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. G

    Are the Fresnel coefficients equal for E and B fields?

    From the Maxwell Equations we know that there are four boundary conditions for an electromagnetic wave crossing an interface between two dielectric media. For the TE polarisation state, these conditions give us that E_{i} + E_{r} = E_{t} B_{i}\,\cos\theta_{i} - B_{r}\,\cos\theta_{r} =...
  2. M

    B How does time behave in overlapping gravitational fields?

    That is to say, how does time behave in a region of space where multiple gravitational fields cancel out their accelerating effects? I understand that time "slows down" in a gravitational field, but does this depend on the actual presence of the field, or instead the actual net acceleration...
  3. N

    Mathematical problem in electrial/magnetic fields

    Homework Statement A charged particle moves in a region of space where there is a uniform magnetic field B (in the z direction say,) and a uniform electric field E in the yz plane. Write the equations of motion for the particle. Then solve them, taking for initial conditions (at t=0) x=y=z=0...
  4. V

    Physics Currently what are the most in-demand fields in Physics?

    Hi. I am currently an undergrad following a physics major, and I am in the final year of my course.I am planning to continue on with grad studies and wants to know the most demanding(subject wise and salary wise) paths in physics.(Ex: astrophysics,astronomy,condensed matter physics,medical...
  5. M

    How can i measure high magnetic fields?

    Hello! I've made a lot of research about measurement of high magnetic fields - such us 1T - 2T and I can't find sensors for this range. I'm looking for a hall sensor with which I will be able to measure 1T magnetic field with good accuracy - about 0.1 mT. Do you know about anything like that...
  6. Hawksteinman

    I Questions about planetary magnetic fields

    1. Why is Earth's South Pole called its North Pole? Why hasn't it been changed to make it more scientifically accurate? 2. Why are the North Poles of other planets defined relative to Earth's 'North' Pole? Why isn't it based upon the actual direction of the planet's magnetic field?
  7. A

    How exactly do motors and generators work by using magnetic fields?

    So I know if you move a charge in a magnetic field it induces voltage and hence a flow of charge is created which is current. ( Please correct me if I'm wrong). But that's pretty basic right. However, I'm having trouble understanding the use of split rings in the functioning of a motor. I would...
  8. SJay16

    Courses Which fields of physics are good to specialize in?

    Over the next decade, and few decades, which branches/ fields of physics will experience tremendous growth? I'm wondering what field I'd want to "specialize in" or focus in and could use some of your guy's opinion.
  9. S

    What is the effect of electromagnetic fields on the Earth's

    What is the effect of electromagnetic fields on the Earth's magnetic field? Electric energy in the transmission and use of the process, will produce electromagnetic field, the electromagnetic field will have an impact on the Earth's magnetic field? I think it is possible to cause the...
  10. E

    Peak amplitudes of E and H fields (Poynting Vector)

    Homework Statement What are the associated peak amplitudes of the E and H fields if sunlight has a maximum intensity of 1400 W/m2 on the earth’s moon? Homework Equations I = <s> = 1/2 c ε0E2The Attempt at a Solution I = <s> = 1/2 c ε0E02 1400 = (1/2)(3*108)(8.85*10-12)(E02) 1400 /...
  11. C

    Lateral electric fields in a lateral electrostatic actuator

    Hello, I'm reading through section 6.2.2 of https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-013-electromagnetics-and-applications-spring-2009/readings/MIT6_013S09_chap06.pdf on page 157. I understand all the math, but I have a conceptual questions that I don't seem to...
  12. K

    I Do additional Higgs fields also impart mass?

    in theories such as SUSY and MSSM where there are 5 Higgs fields, do the other higgs fields also impart mass? and how exactly is it determined which of the additional higgs fields impart mass on which particles? do the other higgs field impart mass on other higgs bosons? wouldn't there be...
  13. PrathameshR

    Mathematical methods for students of physics and related fields

    This book is too expensive for me to buy. Can someone share ebook/ pdf?
  14. physea

    Can magnetic fields have any geometry we want?

