ABSTRACT
Since magnetic effects are more subtle than electric ones, it is helpful to first develop the formalism describing a charge moving in the presence of electric and magnetic fields. Although, unlike an electric field, a magnetic field does no work on a charge, there is a magnetic term in the energy, because the act of turning on a magnetic field produces an electric field, according to Faraday’s law. The history of magnetism did not begin with the phenomena of paramagnetism and diamagnetism, which were first recognized by Faraday in 1845.
