Hi, I'm new here so I'm not sure how formal this should be: I have studied electromagnetism in my Physics AP class at my high school but I have had a question at the back of my head. I don't have a very good physics teacher, and he was unable to explain this to me. My question is why, when charged particles move, do they create electromagnetic fields in concentric circles? My inquiry concerns more why an electromagnetic field is created at all rather than why it is in the form of circles. Thank you.