[題目] 互感(mutual inductance)

[akw102000 (大白)]

[領域]電磁感應-互感

[來源]課本習題

[題目]Estimate the mutual inductance M between two small loops,of radius r1
      and r2, which are seperated by a distance l that is large compared to r1
      and r2. Give M as a function ofθ, the angle between the planes of the
      two coils. Assume the line joning their centers is perpendicular to the
      plane of coil 1.
      圖：http://0rz.tw/2d2Md

[瓶頸]我看題目看不出磁場變化，所以我不知道磁通量變化。所以就不知道怎麼算互感係
      數。請各位大神指教m(_   _)m


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