Stored energy in magnetic field for neodymium magnet is around 40-50 MGOe. As one MGOe is 7960 J / m³, this means that energy stored in 1 cm³ neodymium magnet is 360 millijoules. That is, it is negligible for all practical purposes and certainly this field energy is not the source why permanent magnets can do work.
—Jouni http://en.wikipedia.org/wiki/Oersted On 6 September 2012 19:10, Abd ul-Rahman Lomax <a...@lomaxdesign.com> wrote: > At 11:46 PM 9/5/2012, mix...@bigpond.com wrote: > >> In reply to Jouni Valkonen's message of Wed, 5 Sep 2012 20:27:51 +0300: >> Hi, >> [snip] >> >> I'm not sure whether or not it represents stored energy, but if you >> multiply the >> MGO of a magnet by it's volume, you get a number of Joules (it's not much >> BTW). >> > > How much? If we dissolved magnetic material in an acid, compared with > dissolving the same weight of the magnet material, unmagnetized, same other > conditions, could we measure a temperature increase for the dissolved > magnetized material vs. the dissolved non-magnetized material? I do assume > the energy would end up as heat. If it's a reasonable amount of heat, this > would make a nice science fair project. >
