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33. 小華畫了一張電流的磁效應實驗示意圖,如圖(二十四)所示,圖中磁針放置於導線的上方,磁針黑色部分為 N 極,所指方向為磁場方向。老師發現此示意圖並不合理,則下列哪一個修改方式的示意圖最為合理?
問題詳情
33. 小華畫了一張電流的磁效應實驗示意圖,如圖(二十四)所示,圖中磁針放置於導線的上方,磁針黑色部分為 N 極,所指方向為磁場方向。老師發現此示意圖並不合理,則下列哪一個修改方式的示意圖最為合理?
(A)
(B)
(C)
(D)
參考答案
答案:C
難度:
簡單
0.675
書單:
沒有書單,新增
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56.已知某鎢絲燈泡的使用規格為交流電源100伏特、額定功率50瓦。將此相同燈泡共5個,並聯後接於100伏特的交流電源下使用。於正常使用的情況下,該交流電源提供的總電流應為多少安培?(A)0.25 安
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57.如【圖57】一小球的質量為1.0公斤,從距離水平地面高度 1.8公尺處,以初速為零自由下落。小球與水平地面發生碰撞後,鉛直反彈到距離水平地面高度為0.8公尺處,設小球與地面的碰撞接觸時間為0.1
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