What's wrong with this diagram of magnetic field lines?

Click For Summary
SUMMARY

The discussion centers on the inaccuracies of a diagram depicting magnetic field lines in a book titled "Magnetism and its effects on the living system" by Davis & Rawls, first published in 1974. Participants agree that the classical representation of field lines exiting the north pole and entering the south pole is misleading, as it fails to accurately depict the inhomogeneous nature of magnetic fields. The consensus is that the book correctly identifies these misconceptions, despite the confusion surrounding its presentation. Maxwell's Equations are referenced as a more accurate framework for understanding magnetic fields.

PREREQUISITES
  • Understanding of magnetic field concepts
  • Familiarity with Maxwell's Equations
  • Knowledge of field line representation in magnetism
  • Ability to analyze diagrams and identify inaccuracies
NEXT STEPS
  • Study Maxwell's Equations for a comprehensive understanding of electromagnetic fields
  • Research the historical context of magnetism literature, focusing on works published in the 1970s
  • Examine various representations of magnetic field lines using physical experiments, such as iron filings
  • Explore modern textbooks on electromagnetism for updated theories and diagrams
USEFUL FOR

Physics students, educators, and anyone interested in the accurate representation of magnetic fields and the historical evolution of magnetism concepts.

  • #31
If there ever is a poster child on why you should never show bit and snippets of something and hope to get a rational discussion on it, this thread will be it!

This has been a complete waste of time.

Zz.
 
Physics news on Phys.org
  • #32
http://www.theoldscientist.co.uk/Documents/Books/Magnetism-and-Its-Effects-on-the-Living-System-by-Roy-Davis-and-Rawls.pdf here is the link to the book online go and check it out I strongly suggest to everyone.

The book is pure crap.BEWARE

@magnetics , I hope you do realize that this book is wrong , have you been reading it a lot? If you have some messed up things in your head feel free to ask them here so that we can try to clear this up.
 
Last edited by a moderator:
  • #33
Reading their rationale they also say that...
"a magnet has a magnetic equator and it is at this point where the spins of electrons change their phase relationship and present us two fields of energies and two different potentials of magnetic energy."
They say the magnetic energy leaves the S pole spinning to the right and dips to the centre (equator) of the magnet, then leaves the same location and spins to the left entering the N pole.
This is as shown on the first diagram I attached.
Supposedly (the authors say), the reason why field lines as shown by iron filings are misleading is because each iron filing becomes it's own magnet in the presence of the magnetic field.
 
  • #34
iron and other ferromagnetic metals do become magnetized in the presence of a magnetic field but it has nothing to do with what the authors are talking about.

It's just that metals are good conductors , both electrical and magnetic, well not all of them but most are.

@ Zapper, yeah you can sure put this thread in history for how NOT to make a reference to something.

But honestly i don't blame the OP because a book like this one can be confusing as hell, so if your not prepared for what you read you can get yourself into a lot of trouble , I have had my expierence in this one too , thank god I realized and turned around to throw out the crap I was once presented from a few guys who were trying to make a Nobel prize ... :D
 
Last edited:
  • #35
Here is the page in the middle, sorry for the confusion... :confused:
 

Attachments

  • #36
Just forget about it , two guys tried to make history with some crazy absurd ideas , many have tried many have failed , just read up on magnets on wikipedia , not a perfect source but definitely 100% more reliable than this book.
or get a nice approved decent book about the topic and read that one and ask questions , feel free.
 

Similar threads

  • · Replies 28 ·
Replies
28
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
Replies
14
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 7 ·
Replies
7
Views
13K
Replies
1
Views
1K
Replies
3
Views
1K