[領域] 電學                             (題目相關領域)

[來源] 課本習題                         (課本習題、考古題、參考書...)

[題目] One type of electric quadrupole consists of two dipoles placed end to
       end with their negative charges (say) overlapping; that is, in the
       center is -2Q flanked (on a line) by a +Q to either side (文底附圖).
       Determine the electric field E at points along the perpendicular
       bisector and show that E decrease as r^-4.
       (圖:http://0rz.tw/e62yO)

[瓶頸] 不知道為什麼算到後來電場總是全部消光光等於0.  orz

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