推 popintaco:用柱座標比較好積 01/04 21:54
→ gn01216674:我記得孫超群也是用柱座標 考前看一看背一背就好 XD 01/09 10:57
A surface charge is distributed uniformly with density ρs on a rectangular
surface of sides a and b. Find the electric potential at the center of the
rectangular surface.
這題積分超難...煩請各位高手了
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