D2 notes: Magnetism
When you think about magnetism you naturally think about horseshoe magnets, North and South poles, compasses and fridges. But to understand the fundamental nature of magnetism we need to look at something different: moving charges. Let's start with this and come back to fridge magnet later. Magnetism is related to moving charges. Two current-carrying conductors experience a force: The magnetic or Lorentz force: To...