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範例:感應電流與終端速度[89日大]

一長方形金屬線圈,寬度為L,高度為h,質量為m。線圈之上端在一均勻磁場內,磁場之量值為B,方向為垂直進入紙面﹔線圈之下端則在磁場區外,如圖所示。線圈受重力之作用而向下運動,設線圈之電阻為R,在線圈之瞬間速率為v時,計算(a)線圈內之感應電動勢ε的大小及方向(註明方向是順時鐘或逆時鐘)(b)線圈消耗之電功率P(c)圈之瞬時加速度a(朝下為正)(d)在線圈上端未離開磁場區前,此線圈之速率最後會趨近於一定值vT,求vT[89日大]

[89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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