Read the basic courses in magnetism and current loop equivalence with a magnet:
http://fr.wikipedia.org/wiki/Magn%C3%A9tostatique
http://fr.wikipedia.org/wiki/Induction_magn%C3%A9tique
An even clearer case because without energy dissipation, a magnet floating above a superconductor which has a perpetual current induced by the magnet strong enough to support the magnet perpetually without supplying energy, keeping the temperature at that of liquid nitrogen !!
http://fr.wikipedia.org/wiki/Supraconductivit%C3%A9
The analogy with a spring corresponds to what l
energy of the force which acts between the magnets (or the magnet and the superconductor) while pushing to bring them closer, is stored as for a spring, in the superconductive currents, or in the field and inside the magnets in the electronic currents, also perpetual, of the atoms of the magnets.
As for a spring, by releasing, we discard them, and we recover the same energy.
We must understand electromagnetism, fundamental with more than 200 years of work and research !!
http://fr.wikipedia.org/wiki/%C3%89lect ... C3%A9tisme
It's more complex than a spring, with the induction law, but
energy is stored without dissipation if the positions are fixed.
and there is an exchange of energy between its different forms, during movement, mechanical, towards electric currents and magnetic and electrostatic fields.
If the resistance of the conductor is not zero, there is dissipation and the magnet falls, but
if the resistance is zero, as for superconductors and magnets, there is static equilibrium (much more stable with superconductors) as for a spring with a weight on it. !!
Capt_Maloche’s sentences are not clear enough, too based on differences between words,
because a moving force gives or receives energy and therefore any immobile force corresponds to an energy previously stored to establish it, as for a spring: therefore
a magnetic field being the force on a unit magnetization magnet is linked to its source like the magnet (or the superconductor) which also produces it at the atomic level, to have it once produced.
A single isolated superconductor has no magnetic field, but subject to the magnetic field of a magnet,
this superconductor produces a field opposed by the induced perpetual currents which prevent the field of the magnet from penetrating in the superconductor and make float the magnet in perpetuity above !!
Urban artist
the magnetic field stores magnetic energy in a vacuum around the magnet and the superconductor, crucial for the propagation of electromagnetic waves and light, demonstrated by Maxwell for the first time in 1863.
http://fr.wikipedia.org/wiki/Champ_magn%C3%A9tique
http://fr.wikipedia.org/wiki/%C3%89nerg ... C3%A9tique
in English :
http://en.wikipedia.org/wiki/Maxwell%27s_equations
too high level in French
http://fr.wikipedia.org/wiki/%C3%89quations_de_Maxwell