Why would a magnetic monopol's field be 1/r^2?

Click For Summary

Discussion Overview

The discussion centers around the hypothetical existence of magnetic monopoles and the implications for their magnetic fields, particularly the assertion that such fields would decrease in magnitude as 1/r², similar to electric charges. Participants explore the symmetry in Maxwell's equations and the consequences of different field behaviors.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant references Purcell's Electricity and Magnetism, questioning why a magnetic monopole's field would behave like an electric charge's field, specifically decreasing as 1/r².
  • Another participant suggests that the existence of magnetic monopoles would enhance the symmetry of Maxwell's equations, implying that if they did not behave like electric monopoles, it would create asymmetry.
  • A participant seeks clarification on whether the absence of a 1/r² behavior for a magnetic monopole would lead to contradictions in Maxwell's equations, particularly regarding the divergence of the magnetic field.
  • One participant argues that the idea of a magnetic monopole behaving differently than 1/r² is not widely considered and would contradict the goal of achieving symmetry in Maxwell's equations.

Areas of Agreement / Disagreement

Participants express differing views on the implications of magnetic monopoles for Maxwell's equations. There is no consensus on whether a magnetic monopole could exist with a field behavior other than 1/r², and the discussion remains unresolved regarding the consequences of such a scenario.

Contextual Notes

Participants acknowledge the limitation of the discussion to the symmetry of Maxwell's equations and the implications of magnetic monopoles, without resolving the specific mathematical consequences of alternative field behaviors.

Yonah
Messages
3
Reaction score
0
Hi,
I was reading Purcell's Electricity and Magnetism. It says that if there were a magnetic charge, its field would behave like an electric charge (field pointing out radially and magnitude decreasing as 1/r^2). Why? Could this be deduced from magnetic fields produced by electric charges? If so, how?

I'd appreciate your help!
 
Physics news on Phys.org
The only reason to think that magnetic monopoles exist is because it would make things like Maxwells equations more symmetrical. If they didn't behave like an electric monopole then that would make the equations asymmetrical, which would defeat the whole point.
 
Ok, so you are saying that there would be no contradiction among maxwell's equations necesarily (except of course ∇⋅B=0) if a magnetic monopol existed which decreased in a way other than 1/r^2. Things just wouldn't be symetrical in that case. Is that correct?
 
If the ##\vec B## field from a magnetic monopole did not go like ##1/r^2##, what would replace ##\vec \nabla \cdot \vec B = 0## and its integral equivalent ##\oint {\vec B \cdot d \vec a } = 0##?
 
Yonah said:
Ok, so you are saying that there would be no contradiction among maxwell's equations necesarily (except of course ∇⋅B=0) if a magnetic monopol existed which decreased in a way other than 1/r^2. Things just wouldn't be symetrical in that case. Is that correct?
No, that isn't what I am saying. I am saying that to my knowledge nobody even considers that. The idea is to make Maxwell's equations more symmetrical, not less. I don't know how a change like the one you describe could wind up with a set of equations even remotely similar to Maxwells equations. It would be the complete opposite of what monopole proponents want to accomplish.
 
Ok, I think I understand what your getting at. Thanks!
 

Similar threads

  • · Replies 21 ·
Replies
21
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 16 ·
Replies
16
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
978
  • · Replies 20 ·
Replies
20
Views
5K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K