下图为示波器原理图,如果荧光屏的第二象限有亮斑,则_____ 接正极(X,X')____ 接正极(Y,Y');在电极YY'之间所加电压按b图所示规律变化,在电极XX'之间所加电压按c图所示规律变化,则荧光屏上看到的图形是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/74180d9c-eab1-4fd9-a8a0-93d8945d4fbc.png?resizew=745)
A.
B.
C.
D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/74180d9c-eab1-4fd9-a8a0-93d8945d4fbc.png?resizew=745)
A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/b28a5cbf-3df2-4df5-96f8-8f78090a79a1.png?resizew=79)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/d077bf4b-1808-4e5a-a87c-001db89cf05c.png?resizew=79)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/c523d35e-09bc-4754-b881-044fcf0ef197.png?resizew=82)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/30/6e88c018-f529-4516-91d2-0cdb54e57a9c.png?resizew=79)
更新时间:2019-10-02 18:36:14
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【知识点】 根据示波器原理推断荧光屏上图象
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【推荐1】图为示波器的核心部件示波管的原理示意图,电子枪发射出的电子经加速电场(加速电压大小为U1)加速后,再经过偏转电场后打在荧光屏上。偏转电极Y和Y'之间的电压为U2,X和X'之间的电压为U3,若U2和U3均为0,则电子打在荧光屏上的中心点;若电子打在荧光屏上的区域③,则极板X的电势______ 极板X'的电势,极板Y的电势______ 极板Y'的电势。(均选填“大于”或“小于”)
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【推荐2】如图1所示的示波管,当两偏转电极
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电压为零时,电子枪发射的电子经加速电场加速后会打在荧光屏上的正中间,图示坐标的O点
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电场的场强方向重合
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接负极的是___________ 板;打出线段AB时,
板间电压___________
填“变”或“不变”
的;打出线段BC时,
板间电压是否可以为正弦形电压?___________
填“是”或“否”
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【推荐3】(1)图甲为示波器的核心部件示波管的原理示意图,电子枪发射出的电子经加速电场(加速电压大小为
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和
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