- #1
User11037
- 8
- 0
Hi,
With permanent magnets I have been puzzling over how they can obey the conservation of energy.
If I make a permanent magnet then I can use it, expending negligible energy myself, to attract, and thus give kinetic energy to, many other metallic objects.
So, when I create my magnet, do all of the objects in the universe suddenly gain 'magnetic potential energy', in which case I would have to provide an unrealistic amount of energy to produce the magnet?
So how does COE work with permanent magnets?
With permanent magnets I have been puzzling over how they can obey the conservation of energy.
If I make a permanent magnet then I can use it, expending negligible energy myself, to attract, and thus give kinetic energy to, many other metallic objects.
So, when I create my magnet, do all of the objects in the universe suddenly gain 'magnetic potential energy', in which case I would have to provide an unrealistic amount of energy to produce the magnet?
So how does COE work with permanent magnets?