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Could someone please point out where I'm going wrong with the following problem.

If I place a magnet on a vertical surface such that the magnet must resit the force of gravity in order to hold itself in place, will this magnet stay in place forever? If it does why does this not mean the magnet is supplying infinite energy to resit the force of gravity. My thinking was that the magnet would naturally degrade over time thus getting out of the infinite energy problem, however, I'm not at all convinced this is correct.

Any help you can give me on this problem would be hugely appreciated.

Thanks