Magnetic fields are created by moving charges from "summary" of Fundamentals of Physics, Volume 1 (Chapters 1 - 20) by David Halliday,Robert Resnick,Jearl Walker
The fundamental concept underlying the creation of magnetic fields is the motion of electric charges. Whenever an electric charge is in motion, it generates a magnetic field in the space surrounding it. This relationship between moving charges and magnetic fields is a key principle in the study of electromagnetism.
The existence of magnetic fields around moving charges was first discovered by Hans Christian Oersted in 1820. He observed that a current-carrying wire caused a nearby compass needle to deflect, indicating the presence of a magnetic field. This groundbreaking experiment demonstrated the intimate connection between electricity and magnetism.
The direction of the magnetic field produced by a moving charge is perpendicular to both the direction of the charge's motion and the direction of the force experienced by the charge in a magnetic field. This relationship is described by the right-hand rule, which allows us to...
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