What if i was travelling in a car with an e- with me. W.r.t to a positive charge at rest , it would seem accelerating to me i.e. it would have a magnetic field but acc. to a person on the ground it would just have an electric field. If there were a car moving relative to me , the person would know that my electron has an electric field but if it were for the person on the ground , he would say it has a magnetic field too. How to get around this dilemma?