Eddy current demonstrator's working principle: why does the magnet fall at different speeds in different aluminum tubes, while the aluminum tubes are the same?
This is eddy current resistance. Used in a vibration system, that is, electromagnetic damping. The permanent magnet moves in the aluminum tube, and the magnetic field produced by the eddy current in the aluminum tube will resist the change of the magnetic field, that is to impede the movement of the magnet.
When the aluminum block falls, no magnetic flux is produced, so the aluminum block falls short. When the magnet and the conductor block have relative motion, eddy currents will be generated in the conductor, and the action of the eddy current will hinder their relative motion.
[principle] the experiment instrument used to demonstrate the law of electromagnetic induction, when the magnet falls from the aluminum tube, the aluminum tube in the induction current, this current will hinder the whereabouts of the magnetic flux generated, so the longer the whereabouts of the magnet.
