[題目] 電位與電位能
[領域] 電位與電位能
[來源] 課本習題
[題目]Determine the component of the electric field, Ex and Ey, at any point P
in the xy plane due to a diapole, 圖:http://0rz.tw/612Cd
Assume r=(x^2+y^2)^1/2 >> l
[瓶頸]我算出p點的電位應該是lQcosθ/4πε,那我要怎樣算出Ex和Ey呀?
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