Magnet question

[elecar]

As you bring 2 opposing magnets together, you need more force to close the gap.
Is there a simple way to determine how much force they require at each point.
I assume if they were 10mm apart to begin with and you moved them closer by 5 mm it would not be a simple case of doubling the force that was required at 10mm, or perhaps it is that simple ?

[Low-Q]

As you bring 2 opposing magnets together, you need more force to close the gap.
Is there a simple way to determine how much force they require at each point.
I assume if they were 10mm apart to begin with and you moved them closer by 5 mm it would not be a simple case of doubling the force that was required at 10mm, or perhaps it is that simple ?

In general it takes greater force to push the magnets together the narrower the distance is. The force is related to the distance between the center of magnetism. Of you have two disc magnets 50mm in diameter and 1mm thick, it takes much more force to bring them together surface to surface, than edge to edge. Even the magnets are the same. The reason is that the center of magnetism is much closer surface to surface (1mm apart), than edge to edge (50mm apart).


The relationship is square to the distance - just like gravity.




Vidar

[gyulasun]

You can use on-line repel force calculators if you search for it.

Here is one at random search: http://www.kjmagnetics.com/calculator.repel.asp

[elecar]

Thank you, that helps a lot, I did try to find  some kind of calculator but was obviously using the wrong terms.

[ace569er]

   I'm still waiting for someone to tell me or even guess. How to counter/calibrate/weaken the push/pull of magnetization/magnetism? It can be done. Also no form of NUMetal is used. There is a arrangement that everyone knows, that simulates a monopole effect. Meaning it uses the north or south magnetization only when arranged this way. Now can some one tell me how to ADD to that array, to counter, calibrate, & weaken the simulated monopole effect? So that the gate/sticky point, is weakened to almost weakness of the driving force, instead of being several times stronger? Clue; you can not cancel it out, only weaken it. Also you do not change the distance, because that will always take more energy to do so then the drive of the arrangement could ever produce. Then if you can guess that, then tell me what last mod is needed to push pass the weakened gate.
    I do want to explain so bad, but it is so simple of a layout. Plus even easier to see why it works when you can see it then do the math for why it does it. That it saddens me no one has even tried to do something, or figure out how one can  counter/calibrate/weaken the gate in itself, without adding any energy at all. Everyone always wants to move something. Needing work to do so. Yet there is a different way to calibrate. First weaken the gate, then use multiple dynamics to overcome it. So I'd like to see some GOOD thought experiments to figure it out. Can anyone guess how? Think simple. Though I guess every arrangement we use today, is so simple yet, took man till recently to figure out...