What is Field concept: Definition and 15 Discussions

The visual field is the "spatial array of visual sensations available to observation in introspectionist psychological experiments". Or simply, visual field can be defined as the entire area that can be seen when an eye is fixed straight at a point.The equivalent concept for optical instruments and image sensors is the field of view (FOV).
In optometry, ophthalmology, and neurology, a visual field test is used to determine whether the visual field is affected by diseases that cause local scotoma or a more extensive loss of vision or a reduction in sensitivity (increase in threshold).

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  1. nomadreid

    I Infinite range of E-M field vs finite age of particles

    It is said (hopefully no need to give references for such a common statement) that the electromagnetic field of a given charged particle is infinite in range (albeit converging to zero as the distance goes to infinity). However, given that charged particles apparently did not exist at the...
  2. B

    B What is source of fundamental particle charge?

    Hello, Analogous to mass of fundamental (not composite) particles coming from interaction of those particles with the Higg's Field, does charge of fundamental particles come from interaction of those particles with some known/hypothesized fundamental field? Thank you!
  3. V

    B Understanding the Charge Field: Effects on Particle Path and Alteration in Space

    A charged particle is passed through a beam splitter and progresses down two divergent paths. How does the charge field document this? Does the field recognize both components? Only one? And once the field is detected, defining which path was taken, does the field alter it's nature through...
  4. B

    Physics of a chemical reaction: looking for textbook recs

    I'm currently doing a literature review on ultracold chemistry with an emphasis on collisional theory and quantum phenomena. I'm an undergraduate physics major, and I'd start my discussion of this topic by moving from basic Newtonian conservation laws and concepts like Coulomb repulsion to the...
  5. T

    Understanding Electric Fields and Work Done to Move Charges

    Homework Statement Hello. I am having trouble understanding this particular statement found in one of my textbooks. " Work done to move a charge along a line perpendicular to the field is zero" The Attempt at a Solution Field is a space around a charge where if we place any other charge...
  6. S

    If Faraday invented field concept, how did Newton find g?

    This is Newton's law of universal gravitation. $$F=G\frac{m_1.m_2}{r^2}$$ Gravitational field $$g$$ is derived from this formula $$g=G\frac{m_1}{r^2}$$ This is named gravitational "field" strength. If Newton knew nothing about "field concept" and formulated his formula in the form of "action...
  7. D

    Induced Electric Field Concept Question

    I am having a bit of trouble understanding something in my textbook and was wondering if you guys could help clarify. We just learned Faraday's Law that a time variant magnetic field will enduce an emf in a coil. What my textbook says is that " The electric field in the loop is NOT...
  8. T

    B and H field concept question (saturation)

    Hi there! I need some help in understanding the relationship between B and H fields and their "physical" meaning (helps me visualize problems). I'll try to be as clear as possible about my current knowledge and my questions: "Fields" do not exist, they are just a mathematical...
  9. TrickyDicky

    Understanding the Concept of Field in Physics: Definition and Relation to Waves

    I have been searching the web for a good explanation of the concept of field but I failed to find a good one. Could somebody provide me with a good definition of this important concept of physics? I'm specially interested in its relation with waves. Thanks.
  10. D

    Scalar Field Concept problem

    I've recently read about Null Identities of vector analysis. I'm having a problem in understanding what is it by "taking the curl of the grad of any scalar field is equal to zero." What is by definition of scalar field then? How would it looks like? Is position vector a scalar field? If No...
  11. P

    Electrostatic Field concept question

    Homework Statement A ping pong ball covered with a conducting graphite coating has a mass .005 kg and a charge -4 microC. What electric field will exactly balance the weight of the ball? Homework Equations qE = mg The Attempt at a Solution I know how to get the magnitude of the...
  12. F

    Dipole in an Uniform Electric Field concept?

    Homework Statement Dipole in an Uniform Electric Field: torque is calculated about the position of either charge has the magnitude FLsin(x) = qELsin(x) = pEsin(x). The direction of the torque vector is into the paper such that it tends to rotate the dipole moment vector p so it aligns with...
  13. W

    Dipole (electrical) and Electric Field Concept

    Hi all, I'm kind of confused right now about some concepts. - Dipoles are essentially point charges of the same magnitude but different signs that are a certain distance away from each other, right? -In my textbook, they were calculating a charged particle that is on the dipole axis...
  14. N

    Physics cannot be based on the field concept

    Can someone clarify the following quote? I consider it quite possible that physics cannot be based on the field concept, i.e., on continuous structures. In that case, nothing remains of my entire castle in the air, gravitation theory included, [and of] the rest of modern physics. (Albert...
  15. K

    Understanding Electric Fields and Potential in Parallel Plate Conductors

    If an electric field is due to 2 parallel plate conductors carrying equal and opposite charges, which plate got the higher potential, positive one or negative one? Electric potential = Q/(4*pi*ε*r) If charge, Q is negative, electric potential is negative, does it mean that the...