Analyzing the Force of Two Disk Magnets on a Metal Plate

[Kupa140]

The situation is as follows. We have two disk magnets. One is fixed on the ground, table, or surface and has the north pole facing up. Then we have a metal plate fixed on the vertical axis rod or something similar such that it can't move up or down, but only rotate horizontally with as less friction as possible. The metal piece is slightly above the surface of the first magnet and the magnet will obviously attract it.

We also have right above the first magnet and the needed space for the metal piece a fixed cylindrical tube holding the second identical magnet inside it, and it also allows the second magnet to slide up and down within the tube. The magnets are facing each other with the same poles, so north north. With nothing between the magnets, the second one would float above the first magnet with a given distance calculated by their repulsive force and so on.

Now to the question, the metal piece now rotates such that it's between the two magnets and the magnetic filed lines will now pass through the metal instead of air, the second one will fall lower than it's previous position and both will be attracted to the metal, would their force on the metal cancel each other out? If not, is their pull on the metal greater or lower than the necessary force needed to rotate the metal piece out of the position between them? My assumption is that a great deal is perpendicular on the metal and since the metal piece is fixed it should be less.

 

[Baluncore]

Welcome to PF.

The magnets are facing each other with the same poles, so north north.

There will be a plane of symmetry between the two north poles where there is no field. The two magnetic fields do not connect and flow through the two magnets, they bend out sideways and so avoid each other.

Now to the question, the metal piece now rotates such that it's between the two magnets and the magnetic filed lines will now pass through the metal instead of air, ...

There is no field halfway between the magnets where you place the metal plate.

 

[Kupa140]

Welcome to PF.There will be a plane of symmetry between the two north poles where there is no field. The two magnetic fields do not connect and flow through the two magnets, they bend out sideways and so avoid each other.There is no field halfway between the magnets where you place the metal plate.

It took me a while but now i understand, thank you.