I've been looking at some fusion reactors and I keep wondering how putting some kind of extra magnet in some configuration would affect the field, but I don't know how to figure it out. Like for example if you took a solenoid and sat a permanent magnet down next to it. This is the only thing I could find: https://www.quora.com/How-do-I-calculate-the-magnetic-field-created-by-a-number-of-magnets
Edit: I'm pretty sure it's just super positioning, but I need someone else to answer, because I don't know for sure. Also does it follow from Maxwells equations?