Can Electromagnetic Fields Reach Infinite Strength or Range?

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Discussion Overview

The discussion revolves around the nature and limits of electromagnetic fields, specifically addressing questions about their maximum range and strength, the differences between electric and magnetic fields, and the possibility of creating fields strong enough to prevent light from escaping. The scope includes theoretical considerations and speculative ideas related to physics.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that the range of an electromagnetic field is not strictly limited, but practical considerations, such as the speed of propagation and the diminishing strength of fields, impose effective limits.
  • There is a viewpoint that the maximum strength of an electromagnetic field is likely constrained by the energy content of the visible universe, though this is not universally agreed upon.
  • One participant raises the question of whether electric and magnetic fields have different maximum strengths, indicating that this may depend on the frame of reference.
  • There is speculation about the possibility of creating fields so strong that they could prevent light from escaping, with references to general relativity supporting this idea.
  • Another participant introduces the concept of a "magnetic black hole," questioning the limits of magnetic field strength and its implications for fundamental particles like protons and electrons.
  • The interaction of electromagnetic waves and the potential for interference effects are discussed, emphasizing that strength alone may not determine whether light can escape a field.
  • There are considerations about the behavior of charged particles in strong fields, including the potential for heating and dynamic movement akin to auroras on Earth.

Areas of Agreement / Disagreement

Participants express a range of views on the questions posed, with no clear consensus on the maximum strength or range of electromagnetic fields. The discussion remains open-ended, with multiple competing ideas and hypotheses presented.

Contextual Notes

Participants acknowledge that the behavior of electromagnetic fields may depend on various assumptions and definitions, and there are unresolved questions about the implications of extreme field strengths on fundamental particles.

Constructe
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Four interesting questions:

1: Is there a maximum range of a given electromagnetic field?

2: Is there a maximum strength of an electromagnetic field?

3: If the maximum electric field or magnetic field different from each other?

4: Can you make an electric or magnetic field so strong or localized that light can't escape?
 
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1) Not really, but it depends what you mean by range. Any small perturbation to the field must have time to propagate (it moves at speed c in vacuum). There is of course the size of the visible universe which is sort of the maximum distance observers here on Earth can see, and I guess that would be a practical limit. So I mean there's nothing stopping you from having a universe sized black hole or something with a huge EM field everywhere *in principle*. In practise fields tend to die off like R^2, so physically we tend to think that say a battery on Earth won't really affect Mars (even though the correct answer will be some obscene decimal place).

2) No, though again probably on the order of the energy content of the visible universe for practical purposes.

3) Frame dependent question.

4) Yes according to GR.
 
Thanks for your input. Given its strengh dies off quite dramatically, I guess those beings on alpha centauri don't care what I do with a bar magnet, lol.

I was thinking can magnetic fields get so strong they can squish protons and electrons out of existence? If not, maybe that's the strongest they can get because unless the bosons carry the load what will the source of the charge. Anyway, hmmm maybe we can be the first to hypotesize a magnetic black hole ^^.
 
Constructe said:
4: Can you make an electric or magnetic field so strong or localized that light can't escape?
Light is an electromagnetic wave, so other electromagnetic waves can effect each other in the same way that waves on a pond effect one another: by constructively or destructively interfering with each other. Being 'strong' is not the main point.
 
Oh you have a good point there, depending on the angle and how light it bent it may cause inference or affect it in other ways so as not to get swallowed up by an magnetic force of ridiculously high strength, although I suppose particles wouldn't be too fortunate unless they find a way to exhibit wave-like aspects as well. Maybe a lot of charged particles may heat up to super high temps and dance around the poles like a hyper version of aurora's on earth.
 

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