- #1

Guineafowl

- 767

- 368

- TL;DR Summary
- I’m trying to find a way to model the magnetic field between repelling magnets, and how that changes when the permeability of the gap changes.

Following a conversation with @Tom.G , I’ve come up with the following question, to which we’d both like an answer:

Imagine two drilled magnets threaded onto a frictionless upright shaft, set N-N. One fixed down, the other floating above.

Now, if I move an iron gate in and out of the gap (the shaft has a gap), the upper magnet will move down and up.

How would you express the force exerted on the iron gate by the magnets, on the in and out strokes?

For a start, I can’t find an expression for the force between repelling magnets. Is there one?

Imagine two drilled magnets threaded onto a frictionless upright shaft, set N-N. One fixed down, the other floating above.

Now, if I move an iron gate in and out of the gap (the shaft has a gap), the upper magnet will move down and up.

How would you express the force exerted on the iron gate by the magnets, on the in and out strokes?

For a start, I can’t find an expression for the force between repelling magnets. Is there one?