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國三下理化2-4電磁感應課文重點複習
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因磁場變化而產生的電流, 稱為( )電流.
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( )指磁場變化產生電流的現象。
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英國科學家法拉第利用( )原理發明了歷史上最早的發電機。
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如圖所示, 當磁鐵N極靠近線圈時, 線圈將產生磁場來對抗外來磁場所造成的變化. 則A. B各表示何種磁極. A . B=( ____ _____ )
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發電機是利用磁場變化將( )能轉換為電能的機器。
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