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Perpetua mobile theoretical misunderstanding

Hello

I was patent examiner on the Portuguese patent office for 3 years and we have a lot of perpetua mobile applications, so I wanted to find now, the theoretical misunderstanding I'm missing here

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Imagine you have a track (on a table, on the xOy plane) on which a metal ball would follow, and at a certain length of the track, there would be a tubular permanent magnet, that would create a force on the ball accelerating it. That ball would be accelerated every time it passes through the tube!

I know that there is some paradox on my lemma, but I can't find where

Thank you in advance

PS: Actually I know that the magnetic field is conservative, but something is missing

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