如图所示电路(电源内阻不计),若开关S是闭合的,流过线圈L的电流为i1,流过灯泡的电流为i2,且线圈直流电阻小于灯泡的电阻。若t1时刻断开S,下列四个图中能正确表示流过灯泡的电流i2随时间t变化关系的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/19/2710354814345216/2714776174043136/STEM/9bde3908-b38e-4014-b1fe-c07d73ba1a86.png)
![](https://img.xkw.com/dksih/QBM/2021/4/19/2710354814345216/2714776174043136/STEM/9bde3908-b38e-4014-b1fe-c07d73ba1a86.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2021-05-05 23:29:10
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【知识点】 含自感线圈的电路闭合及断开后电流的变化及其图像
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【推荐1】如图所示电路,电键S闭合一段时间,在某一时刻t1突然打开电键S,则通过电阻R1中的电流I1随时间变化的图像可用下列哪个图表示( )
![](https://img.xkw.com/dksih/QBM/2012/4/12/1575226550255616/1575226609500160/STEM/ce240ed7-437a-45d7-bb6a-c5a987a98ea1.png?resizew=160)
![](https://img.xkw.com/dksih/QBM/2012/4/12/1575226550255616/1575226609500160/STEM/ce240ed7-437a-45d7-bb6a-c5a987a98ea1.png?resizew=160)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】在如图所示电路中,
为自感系数较大的线圈,
、
灯完全相同,闭合电键
,调节
,使
、
都正常发光,那么在断开和再次闭合电键
后,将看到的现象是( )
![](https://img.xkw.com/dksih/QBM/2013/5/30/1575435627757568/1575435667996672/STEM/0276e331-06a5-48d7-b639-755ab99d1a3e.png?resizew=135)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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![](https://img.xkw.com/dksih/QBM/2013/5/30/1575435627757568/1575435667996672/STEM/0276e331-06a5-48d7-b639-755ab99d1a3e.png?resizew=135)
A.电键闭合瞬间,![]() ![]() | B.电键闭合瞬间,![]() ![]() |
C.电键断开瞬间,![]() | D.电键断开瞬间,![]() |
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