Are you studying in the US?
No, Tunisia, 2nd year of CPGE (Maths/Physics), French curriculum.
What's different about these four?
It's just the names, what matters is the equations themselves I believe, the names only reflect their history (except for that third one indeed, it seems like a description but that's the actual name used[0] )
0.http://fr.wikiversity.org/wiki/%C3%89lectromagn%C3%A9tisme_d...