Relativistic Theory of Electrodynamics: the full story

Electromagnetism: Lecture 7

Theoretical physicist Dr Andrew Mitchell presents an undergraduate lecture course on classical Electromagnetism / Electrodynamics at University College Dublin.

In this comprehensive lecture, I discuss in detail the theoretical formulation of electromagnetism in terms of Einstein's Special Relativity. I introduce from scratch all the technical and mathematical detail about 4-vectors, Lorentz transformations, and relativistic invariants needed for electrodynamics. I discuss the 4-potential and 4-current, and present the covariant formulation of Maxwell's equations in terms of these objects. I examine the electromagnetic field tensor, and show explicitly how electric and magnetic phenomena become intertwined upon changing inertial reference frame. Finally, I derive the relativistic electrodynamic Lagrangian using powerful general principles of locality, Lorentz invariance, and gauge invariance. From it, the Principle of Least Action yields Maxwell's equations, bringing us full-circle.

Full lecture course playlist: https://www.youtube.com/playlist?list=PLotxEOxVaaoLMvrDSSr_nsQDiKcVu8d7u

The textbook "Introduction to Electrodynamics" by Griffiths is recommended reading to accompany this course.

Видео Relativistic Theory of Electrodynamics: the full story канала Dr Mitchell's physics channel