For some reason I've thought about the following case : A uniformly non conductor charged disk is rotating with an angular velocity [tex]\vec \omega[/tex]. If I see it in front of me I'd observe a magnetic field since moving charges produce a current which produce a magnetic field according to Ampere's Law. So if I hang a magnet over the rotating disk it would suffer some force because of the magnetic field created by the disk. However if I chose, as a reference frame, the center of the disk, I'd see no current since no charge is moving. Hence no magnetic field and the magnet wouldn't be deflected at all while being closer and closer to the disk. It doesn't seem possible so I'm guessing I'm misunderstanding something. Can you explain what's happening?