Are field lines from a magnetic dipole equal in magnitude?

Click For Summary

Discussion Overview

The discussion revolves around the characteristics of magnetic field lines from a magnetic dipole, specifically whether the magnetic field strength is equal in magnitude along these lines from the north to the south pole. The scope includes theoretical considerations of magnetic fields and their representation through field lines.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions if the magnetic field is equal in magnitude along a field line from the north end to the south end of a magnetic dipole.
  • Another participant asserts that the magnetic field strength is related to the density of field lines, implying that it varies.
  • A participant introduces a scenario involving a circular path drawn from the north to the south pole of a magnet, suggesting a consideration of symmetry.
  • It is noted that the approximation of the magnetic field as a pure dipole affects the uniformity of field strength, with some sources being better approximated than others.
  • Another participant reiterates the circular path idea but emphasizes that the strength of the magnetic field does not exhibit spherical symmetry and that radius alone does not determine field strength.

Areas of Agreement / Disagreement

Participants express differing views on the uniformity of magnetic field strength along field lines, with no consensus reached on whether the field strength is equal in magnitude throughout the path from the north to the south pole.

Contextual Notes

Participants highlight the dependence of magnetic field strength on the approximation of the magnetic source as a pure dipole and the lack of spherical symmetry in the field strength for magnets.

Luke Cohen
Messages
30
Reaction score
1
http://www.physics.sjsu.edu/becker/physics51/images/28_03_Earth_magnetic_field.jpg
If this is your magnetic dipole and you start at the north end and follow a field line to the south end, is the magnetic field equal in magnitude the entire way through?
 
Physics news on Phys.org
No. Magnetic field strength is more like the density of field lines.
 
What if you had a magnet and drew a circle from the north to the south pole. This circle had the same radius from the center of the magnet.
 
It depends on how closely the magnetic field is approximated as a pure dipole field.

In a pure dipole field, the field strength is equal in magnitude at points symmetric wrt the N and S poles.

Some magnetic sources are better approximated as pure dipoles than others.
 
Luke Cohen said:
What if you had a magnet and drew a circle from the north to the south pole. This circle had the same radius from the center of the magnet.
The strength of the field does not have spherical symmetry for a magnet.
The radius from the center is not enough to determine the value.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 28 ·
Replies
28
Views
3K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 22 ·
Replies
22
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 7 ·
Replies
7
Views
8K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 35 ·
2
Replies
35
Views
5K