Solution...
  26. D

    Uniform Electric Fields: Understanding Coulomb's Law and Field Intensity

    Coulomb's Law F = kqq/r^2 Why does the intensity of a uniform electric field not get weaker in the middle? I would understand this if the intensity over distance was a linear function, but it isn't. The force near one of the plates would approach infinity, because r^2 is so small... but in...
  27. S

    Conservative Vector Fields and Associated Potential

    Homework Statement Having issues determining what I am doing wrong, so perhaps one of you can pin point it. I have the solution, and I am extremely close to the same result, however, I am nonetheless wrong. Find the conservative vector fields potential. \vec{F}(x, y, z)=[(2xy-z^2)...
  28. Spinnor

    QED; electrons and photons, different fields, modes of a common field?

    In the Standard Model of particle physics are we to think of the electron(positron) field and the photon field as separate fields? Is it possible to think of the electron(positron) field and the photon field as just different "modes of vibration" of some more basic field? Can this line of...
  29. Spinnor

    Guess solution to fields by minimizing the action.

    Suppose I want to try and guess the fields of a short laser pulse. We know that fields that satisfy Maxwell's equations minimize the action E^2 - B^2 (say far from charge and current)? For a plane wave E^2 - B^2 = 0? Will a general solution of maxwell's equations satisfy E^2 - B^2 = 0...
  30. Spinnor

    Fields of a very short laser pulse, pulse a fraction of wavelength.

    Scientists can produce laser pulses of order one wavelength in "length" see, http://www.bbc.co.uk/news/science-environment-19489384 Do Maxwell's equations admit solutions of such short pulses? Can one approximate such a solution by multiplying a plane electromagnetic wave by the...
  31. Horv

    What is the path of a particle in a vector field?

    Hi all! I want to ask about vector fields. So if I had any kind of field for example \bar{F}(x,y) = (0,x) which represents a river or somthing similar and I put into the river a particle, or point-like body how can I get the path, or curve (flwo line?) from the vector field? I mean that path...
  32. Islam Hassan

    Fields as Results of HE Particle Collisions?

    Can the products of high-energy particle collisions include the creation of electromagnetic/strong/weak/gravitational fields (whether transient or not) in parallel with or in lieu of other new particles? IH
  33. P

    Physics The Fields of Particle Physics and Astrophysics/Cosmology

    I still have a long time to decide, but I am interested in the fields of particle physics, astrophysics, and cosmology. Here are my questions about them: 1. What field has the best outlook for the future? 2. Is there a degree that provides flexiblitiy in the choice? 3.What fields have the most...
  34. I

    Irreducible polynomials over different fields

    Problem: Let f be monic irreducible polynomial over a field F, k be monic irreducible polynomial over a field K, deg f = deg k. Let u be common root of f and k. Prove (or disprove by counterexample), that f=k over field (F intersection K), i.e. polynomials f and k are identical. Proof would be...
  35. L

    Polynomial finite fields; ElGamal decryption

    Homework Statement Given some ElGamal private key, and an encrypted message, decrypt it. Homework Equations Public key (F_q, g, b) Private key a such that b=g^a Message m encrypted so that r=g^k, t=mb^k Decrypt: tr^-a = m The Attempt at a Solution My problem is finding r^-a...
  36. J

    Electrodynamics without fields?

    Can one describe electrodynamics without any reference to fields? I think you can. Using the Heaviside-Feynman expression for the electromagnetic field due to an arbitrarily moving charge, together with the Lorentz force law, one can write down an expression for the electromagnetic force...
  37. Islam Hassan

    Matter as Excitation of Fields: Model or Reality?

    Are SM particles expected to really be i) simple excitations of their associated fields, ii) particulate matter which happens to be very conveniently (and precisely) modeled as excitations of such fields or iii) we can't judge one way or the other in the present state of our knowledge? If they...
  38. J

    Calculating Magnetic Fields in Cylinders w/ Currents

    Homework Statement Consider two infinitely long cylinders with radius a and b and currents: J = (Jo r)/a for r less than a -Jo for a less than r less than b Find the magnetic field in 1) r less than a 2) a less than r less than b 3) r greater than bHomework Equations The...
  39. S

    Modify crystallization process by electromagnetic fields?

    Has anyone come across an example where electromagnetic fields have been applied during crystallization processes. For example to modify crystal properties like magnetization or to change the polymorphism. In principle the use of electric / magnetic fields should change the formation of a...
  40. Islam Hassan

    Light from Distinct Electric and Magnetic Fields?

    If we set up an experiment in a chamber with distinct perpendicular oscillating i) electric and ii) magnetic fields, cycling at a frequency representative of visible light, will the chamber suddenly light up? If not, why?IH
  41. R

    Nature of Coil and magnet fields?

    I find it difficult to visualise how the magnetic field generated by a coil can be the same as the field of a permanent magnet. Are the magnetic fields the same or is it just that the effects are the same in that they both attract iron or magnets in the same fashion? Visualising the field...
  42. I

    Doubt in plotting Vector Fields

    Hi, I have a doubt in plotting the vector field. In the post https://www.physicsforums.com/showthread.php?t=155579 it is mentioned that a vector field could be plotted for F (x,y) by, marking the (x,y) as the tail and F(x,y) as the head portion. If so, then consider the function...
  43. pairofstrings

    Dynamic memory allocation and structure fields

    Please take a look at my program. Please help. I want to allocate memory dynamically for one field in structure. I tried to write the code but it has error. I posting a paint document for you to see. Help me please. Please tell me why is my code not working properly and what needs to be done...
  44. mishima

    Impossible electric fields examples?

    I was trying to think of more impossible electric fields than my book has. I understand it is anything that breaks the rule that the path integral is zero. One example is a circular field. I was trying to picture some more complicated 3d examples. Are all magnetic fields an impossible...
  45. B

    Gravitational Fields and Centripetal motion

    Just wondering if this statement is true, GMm/R^2=v^2/R
  46. S

    Abstract Algebra: Rings, Unit Elements, Fields

    1) Show that (R,*,+) is a ring, where (x*y)=x+y+2 and (x+y)=2xy+4x+4y+6. Find the set of unit elements for the second operation. I understand that the Ring Axioms is 1. (R,+) is an albein group. 2. Multiplication is associative and 3. Multiplication distributes. I just don't understand how to...
  47. D

    If light appears frozen due to time dilation, how do its fields fluctuate?

    I guess I have no problem with time dilation for stuff moving at less than c, but the step from less than to to c, is confusing me.
  48. S

    Electrostatic fields in vacuum

    Homework Statement An atom H has a charge +q (=proton) and -q(=electron). q = 1,6.10^-19. The electron is circeling around the proton at r distance r = 0,53.10^-10m. What is the force as a result of the electrostatic interaction between the proton and electron Homework Equations...
  49. M

    Analyzing Vector Fields: Determining Conservativeness

    Question: Which vector field is conservative? I added two pictures of the vector fields in the paint document. So far the only things I know about conservative vector fields are.. 1. Net change is 0 for a closed path 2.there is some function f such that F = ∇f (F being the conserv...
  50. M

    Electric fields in an Inductor

    En and Ec are the non-conservative and conservative electric field respectively. I've quoted this from the textbook I'm using (University Physics by Young and Freedman 12th edition). Now, it seems to me that the author just invoked the assumption that the inductor have negligible resistance...
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