(Same as Earth, Planetary, and Space Sciences M156 and Physics M122.) Lecture, three hours; discussion, one hour; outside study, eight hours. Requisite: course 101A or Physics 110B. Senior-level introductory course on electrodynamics of charged particles and their collective behavior in plasmas in laboratory, near-Earth space and astrophysical settings. Covers selected applications taken from fusion energy, space weather, materials processing, generation of coherent radiation and particle accelerators. Letter grading.