    Is it possible to have a magnetic field of a any geometry we want, or there are only few types of geometries that can be achieved with permanent magnets and electromagnets? If the former, how do we produce a magnetic field of specific geometry? For example, can the magnetic field be cylindrical...
  15. C

    Motion of Charged Particles in Electric Fields

    Homework Statement This is the question: An electron at rest of mass 9.11 × 10−31 kg is accelerated through a potential difference of 350 V. It then enters some deflecting plates of 50 V with dimensions as shown. Calculate the distance x (deflection of the electron) (Charge on an electron is...
  16. A

    Draw field lines for both magnetic fields

    Homework Statement Homework Equations N/A The Attempt at a Solution Im not sure if I've done this right because it seems too little for 6 marks. I have arrows coming from the north to the south end for the magnet's magnetic field. I have arrows going counter clockwise around the conductor...
  17. topolosaurus

    I Covariance of Euler-Lagrange equations for fields

    \newcommand{\dep}[1]{\partial_{#1}} \newcommand{\parcial}[2]{\frac{\partial{#1}}{\partial{#2}}} \renewcommand{\d}{\text{d}} \newcommand{\ddt}{\frac{\text{d}}{\text{d}t}} \newcommand{\ppartial}[3]{\frac{\partial^2{#1}}{\partial{#2}\partial{#2}}} I haven't found this problem solved around maybe...
  18. hideelo

    I SO(2n) representation on n complex fields

    If I have a lagrangian which has terms of the form ##\Psi^{\dagger}_\mu \Psi^\mu## then I can decompose the n complex ##\Psi## fields into 2n real fields by ##\Psi_\mu = \eta_{2\mu+1} + i\eta_{2\mu}##. When I look at the lagrangian now it seems to have SO(2n) symmetry from mixing the 2n real...
  19. C

    A Question about derivatives of complex fields

    https://arxiv.org/pdf/1705.07188.pdf Equation 5 in this paper states that $$\frac{\partial F}{\partial p_i} = 2Re\left\lbrace\frac{\partial F}{\partial x}\frac{\partial x}{\partial p_i}\right\rbrace$$ Here, p_i stands for the i'th element of a vector of 'design parameters' \mathbf{p}. These...
  20. binbagsss

    Lie derivative vector fields, show the Leibniz rule holds

    Homework Statement Homework Equations ##V=V^u \partial_u ## I am a bit confused with the notation used for the Lie Derivative of a vector field written as the commutator expression: Not using the commutator expression I have: ## (L_vU)^u = V^u \partial_u U^v - U^u\partial_u V^v## (1)...
  21. binbagsss

    Wick theorem proof 4 point correlator 2 different fields

    1. Homework Statement Attached: Homework Equations I've just changed the notation a tad to make things quicker for me : ##\phi_1=\phi_1(x_1)## and ##\Phi_2=\phi_2(x_2)## : denotes normal product. i.e annhilator operators are on the RHS, so acting on a vacuum state will give zero. I can...
  22. G

    Electric Fields and Electric Potential

    Homework Statement An Electron enters a parallel plate apparatus that is 8cm long and 4cm wide. The electron has a horizontal speed of 6*10^7 m/s. The potential difference between the plates is 6*10^2 V. Calculate the electrons velocity as it leaves the plates. (ans. 6*10^7 m/s [E 3.3° N])...
  23. B

    How Does Gauss' Law Apply to Currents in Electric Fields and Circuitry?

    I am designing a device, which will utilize an electric field. The question I have run into is whether or not the current is treated as the charge enclosed for Gauss' Law, or if there's another way I would calculate it. Also, am I correct that the voltage of the circuit would be different than...
  24. B

    Electric Potential and Electric fields

    Homework Statement Can there be a point in space where there is an electric potential but not electric field? Can there be a point in space where there is an electric field but no electric potential? Explain you answer. What would the electric field lines look like if the electric field was...
  25. J

    Lenz's Law and Induced Magnetic Fields

    In a transformer, the primary coil has a current running through it which creates a magnetic field. Then this field induces a current in the secondary coil. That induced current creates a magnetic field exactly opposite the inducing magnetic field. This might be an obvious question, but that...
  26. hilbert2

