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國三下理化2-1電池課文重點複習
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任何形狀的磁鐵均具有兩個不同且磁力最強的磁性端,分別稱為(A)極(指向北方的一端或稱指北極)及(B)極(指向南方的一端或稱指南極)。則A . B=(____ ____). [答案間請空1格]
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若假想地球內部存在一巨大條狀磁鐵, 則此磁鐵的N極將落在地球的( )方.
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磁極( )單獨存在. [填可以或無法]
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磁力線的走向:(A)部由磁鐵的N極到S極,(B)部由S極到N極.則A . B=(____ ____).(填內或外) [答案間請空1格]
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兩根磁鐵的磁極互相靠近時,同名極會相( A ),異名極相(B)。則A . B=(____ ____). [答案間請空1格]
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將一長條狀的磁棒水平懸掛,靜止後,可發現其兩端分別指向( )方向。
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磁力線的方向為磁針( )極所指的方向。
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像鐵釘這類物質,一旦將吸附的磁鐵移除後,便無法長期保有磁性的物質, 稱為( )磁鐵。
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磁鐵:具有磁力,可吸引(___ ___ ___ )及其部分合金(通稱為磁性物質),而不會吸引其他材質的製品。[答案間請空1格]
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"將不具磁性的磁性物質(如鐵.鈷.鎳等)靠近磁鐵而暫時具有磁性的現象。" 稱為( ).
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