Array ( [0] => Array ( [title] => L54A [link] => https://www.youtube.com/embed/K8PB4ovIyJM ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第54講|Lecture 10 Potentials and Fields|10_3B 10_3_2 The Fields of a Moving Point Charge