    A Scalar Fields with the Same Mass

    In the Peskin&Schröder's QFT book there's an exercise that's about a pair of scalar fields, ##\phi_1## and ##\phi_2##, having the field equations ##\left(\partial^{\mu}\partial_{\mu}+m^2 \right)\phi_1 = 0## ##\left(\partial^{\mu}\partial_{\mu}+m^2 \right)\phi_2 = 0## where the mass parameter...
  27. binbagsss

    Proof of Wick's Theorem for 3 fields

    Homework Statement Question attached: Homework Equations [/B] Using the result from two fields that ## T(\phi(x) \phi(y))= : \phi(x) \phi(y) : + G(x-y)## Where ##G(x-y) = [\phi(x)^+,\phi(y)^-] ## ## : ## denotes normal ordered and ##\phi(x)^+ ## is the annihilation operator part , and...
  28. S

    Testing Which fields in physics are nearly saturated?

    I'm having trouble choosing my advanced papers. So I want to know which fields are saturated and which are the hot ones right now.
  29. FallenApple

    I Are QFT fields the medium for light?

    It is said that light needs no medium. But light is just an excitation of the electromagnetic field in QFT. This excitation presumably propagates within that field at the speed c and once that excitation has left a point in space, the field has settled down to 0 energy again, analogous to pond...
  30. T

    Electric and Magnetic Fields: A Proton's Motion

    Homework Statement A proton moves with constant velocity in a certain region of gravity-free space.Which one of the following conclusions is valid? A)There must be no electric field or magnetic fields in the region. B)There could be an electric field without any magnetic field. C)There could be...
  31. Buckethead

    B Faraday's disk and "absolute" magnetic fields

    I've posted this here because I think it might be related to the absoluteness of acceleration and rotation. I've been educating myself on the Faraday Disk and was very surprised by one aspect of it. If we have a solid metal disk mounted on a shaft with two electrical brushes contacting the...
  32. Math Amateur

    MHB Splitting Fields: Anderson and Feil, Theorem 45.6 ....

    I am reading Anderson and Feil - A First Course in Abstract Algebra. I am currently focused on Ch. 45: The Splitting Field ... ... I need some help with an aspect of the proof of Theorem 45.6 ... Theorem 45.6 and its proof read as follows: https://www.physicsforums.com/attachments/6701At...
  33. Math Amateur

    I Splitting Fields: Anderson and Feil, Theorem 45.6 ....

    I am reading Anderson and Feil - A First Course in Abstract Algebra. I am currently focused on Ch. 45: The Splitting Field ... ... I need some help with an aspect of the proof of Theorem 45.6 ... Theorem 45.6 and its proof read as follows: At the start of the proof of Theorem 45.6 we read...
  34. Math Amateur

    MHB Splitting Fields: Anderson and Feil, Theorem 45.5

    I am reading Anderson and Feil - A First Course in Abstract Algebra. I am currently focused on Ch. 45: The Splitting Field ... ... I need some help with some aspects of the proof of Theorem 45.5 ... Theorem 45.5 and its proof read as follows: In the above text from Anderson and Feil we...
  35. Math Amateur

    I Splitting Fields: Anderson and Feil, Theorem 45.5 ....

    I am reading Anderson and Feil - A First Course in Abstract Algebra. I am currently focused on Ch. 45: The Splitting Field ... ... I need some help with some aspects of the proof of Theorem 45.5 ... Theorem 45.5 and its proof read as follows: In the above text from Anderson and Feil we...
  36. Astronaut

    Magnetic Forces on objects in nonuniform fields

    I have this question which I need to solve . But I am unable to. Suppose I have a current ring of radius R and current I (constant). at a distance x from the centre of the ring, I have a iron disk (radius r and thickness t) present in the plane of the ring. This disk will be attracted to the...
  37. Math Amateur

    MHB Splitting Fields: Anderson and Feil, Theorem 45.4

    I am reading Anderson and Feil - A First Course in Abstract Algebra. I am currently focused on Ch. 45: The Splitting Field ... ... I need some help with some aspects of the proof of Theorem 45.4 ... Theorem 45.4 and its proof read as follows: My questions on the above proof are as...
  38. Math Amateur

    I Splitting Fields: Anderson and Feil, Theorem 45.4 ....

