2011.4.19 -- 電磁 -- Magnetic Vector Potential , 新理解

http://www.2dix.com/view/view.php?urllink=http%3A%2F%2Fwww.ittc.ku.edu%2F~jstiles%2F220%2Fhandouts%2FThe%20Integral%20Definition%20of%20Magnetic%20Vector%20Potential.pdf&searchx=magnetic%20vector%20potential

A .. . .好難講, 裡面有些比較好懂的圖