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範例:發電機原理[89省聯]

交流發電機的線圈面和磁場垂直(如右圖)由靜止開始轉動，已知其最大感應電動勢ε選出正確的敘述。(A)當線圈面和磁場垂直時，感應電動勢最大 (B)當線圈面轉動30o時，瞬時感應電動勢為ε/2C)當線圈面和磁場垂直時，感應電流方向改變 (D)當線圈面和磁場平行時，感應電流為零 (E)當線圈面轉動90o時，平均感應電動勢量值為ε/π[89省聯]


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By admin – 2010 年 05 月 14 日

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