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範例:電磁感應與終端速度[81日大]

如圖abcd為靜置於水平面上,寬度為L而長度甚長的U型金屬滑軌,bc邊接有電阻R(其他部分電阻可忽略)ef為一可在滑軌面上滑動,質量為m的均勻金屬棒。一均勻磁場B垂直滑軌面。今金屬棒以一水平細繩跨過定滑輪,連接一質量為M的重物。今重物M自靜止開始下落,假設滑輪無質量,且金屬棒在運動中均保持與bc邊平行。忽略所有摩擦力,則(a)當金屬棒作等速運動時,其速度V為若干(忽略bc邊對金屬棒的作用力)?(b)此時電阻損耗的功率為若干(MB、LR及重力加速度g表示之)?[81日大]


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Posted in 歷屆物理考題, 電磁感應與冷次定律.

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