![]() ![]() Update after spotting the link to a video in the question. If this is the reason for the effect that you have observed then you should observe a force of attraction as the magnet moves away from the aluminium. So there is a force of repulsion between the magnet and the aluminium whilst they are moving towards one another. This is Lena’s law in action where the induced current is in such a direction as to try and oppose the motion (changing magnetic field producing it). What you probably have observed is the result of induced current produced in the aluminium which is in the presence of a changing magnet field produced by the movement of the magnet?Īs the magnet approached the aluminium the magnetic field experienced by the aluminium would have increased and the aluminium would have reacted by trying to move into a region where the change of magnet field was smaller - further from the magnet. However, even if the magnet field was a very strong one produced by a neodymium magnet, that force of attraction would be very small and you would have to set up the apparatus carefully to show the attraction. Aluminium is paramagnetic and so an external magnetic field produced by a magnet would magnetise the aluminium such that the aluminium is attracted to the magnet. ![]()
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