[領域] 電磁學 (題目相關領域)
[來源] 期中考 (課本習題、考古題、參考書...)
[題目] What are the physicl meaning of free charge and bound charge?
What are the physicl meaning of free current and bound current?
[瓶頸] griffi課文讀了好幾遍 還是沒有physicl meaning....
老師還強調不能只給equation (寫寫自己的想法，方便大家為你解答)
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