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I am a new joinee and this is my first question. I apologise if the question is little trivial. Basically, Think of the following:

Scenario:There is a strong bar magnet and some magnetic metal balls lying on the floor of a room.

Step 1:I lift the magnet from the floor and hold it in my hand. I hold it to a certain height

Step2.I use the magnet from that height (if necessary, moving it in the horizontal plane) to lift a ball. Basically the ball is lifted by the attractive force (assuming it is a sufficiently strong magnet) of the magnet. Now this ball has acquired some potential energy (compared to the floor), depending on its mass m and the height h.

Step3.I repeat step2 for other balls lying on the floor.

Conclusion:We can conclude that the magnetic force of the bar magnet did the work to lift each ball which resulted in the corresponding gain in potential energy.

Question:Now, my question is : In terms of conservation of energy, how do you explain this? I mean, there are some gain in energy (of these balls), but where is the corresponding loss to account for the conservation of energy? Have we not, even if very slightly, increased the total energy of the whole universe?

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# Magnetism and conservation of energy

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