    I am reading Anderson and Feil - A First Course in Abstract Algebra. I am currently focused on Ch. 45: The Splitting Field ... ... I need some help with some aspects of the proof of Theorem 45.4 ... Theorem 45.4 and its proof read as follows: My questions on the above proof are as...
  39. Math Amateur

    MHB Existence and Uniqeness of Finite Fields .... Example from D&F ....

    I am reading David S. Dummit and Richard M. Foote : Abstract Algebra ... I am trying to understand the example on Finite Fields in Section 13.5 Separable and Inseparable Extensions ...The example reads as follows: My questions are as follows: Question 1In the above text from D&F we read the...
  40. Math Amateur

    I Existence and Uniqeness of Finite Fields ....

    I am reading David S. Dummit and Richard M. Foote : Abstract Algebra ... I am trying to understand the example on Finite Fields in Section 13.5 Separable and Inseparable Extensions ...The example reads as follows: My questions are as follows: Question 1In the above text from D&F we read the...
  41. ExplosivePete

    Discontinuous electric fields

    Griffiths introduction to electrodynamics talks about how electric potential is always continuous and electric fields are continuous except in the case of a surface charge density. This seems fair assuming you can have a continuous surface charge Density, but in the real world, these densities...
  42. Math Amateur

    MHB Splitting Fields and Separable Polynomials ....

    I am reading both David S. Dummit and Richard M. Foote : Abstract Algebra and Paul E. Bland's book: The Basics of Abstract Algebra ... ... I am trying to understand separable polynomials ... ... but D&F and Bland seem to define them slightly differently and interpret the application of the...
  43. Math Amateur

    I Splitting Fields and Separable Polynomials ....

    I am reading both David S. Dummit and Richard M. Foote : Abstract Algebra and Paul E. Bland's book: The Basics of Abstract Algebra ... ... I am trying to understand separable polynomials ... ... but D&F and Bland seem to define them slightly differently and interpret the application of the...
  44. 9

    Total moment density of electromagnetic fields

    Homework Statement These is a problem from my textbook. You have an infinite solenoid with n turns per unit longitude, radius "a" and a stationary current I. In the axis there exits a uniform line charge with lineal density λ. Compute total electromagnetic momentum (lineal and angular)...
  45. Math Amateur

    MHB Confirm/Critique Solution to Dummit and Foote, Section 13.2: Exercise 2

    I am unsure of my approach to Exercise 2 Dummit and Foote, Section 13.2 : Algebraic Extensions .. I am therefore posting my solution to the part of the exercise dealing with the polynomial g(x) = x^2 + x + 1 and the field F = \mathbb{F}_2 ... ... Can someone please confirm my solution is...
  46. S

    I Understanding Lorentz Transformation on Scalar Fields

    Hello! Can someone explain to me how does a scalar field changes under a Lorentz transformation? I found different notations in different places and I am a bit confused. Thank you!
  47. Math Amateur

    MHB Splitting Fields - Example 3 - D&F Section 13.4, pages 537 - 538

    I am reading Dummit and Foote, Chapter 13 - Field Theory. I am currently studying Section 13.4 : Splitting Fields and Algebraic Closures ... ... I need some help with an aspect of Example 3 of Section 13.4 ... ... Example 3 reads as follows: In the above text by Dummit and Foote, we read...
  48. Math Amateur

    I Splitting Fields - Example 3 - D&F Section 13.4, pages 537 -

    I am reading Dummit and Foote, Chapter 13 - Field Theory. I am currently studying Section 13.4 : Splitting Fields and Algebraic Closures ... ... I need some help with an aspect of Example 3 of Section 13.4 ... ... Example 3 reads as follows: In the above text by Dummit and Foote, we read...
  49. atommo

    Electron Spin and current-induced magnetic fields

    Hi, I'm currently investigating magnetic fields/their cause. This has inevitably led me to learn all about electrons. Here I want to post my understanding on electron 'spin' so people can correct me if I'm wrong/help others get a better understanding. So I watched this YouTube video for...
  50. B

    Jackson, Problem 5.2 (b); solenoid currents and fields

    Homework Statement Homework EquationsThe Attempt at a Solution These are problem 5.1 (b) and the solution. I understood the gap between each loop is 1/N, but why does each loop have vertical direction current amount of I/N ?? [/B]
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