[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點的電場應該是lQcosθ/4πε，那我要怎樣算出Ex和Ey呀？


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