This was a very helpful video. Current and magnetic fields move perpendicular to each other is something that seems to always be missing from these types of videos. Everything makes more sense to me now.
It depends on which insulator you are talking about. In magnetism we should view materials in terms of how good they conduct magnetic flux and not electric current. For example copper is a good electrical conductor but a bad conductor of magnetic flux. Materials like iron or nickel are feromagentic which means they conduct magnetic flux very well. But air is bad at conducting magentic flux.
