What is a Field ? (Physics)

Magnetic fields, Electric fields, Gravitational fields... You have heard these words probably many times, but do you know exactly what is a field?

This video attempts to clarify this super important concept in Physics, all in just 4 minutes! There are two main categories of fields: Scalar fields and Vector Fields. This video discusses both.

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Credits:
_ The background drone music is by HumaHuma (Youtube’s music audio library).
_ The map of France is courtesy of Superbenjamin under a CC4.0 licence (The map has been modified by addition of arrows or numbers).
_ The water current map is courtesy of Fred the Oyster under a CC4.0 Licence (no modifications).

[MaaMeethecouple]

Omg, this concept gave me a headache when I tried to listen to the lecture of my professor. On another you explained this in an extremely easy way to understand. Thank you so much sir

[britishandamericanlightpia]

Gave up physics at age 14 and nearly 50 years later, it is great to catch up!

[jztxvlj]

You have a true gift for explaining these concepts🍎

[krutikthakor]

Thank you i needed this type of explanation of fields .

[santanudutta]

I think the essential truth of the matter is that after the emergence Quantum Mechanics and the Copenhagen interpretation, Physics has stopped caring about whether “it makes intuitive sense”, which means “can we relate it to our observed realities”, and is only interested in finding models, or mathematical recipes, that will accurately predict what we observe in expensive experiments. We still don’t understand WHY action at a distance exists, but can predict it with great accuracy across light years of intergalactic space and inside an atom. Even here we cannot even use the same recipe. I don’t know how many educated laymen, who often swear by Science, understand this situation. Science is a sound foundation for technology, because it’s recipes are very reliable, but still clueless about why it works the way it does.

[randomnobody]

That was a really great explanation! Now I finally understand fields. Thank you Sir!

[lorrainenye]

This is brilliant, i gave up at school, im 56 now this is fantastic, im learning about The law of one, this helps my understanding. Thankyou so much for this, excellent

[thelearner]

Really good explanation, thanks a lot!!

[ZeroPayonPC]

You might scoff at the idea of ​​the definition of "field", something that middle school kids learn. But in reality, many people don't understand what it is, they simply see the word in their books and they do their physics homework just fine, so why bother understanding its definition? So thank you sir, i really need this, i need to understand instead of reading the word.

[kisho]

in analogy to a space field, does a "time field" also exist?

[roman]

I've heard this question asked by professors to "prodigies" numerous times. The reason why I'm looking into "What is a field?" Is because each time I've heard this asked they always ask as if they're waiting for the "prodigy" to tell them something they don't already know.

[peretternavn]

Thank you for the good explanation. :) Appreciate it a lot

[adriangheorghe]

Campul fizic este starea dinamica speciala a spatiului din jurul surselor de miscare. Sursele de miscare pot fi sarcinile electrice Q sau sarcinile gravifice=masele gravifice Mg. Aceste sarcini se calculeaza cu formula lui Gauss care face integrarea efectului fizic produs in spatiu de sursa de miscare, pe suprafata inchisa din jurul sursei. Starea dinamica a spatiului din jurul surselor dovedeste interactiunea structurilor dinamice din adancul substantei, cu spatiul fizic, materializat de materia inponderala, neinertiala, necoeziva si inelestica. Daca efectul fizic produs in jurul surselor, de ambele tipuri si gravifica si electrica, este acceleratia, integrarea efectului fizic pe suprafata inchisa, duce la concluzia ca masa gravifica Mg si sarcina electrica Q au aceleasi dimensiuni fizice si anume:

The physical field is the special dynamic state of the space around the sources of motion. The sources of movement can be electric charges Q or gravitational charges = gravitational masses Mg. These loads are calculated with Gauss's formula which integrates the physical effect produced in space by the source of motion, on the closed surface around the source. The dynamic state of the space around the sources proves the interaction of the dynamic structures deep in the substance, with the physical space, materialized by weightless, non-inertial, non-cohesive and inelastic matter. If the physical effect produced around the sources, both gravitational and electric, is acceleration, the integration of the physical effect on the closed surface leads to the conclusion that the gravitational mass Mg and the electric charge Q have the same physical dimensions, namely: [Mg]=[Q ]=a.S=(l/T^2).L^2=L^3/T^2.

[myopicseer]

Plotting physical characteristics over 3-d space, or along the surface of a 2-d area is a "field"? When I think of a magnetic 'field', I am puzzled by this idea about what is the 'field' composed of? What is organizing over the space between a N and S pole magnet that causes the magnetic field? To say you can read the field with a gauss meter at various points so that you can tell us the strength and shape of the field answers nothing about the material changes and particles that are responsible for manifesting the field. To describe any particular field, we would want to know how is it conveyed through space. What material parts are responsible for the field?

[vivek]

Please explain more about electric field why it is vector.

[TheBebuchis]

Very helpful video. From my understanding a field is just a subject's range of qualities that can exist?

[VidunJayasinghe]

What does the two units coloumb and amphere mean

[donwilson]

“Region of space “ sounds all good and dandy.. But I’m looking for what is the content of the field that composes our atomic world, quantum world, or similar system that is the back drop for reality

[kisho]

so a manifold ("surface") that has a "hole" is not a field?

[zakirhussain-jsku]

All fields other than electric, magnetic and gravitational field mentioned in the video are produced by particles. Are electric, magnetic and gravitational fields also produces by some kind of particles?