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範例:磁場變化的電磁感應[87日大]

同一材質與粗細的電阻線折成兩個邊長各為2a及√2 a的正方形，今將小正方形放置於大正方形內；兩者共面，且接觸處相互絕緣。一均勻磁場B垂直於此平面，如圖所示。若磁場隨時間t作均勻變化，求大、小正方形導線的(1)感應電動勢比值 (2)感應電流的比值。[以上均假設感應電流所生的磁場可略][87日大]


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Posted in 歷屆物理考題, 電磁感應與冷次定律.

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By admin – 2010 年 05 月 14 日

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