2006-07-29 06:27:34 · 7 answers · asked by TERRY G 1 in Science & Mathematics ➔ Chemistry
I think a magnet has a mind of its own. It could stay magnetic forever, it could lose it's net magnet moment, and then get it back one day. It could even abruptly change it's magnetic direction. The colder it is, the more stable it is. At a high enough temperature, all magnets will lose their [ferro] magnetic moment. If placed in a strong enough magnetic field, all magnets will surrender to the will of the field and change their magnetic moment to point with the field.
There really is no such thing as an oppositely charged magnet, since there really is no such thing as magnetic charge. Think of a magnet you hold in your hand as a bunch of little tiny microscopic magnets who like to succumb to peer pressure and point in the same direction as their neighbors, but because of thermal energy, are jiggling around and occasionally point in random directions. The higher the temperature, the harder it is for them to stay focused and work together. Sometimes gangs of tiny magnets, called regions, form and try to convince other gangs to point in their direction. All this is going on right in your hand.
You can watch the blue and the white regions duke it out on this Ising Model applet:
http://bartok.ucsc.edu/peter/java/ising/keep/ising.html
Play with the temperature
If white wins, it's a bar magnet pointing one way, if blue wins, the other way.
2006-07-29 07:58:13 · answer #1 · answered by vickydevil000 3 · 1⤊ 1⤋
Life span can be increased by proper storage ,It should be kept oposite of geogrphical meridian, ie north pole of the magnet should be facing south side of the earth.& in normal ambient temperature.the magnetic force should be closed with manetising metal,not to be scattered.You have to make a enclosure in magnetising metal as shield without any leakage .
2006-07-29 07:09:02 · answer #2 · answered by ricky414 5 · 0⤊ 0⤋
Forever, unless the magnet is de-magnetized or destroyed.
2006-07-29 06:31:02 · answer #3 · answered by cherox 3 · 0⤊ 0⤋
there is such type property for a permanent magnet.........
but its magnetism can be destroyed by hammering or heating it......
however temporary magnets can loose their magnetic property.......
2006-07-29 09:38:05 · answer #4 · answered by rahul 1 · 0⤊ 0⤋
If undisturbed, it can retain its properties forever.
2006-07-29 06:32:19 · answer #5 · answered by ag_iitkgp 7 · 0⤊ 0⤋
this is a physics question, but eh.
magnets have their power forever, if they are not tampered with.
2006-07-29 08:02:39 · answer #6 · answered by Anonymous · 0⤊ 0⤋
forever until it is being demagnetise
2006-07-29 06:30:52 · answer #7 · answered by Anonymous · 0⤊ 0⤋