I Magnetism: Same Pole Repulsion & Heteropolar Attraction

Click For Summary
The discussion centers on the behavior of magnets in relation to Earth's magnetic field, particularly at the poles. Participants explore whether magnets experience same-pole repulsion and heteropolar attraction when positioned horizontally at the magnetic poles. The conversation highlights that the force between magnets is influenced by the gradient of the magnetic field rather than the field itself, with the Earth's magnetic field being relatively weak. It is noted that the forces involved are minimal, with calculations indicating that the attraction force can be as small as 12 nanoNewtons. Overall, the complexity of magnetic interactions and the nuances of magnetic force measurement are emphasized throughout the thread.
  • #31
renormalize said:
a negligible 12 nanoNewtons.
Confirm again, 12 nanonewtons is the attraction between the magnet and the earth's magnetic field?
A new question is added here, if the earth's magnetic induction increases by 10,000 times, find the attraction between the magnet and the earth's magnetic field at this time.
 
Physics news on Phys.org
  • #32
If nothing saturates ( probably true in this situation) then it will increase by ten thousand. We are assuming that you know how to turn up the Earth field.....an unlikely circumstance.
 
  • #33
This thread seems to have run its course, so it will be closed now.

Hir is correct that the magnetic force on a magnet is caused by the gradient of the magnetic field (its non-uniformity), and without a gradient you only get a torque (which is why compass needles align with the magnetic field).
 
  • Like
Likes BvU

Similar threads

I Questions related to magnetic shielding separating two like poles
  • · Replies 6 ·
Replies
6
Views
924
B Magnetic fields attracting two disc-shaped magnets
  • · Replies 11 ·
Replies
11
Views
2K
Magnetic attraction and repulsion equivalence
  • · Replies 8 ·
Replies
8
Views
12K
I How induction works within a coil (nuances of it)
  • · Replies 6 ·
Replies
6
Views
2K
I Geometry of Magnetic field lines as they approach a magnet pole?
  • · Replies 28 ·
Replies
28
Views
3K
Magnet's attraction force on a piece of iron
  • · Replies 1 ·
Replies
1
Views
2K
What Causes Attraction and Repulsion in Physics?
  • · Replies 4 ·
Replies
4
Views
2K
Simple experiment with magnets
  • · Replies 11 ·
Replies
11
Views
8K
Magnetic attraction / repulsion from the Lorentz force
  • · Replies 35 ·
2
Replies
35
Views
6K
Magnetism: Properties, Effects & Uses - 65 Chars
  • · Replies 5 ·
Replies
5
Views
1K