[題目] 一題dipole 的多極展開
[領域]電磁學 (題目相關領域)
[來源]課本習題David J Griffiths page151 problem3.29 (課本習題、考古題、參考書...)
[題目]for the dipole consists of two equal and opposite charges +-q separated
by a distance d.expand 1/η+- to order (d/r)^3 and use this to determine the
quadrupole and octopole terms in the potential.
[瓶頸] 不知道什麼意義？？？
是說dipole 也可以用多極展開來表示嗎？？？？ (寫寫自己的想法，方便大家為你解答)
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