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Aug 26 at 17:08 vote accept Ethan Davies
Aug 13 at 22:07 comment added Martin Vesely @MonteNero: I meant that for an iron filling to be stuck to a paper and resist a magnetic force necessitates to have an additional energy in comparison with case the fillings just follow a magnetic field. The first configuration is less advantageous from energetic point of view, hence the system is not in ground state.
Aug 13 at 21:51 comment added MonteNero "As additional energy is needed, the system is clearly not in its ground state". How the need of additional work implies not being in the ground state? Sorry my physics background is zero. +1 for an interesting analogy, though somewhat complicated one.
Aug 13 at 9:09 history answered Martin Vesely CC BY-SA 4.0