What makes Electricity and Magnetism a "unified" force? I'm taking upper level Electromagnetism and we've dealt with the various formulas dealing with electricity and magnetism. It seems to me that we are still largely dealing with them separately. In that, I mean we have a thing called a magnetic field and a thing called an electric field. They are related sure but what exactly makes them a "unified force". I could be just confused about the semantics of all of this but what makes them a single force?