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範例:電磁感應與磁力[99學測]

由長金屬管管口靜止釋放一N極向下鉛直放置的磁棒,如圖8。若金屬管之任一橫截面均可視為一封閉的金屬線圈,此時磁棒正遠離A線圈而接近B線圈,則下列敘述,哪些正確?(應選2項)

(A)磁棒於金屬管中下落較在管外下落慢
(B)磁棒於金屬管中的下落過程僅受重力
(C)由上向下看A線圈上之感應電流方向為順時針方向
(D)由上向下看B線圈上之感應電流方向為順時針方向
(E)磁棒與A線圈之磁力為斥力,與B線圈之磁力為引力

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