I think the question of energy stored in a permanent magnet is a redherring. Replace the permanent magnet by a spring. The spring will lose its springiness over time as it is repeatedly compressed. Do we say this is because spring energy is being used up?
Harry On Wed, Sep 5, 2012 at 12:41 PM, James Bowery <jabow...@gmail.com> wrote: > On Wed, Sep 5, 2012 at 11:14 AM, Abd ul-Rahman Lomax <a...@lomaxdesign.com> > wrote: >> >> For example, there is potential energy stored in a "permanent" magnet, in >> the magnetisation. > > > This is one of the quantities that must be entered into the arithmetic I > originally requested of the system cited in the original post. > > If we can assign an inductance and current value to the contents of a > permanent magnet, we can coservatively calculate the energy in a permanent > magnet according to the equation: > > E = L*I^2/2 > > How might we go about assigning L and I values given a specific magnetism?
