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物理 高中

請問第2題C,問什麼會趨近u甚至會趨近跟甲一樣的速度呢?謝謝

吳酸例21德 第1-2 題為題組 如圖所示,在水平面(即紙面) X X X X X Xp X X X (1) 上,有兩條間距為的光滑平行長 直金屬軌道,其電阻可忽略,靜个 X X X X X X X X X X X X X X X X 置於鉛直向下(即穿入紙面) fr xxxx.xxxx 量值為8的均勻磁場中。以兩根 Fot xx 電阻均為R 的導體棒甲與乙,垂 X X X X X X X X X 直跨接於兩軌道上,形成長方形 X X X X X X X X X 迴路。中棒在120時恆以等速率4 沿著軌道向左移動,乙棒在i=0時 為靜止,其後可沿著軌道自由滑 動。假設甲、乙兩棒移動時恆位於磁場B中,且摩擦力、磁及載流平行導 線間的作用力均可忽略。 【105指考】 1.假設以P、Q分別代表乙棒與金屬軌道的兩接觸點,則下列有關迴路上電流與 電位差的敘述,何者正確? (A)在t=0時,長方形迴路上的電流為零 (B)在1=0時,乙棒中的電流由Q流向P,量值為HBL 现 (C)在t=0時,乙棒中的電流由P流向Q,量值為 LBI 3R (D)當t>0時,P、Q間的電位差隨時間逐漸減小至零,然後又逐漸增加 (E)當t>0時,乙棒中的電流由Q流向P,並隨時間逐漸減小,最後趨近於零 2.當t>0時,下列有關乙棒運動的敘述,何者正確? (A)乙棒向右加速移動,而後持續向右作等加速度移動 (B)乙棒向左加速移動,而後減速至静止,並維持不動 (C)乙棒向右加速移動,速率由零持續增加,最後趨近於速率u (D)乙棒向左加速移動,速率由零持續增加,最後趨近於速率 (E)乙棒向左加速移動,接著減速至静止,再反向以等速度朝右移動 答:1.E 2.D 6-27 T t=0 t=0 今 z」 / 工 I (total, R 3Q 流不套去才 =0 2po2 f Slech - 0 1 10 Harja ndot?

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英文 國中

不知道有沒有寫錯,請幫我看看 謝謝~~

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