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- A field is a single item of data1that can be entered, stored, or displayed213. A field can be a user interface element, such as a text box or a form field, that allows you to provide input using your keyboard or touchscreen2. A field can also be a data member or a member variable that is encapsulated within a class or an object in object-oriented programming3. Examples of fields are name, gender, hair color, address, or phone number13.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.A field is a single item of data within a database or software program. For example, a field may be a customer name, address, or phone number. Was this page useful?
www.computerhope.com/jargon/f/field.htmA field is a user interface element designed for entering data. Many software applications include text fields that allow you to provide input using your keyboard or touchscreen. Websites often include form fields, which you can use to enter and submit information. In software programs, the terms "field" and "text box" may be used interchangeably.
techterms.com/definition/fieldExamples of fields: name, gender, hair colour. In object-oriented programming, a field (also called data member or member variable) is a particular piece of data encapsulated within a class or object.en.wikipedia.org/wiki/Field_(computer_science) - People also ask
education - What is a field, really? - Physics Stack Exchange
133. I'm going to go with a programmer metaphor for you. The mathematics (including "A field is a function that returns a value for a point in space") are the interface: they define for you exactly what you can expect from this object. The "what is it, really, when you get right down to it" is the implementation. See more
You might have come across that the higher you climb (on Earth or somewhere else, but let's think of Earth) the colder the air gets, at an typical rate of about 6ºC per kilometer (it depends on various factors, but this is a ballpark value); in meteorology, this is … See more
When you put an electrically-charged tiny particle (test particle) near a metalic plate (for example) that has an electric charge itself (like the plate of … See more
The example above illustrates a scalar field: the value of the field at each space point takes a scalar value ("just a number"). Not all fields are scalar. An example is the velocity field, which represents the velocity (direction and magnitude!) of the air … See more
As a final note, I'll say the following; this question is more subject to discussion. Personally, I don't quite think about "touching" a field or it being "material"; I don't know how you're supposed to "touch" temperature. The field represents the set of values for a … See more
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What is actually a 'Field' in Physics? How can something affect ...
WebHere is a definition of a field in physics: In physics, a field is a physical quantity, typically a number or tensor, that has a value for each point in space and time.... As another example, an electric field can be thought of as a "condition in space" emanating from an electric charge and extending throughout the whole of space.
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definition - What is field? A form of matter or just a function of ...
WebMar 19, 2023 · A “field” is any physical quantity which takes on different values at different points in space (Feynman Lecture on Physics, Vol II, part 1-2) A physical entity that acts as mediator of force, conveying the force over the distance from one body to another. This entity is the field.
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What's the meaning of a field? - Physics Stack Exchange
WebFeb 14, 2016 · I'm familiar with the mathematical notion of field, and could for example understand a scalar field like the temperature as a function of position. But what in the world does $\phi(x)$ represent? And how do we turn it into something we can measure?
What are fields? - Physics Stack Exchange
WebFields are important in both classical and quantum physics. At first it was thought they are just some imaginary mapping of the forces of gravitation or electric and magnetic forces. Gradually it became clear one can not keep it away from physics.
How to define a field? - Physics Stack Exchange
WebA field is simple a function of space(-time) that assigns some value, vector or pretty much anything, to a certain point in space(-time). Nothing fancy really. A normal function like $f(x) = x^2$ can be viewed as a field that assigns a real value to the space $\mathbb R$.
Is there a difference between a field and a function?
WebApr 14, 2020 · The field ϕ ϕ is then a function. ϕ: M → S ϕ: M → S. where S S is a target-space. For example S =R S = R which would be a scalar field like temperature. Or S =R3 S = R 3 would be a vector field like the electric field. Usually a field ϕ ϕ should be at least two times differentiable. Share.
What does it mean for a field to be defined by a measure?
WebJan 25, 2023 · The Euclidean fields are defined by a probability measure $d\mu(\phi) = d\mu$ on the space of real distributions. Here $d\mu$ plays the same role as does the Feynman-Kac measure in quantum mechanics and they go on to introduce a generating functional $$S\{f\} = \int e^{i\phi(f)}d\mu\tag{6.1.4}$$ that is the inverse Fourier transform …
Do "fields" always combine by addition? - Physics Stack Exchange
WebFeb 27, 2019 · A field is a mathematical structure with addition/subtraction and multiplication/division. So yes every field (combines) additively at least internally. Two different fields aren't going to add unless you can define a mapping between the fields (see InertialObserver's answer).
field theory - Understanding the Functional Poisson Bracket
WebOct 1, 2020 · Understanding the Functional Poisson Bracket. In classical field theory (for a single field ψ ψ) the dynamical variables are defined to be functions of the fields ψ ψ, π π, ∂xiψ ∂ x i ψ and maybe r r, where π π is the conjugated field to ψ ψ.
