I was reading about plasma the other day, and I was really impressed how it interacts with magnetic field. Reasons as to why it behaves the way it does were clearly explained, but I ran into a couple of problems: If there is a magnetic field inside plasma, compressing plasma also compresses field lines of the magnetic field. If there is no magnetic field present in plasma, moving the plasma towards a magnetic field results in field lines moving out of plasma's way. Now, how can a magnetic field be created in plasma, as it (outside of a field) pushes the field away? And if there is a magnetic field in plasma, what would happen if somebody started to pull plasma outwards of the field? Would the magnetic field expand forever or would at some point exist plasma and return to its original position?