Magnetic Forces in Vacuum: FAQs

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Discussion Overview

The discussion revolves around the nature of magnetic forces in a vacuum, specifically how magnets interact without a medium between them. Participants explore concepts related to magnetic fields, the role of vacuum, and the fundamental forces involved.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions how magnets can interact in a vacuum, suggesting that the absence of a medium raises concerns about the nature of their interaction.
  • Another participant asserts that the magnetic field exists in the space between the magnets, implying that the field is not dependent on the presence of air.
  • A different viewpoint emphasizes that the magnetic field is not carried by air, indicating that removing air does not affect the field's existence.
  • One participant proposes that the interaction is mediated by energy in the magnetic field, noting that fundamental forces do not require a medium to convey interactions.
  • Another participant introduces the concept of virtual photons as a means by which magnets "know" of each other's presence, highlighting that this interaction is limited by the speed of light.
  • A later reply clarifies that a vacuum can still contain electromagnetic fields and other forces, despite the absence of air.

Areas of Agreement / Disagreement

Participants express differing views on the nature of magnetic interactions in a vacuum, with no consensus reached on the underlying mechanisms or implications of these interactions.

Contextual Notes

Participants discuss the implications of vacuum and the nature of fields, but there are unresolved questions regarding the definitions of vacuum and the specifics of how forces operate without a medium.

mzntr
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Hello, sorry for bad english.

I have probably a very stupid question :)

Let's place two magnets in vacuum (empty space)
How does one magnet "know" of the other one, if there is "nothing" between them?
How "nothing" that exists between them can interact with magnets?
I know of course that there is a "field" between them, but if the field exist there is no more "nothing" there ?
 
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Yes, the field is contained in the space.
 
the magnetic field between magnets is not carried by or in the air between them, so why would it surprise you that removing the air would have no effect on the field?
 
The interaction is carried by the energy in the magnetic field...electromagnetic fields do not require particles to vibrate like,say, sound waves do.

In fact all four fundamental forces (strong, weak, electromagnetic, gravitational) do NOT require any intermediate entity, like air or particles...they produce their own particles...or waves...and these convey the energy of interaction.
 
Virtual photons can be postulated to convey how magnets "know" that other magnets exist. This knowledge cannot be acquired faster than the speed of light in vacuum, which is the speed that photons - virtual or not - travel. This has nothing to do with air, water, or any other medium between the magnets, so magnetic fields still exist even in a complete vacuum (whatever that really means).
 
Vacuum just means that there is no air (or as little air as physically possible). Vacuum's can still contain electromagnetic fields, gravitational fields, vacuum fluctuations.
 

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