What does it actually mean "to define a field" in QFT?
WebMar 31, 2017 · In QFT we have a field, so we need the functional dependency $\phi(x)$, and neither $x\mapsto \phi(x)$ nor $|\psi\rangle \mapsto \phi(x)|\psi\rangle$ are ever defined. In that sense I'm really confused. What does actually mean for physicists in the context of QFT to define a field? How can one work with operator-valued fields …
definition - Scalar fields and general coordinate transformations ...
WebYes, that is the definition of a scalar field in a theory with general covariance. $\phi^{\prime}(x^{\prime})=\phi(x)$ where $x^{\prime}$ is the coordinate in the new coordinate system corresponding to a given $x$ in the original coordinate system. i.e. $x$ and $x^{\prime}$ are, in general, different values representing the same point on the ...
What is an electric field? - Physics Stack Exchange
WebMay 31, 2019 · The EM field is a physical field created by electrically charged objects. It extends indefinitely through space. You are asking about the electric field but we talk about EM field, and the electric field and the magnetic field can be observer dependent.
Definition of a field line? - Physics Stack Exchange
WebAn electric field line is what's known as an integral curve of the field. Given an initial point, the field line is the unique curve that passes through that point and whose tangent is always parallel to the field. If it is not correct what path would a …
forces - Precise definition of electric field strength - Physics Stack ...
WebOct 28, 2022 · The correct definition of electric field strength is electric force per unit charge at a point, or $$E=F/q,$$ thus with units of $\mathrm{N/C}$. This is equivalent to the force that a 1C-charge would experience, but you are correct that although equivalent these two definitions are not identical.
general relativity - Why are Killing fields relevant in physics ...
WebDec 23, 2015 · For instance, any local quantum field theory has a stress-tensor operator $T_{\mu\nu}$ that is symmetric and conserved. Using Killing vector fields $\xi^\mu$ we can define conserved currents $$ j^\nu = \xi_\mu T^{\mu\nu} $$ This current then satisfies various Ward identities, etc.
How electric field lines are defined? - Physics Stack Exchange
WebMay 13, 2018 · The definition of an electric field line is a line whose direction at each point along it is the direction of the electric field vector at that point. With more than one point charge you have to find the vector sum of their fields at each point, in order to know the direction in which to continue the line.
particle physics - How does one define massive Higgs-ed gauge …
WebMay 8, 2021 · β ∝ 1/g2 β ∝ 1 / g 2 is the "stiffness" of the gauge field, where g g is the usual coupling constant. Small g g corresponds to weak coupling. λ λ is the coefficient of the term (|ϕ|2 − 1)2 ( | ϕ | 2 − 1) 2 in the action, so it controls the energy cost of having a Higgs field magnitude |ϕ| | ϕ | different than 1 1.
Is quantum field theory defined by its lattice regularization?
WebApr 23, 2017 · Specifically - the lattice is an algorithmic definition of those quantities that can be calculated in Euclidean spacetime. As I said in my answer to this question, this is a proper subset of all physical quantities you may be interested in calculating in general, and many physical situations do not have Euclidean formulation.
terminology - What is a mode? - Physics Stack Exchange
WebOct 13, 2015 · Ideally, answers should give an intuitive and easy-to-remember definition of what a mode is, preferably in a general context. If limitation is necessary for a detailed answer, assume a context of theoretical physics, e.g. mode expansions in …
How is computer science and physics related? [closed]
Web14. First off, physics tends to provide a very good background for people who move on to study problems in other areas, which is perhaps why there is a lot of cross-over to computer science. However, there are also a number of areas at the interface of computer science and physics which attract people from both sides: Computer hardware (which ...
quantum field theory - How is the term 'current' defined in QFT ...
WebDec 29, 2020 · Given any conserved $J_\mu$, we can define a new current $$ J'_\mu = J_\mu + \nabla^\nu K_{\mu\nu}\quad \text{where} \quad K_{\mu\nu} = - K_{\nu\mu}. $$ However, this new current does not correspond to a new symmetry as the charge is still the same $$ Q'[\Sigma] = \int_\Sigma n^\mu J'_\mu = Q[\Sigma] + \int_{\partial\Sigma} …
Definition of magnetic field - Physics Stack Exchange
WebAug 30, 2018 · Can we define magnetic field at a point as: Force on a point magnetic north pole at that point divided by its pole strength. Anything wrong in this definition? (The concept of point magnetic pole is an idealization as point magnetic poles don’t exist in nature and also there are no magnetic monopoles observed in nature.) Question edited:
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