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9720(97指考)如圖5所示,一直角三角形線圈兩邊長分別為

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Uploaded by on Jan 30, 2012

(97指考)如圖5所示,一直角三角形線圈兩邊長分別為a及l、電阻為R,以等速度v通過一範圍為d強度為B的均勻磁場,磁場的方向為垂直射入紙面,在時間t=0時,線圈­的前緣恰接觸磁場的邊緣。則線圈上的感應電流i與時間t的關係圖是下列何者?(設電流逆時針方向為正)

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