I recently particpated in a thread that was closed out before I got the answer to what seemed to me a kind of paradox A permanent magnet attaches to the side of a refrigerator. IT wont stay there forever , but it will for a very long time. All that time gravity wants to pull the magnet off the side of the fridge.Somehow the magnet resists that. 1)Is energy being expended ? 2)If so what is the source 3) Can we calculate with any precision how much energy is needed to hold the magnet in place , or how much will be required to hold it in place for its useful life 4) When it finally does slide down after a long period of time, why does that happen? Because the energy to hold it in place has been used up , or because it is less magnetic than earlier in its life. If the latter , what changed it. This discussion is interesting becasue the old thread raised a key question. Some people thought no energy was consumed because neither the magnet nor the fridge moved. Therefore no work , therefore according to the work function , no energy. Perhaps , but why does it stay in place for awhile but not forever ? Others said the magnet was indeed exerting energy that was stored inside the magnet when it was created. I think what they would have said in more complete discourse is that when the substance the permanent magnet was made of was first magnetized , Energy in the form of a magnetic field caused individual iron molecules to arrange themselves into magnetic domains, and somewhatv like a spring being wound , the domains when they return from their aligned state to a different or unaligned state supply energy. So maybe the molecules in the fridge at the surface bond with the magnet have had their domains aligned with Fridge north to mag south etc. making the fridge a magnet uses up energy and eventually the magnets own alignment is lost , it is less magnetic , gravity wins and it slides to the floor. So , any comments on either the questions or which of the two schools above were more correct?