How do you prove that a magnet based perpetual motion machine is impossible? In many of the fake videos, the basic idea is that a magnet enters in the vicinity of another magnet in such a way that it leaves the magnetic field of the other magnet with more energy than it took to enter it. And this is achieved by orienting the magnets and their fields just the right way. >dah the conservation of energy Yes but is there a deeper mathematical proof why the magnetic machine is impossible that doesn't just rely on the assumption of conservation of energy?