Why don't magnetic motors work?
THIS IS NOT A POST ABOUT FREE ENERGY. I know this topic is against the rules, and I am not foolish enough to believe such a thing exists.
I just want to understand the root flaw in such a concept. I have two suspicions about why you can't use the repulsion of magnets (with no other source of input) to generate work.
The first is that its difficult (maybe impossible?) to find some configuration in which any net torque is actually produced. The second is that even if you could find some configuration in which a net torque is produced, the spinning of this wheel of magnets is going to induce currents, which generate heat, and act to demagnetize the magnets, causing your wheel to inevitably slow down.
How far off am I?