Editing Classical electromagnetism (section)

{{redirect|Classical electrodynamics|the textbook by J. D. Jackson|Classical Electrodynamics (book)}}
{{short description|Branch of theoretical physics}}
{{electromagnetism|cTopic=Electrodynamics}}
'''Classical electromagnetism''' or '''classical electrodynamics''' is a branch of [[physics]] focused on the study of interactions between [[electric charge]]s and [[electrical current|currents]] using an extension of the [[classical Newtonian model]]. It is, therefore, a [[classical field theory]]. The theory provides a description of electromagnetic phenomena whenever the relevant [[length scale]]s and field strengths are large enough that [[quantum mechanical]] effects are negligible. For small distances and low field strengths, such interactions are better described by [[quantum electrodynamics]] which is a [[quantum field theory]].