1 . 如图所示,交流发电机的矩形线圈边长
m,
m,线圈匝数为50匝,线圈的总电阻
,线圈在磁感应强度
T的匀强磁场中绕垂直于磁场的轴以
r/s的转速匀速转动,外接电阻
,电压表为理想交流电表,则( )
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728019792969728/2728248868282368/STEM/0c8a8a52-cd18-4704-aab3-d50011285db6.png?resizew=443)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1d5dbb3c03523b263357c54b6d6cfec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61697e73e012fbfae909abff47c06959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9e80c61344f43d19f078640276aff3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/349d3bd6f96b3c6561f7ec7a0aa7add7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86730eae11eb908f4d0d6972e0b27ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de88e62d5389480e19510382c1501c8f.png)
![](https://img.xkw.com/dksih/QBM/2021/5/24/2728019792969728/2728248868282368/STEM/0c8a8a52-cd18-4704-aab3-d50011285db6.png?resizew=443)
A.图中线圈位置为中性面 |
B.若以图中位置开始计时,感应电动势的表达式为![]() |
C.图甲中电压表示数为160V |
D.图乙中,外电路接原、副线圈匝数之比![]() |
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2 . 理想变压器与三个阻值相同的定值电阻
、
、
组成如图所示的电路,变压器原、副线圈的匝数比为
,在a、b间接入正弦式交变电流,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/4/10/2696875574927360/2697686412025856/STEM/d0385a4c-b146-434f-900f-8c246c584387.png?resizew=312)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efc18a5bb2e53586331b2a58538a48b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f20f21a9d50b61dac519a3ddab539d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2c4640b2bee411935f588fc5433c74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://img.xkw.com/dksih/QBM/2021/4/10/2696875574927360/2697686412025856/STEM/d0385a4c-b146-434f-900f-8c246c584387.png?resizew=312)
A.![]() ![]() ![]() ![]() |
B.![]() ![]() ![]() ![]() |
C.a,b间输入功率与变压器输入功率之比为![]() |
D.a、b间输入电压与变压器输入电压之比为![]() |
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