On Sun, Apr 14, 2013 at 5:08 PM, David Roberson <[email protected]> wrote:
The important questions that we need answered are how much actual energy is > stored in the original magnet and how much can we borrow? Who wants to > tackle these questions? > I'll give it an attempt. The energy stored in the field of a magnet is equivalent to the energy needed to magnetize the magnet in the first place. Concretely, whatever process that is used to magnetize an ingot of iron in an industrial process will require electricity as an input, plus waste electricity that leaves the system as heat. I'm guessing the energy in the field is equivalent to the total energy less the waste energy. Eric
