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範例:原電動勢與感應電動勢[88北聯]

一發電機G和一相距d的平行長軌條相聯結。軌條無摩擦亦無電阻,有一金屬線質量m,電阻為R,橫跨於軌條上。全體置於均勻向上的磁場B中,且發電機的電動勢ε保持一定,提供電流I,如圖,若金屬線原為靜止,則下列敘述何者正確?(A)金屬線開始向右運動後,會產生與電流I同向的感應電流 (B)金屬線的加速度為定值 (C)金屬線所受的淨力最大為dIB (D)金屬線運動的最大速度為v (E)金屬線速度達最大時,線內的淨電流為零。[88北聯]


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