Can a magnet continue to output energy？
A magnet generates a magnetic field. As a field, it cannot do work, but it can participate in the transformation of energy, but it does not generate or lose energy itself. For example, the generator uses other energy to drive the rotor to cut the magnetic field to generate electrical energy, and the motor converts electrical energy into mechanical kinetic energy. Many people have a misunderstanding, using one magnet to push another magnet to move, thinking that the magnet is doing work. In fact, you are actually pushing the two magnets closer to generate potential energy, and you are doing the work yourself. It's a bit like when you lift a rock and do work on the rock, it has gravitational potential energy, and when you let go, the rock falls down and is converted into kinetic energy. The energy originally came from you. There are some videos on the Internet that the coil keeps running in the magnetic field. The reason is that the energy generated by moving the magnetic field or the coil at the beginning, the coil will continue to move without external force, but this system does not generate energy, but there is no channel to consume energy, That led to the continued movement. Then there's actually some friction that turns the energy into heat, so in the end it still stops. Therefore, magnetism has no energy, nor does it generate energy, but can only convert energy, so it will not continue to do work. No object or phenomenon that does not conserve energy has been found so far.
If there is a situation where the magnet can continue to do energy output work, then there must be continuous input of external energy, such as electrical energy.