2007-05-21 16:38:03 · 3 answers · asked by LadyRebecca 6 in Science & Mathematics ➔ Other - Science
So, does this mean that there is a form of perpetual energy?
2007-05-23 12:14:44 · update #1
Well, it can go on ad infinetum if there are no external influences forcing it to do otherwise. They can be other (probably stronger) magnetic fields and also influences which change the composition/structure/state of the magnet like intense heat.
2007-05-22 21:05:30 · answer #1 · answered by lemmethink 2 · 0⤊ 0⤋
It has been found that the Earth steadily induces its own magnetic poles into a bar magnet kept in some place for a few weeks.
This results in the weakening of the magnetic force or power of the bar magnet.
To prevent this loss of magnetism, magnetic keepers are used.
Magnetic keepers are pieces of soft iron that are placed across the poles of a bar magnet or a horse-shoe magnet.
They help prevent the loss of magnetism and preserve the magnetism by forming closed magnetic chains.
2007-05-22 00:55:34 · answer #2 · answered by gatorbait 7 · 0⤊ 0⤋
A permanent magnet will stay magnetized essentially forever. I don't know why. It's magic, I guess.
2007-05-22 00:20:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