I would like to know what happens in the following situation. (I am not planning on actually doing this - I just want to understand).
Suppose I have a permanent magnet contained in a plastic capsule, where the magnet has enough space to move and rotate. The capsule is placed near a mass of ferrous metal, and the magnet inside is attracted to the metal. This ferrous metal object is then magnetized, and has magnetic field lines moving through it originating from the magnet inside the capsule.
Another, stronger, magnet is moved near the capsule. The north pole of the larger magnet is near the north pole of the magnet in the capsule, and causes the magnet inside the capsule to flip around. The larger magnet is then moved away, and again the capsule magnet is attracted to the ferrous metal nearby.
I am interested to know what difference would be made to this operation if the capsule is made of copper instead of plastic. The flipping of the magnet inside the capsule causes a changing magnetic field which induces an electric field inside the conductive copper for a brief period. How would this influence the extent to which the nearby ferrous metal object is magnetized at that moment the magnet is moving? If we compare the magnetic field lines in the ferrous metal in the two situations - one with the plastic capsule and one with the copper capsule - how would they differ?