Forces on magnets?
Christoph Kobe
I'm trying to find out if a magnetic field moves with a rotaing magnet or not (N-machine).
Therefor I need to know how a forces work on magnets. Let me explain:
If I lay a disc magnet on the table and put a wire with current over it, then a force will push the wire away (if I fix the magnet) or push the magnet away (if I fix the wire). Like this:
X >> <-Wire (current into the screen)
<< NNNNN <-Disc Magnet (north pole)
<< SSSSS <-Disc Magnet (south pole)
------------- <-Table (made of wood)
>> and << indicates the force.
This is pretty clear, most physics books explain this.
But what happens if I change the material of the table from wood to iron and at the same time allow the magnet to move on the table without friction? If I now fix the wire, what will move? The table? The magnet? both? How much force will work on the magnet and how much on the table?
Christoph