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图甲是阻值为1Ω的单匝线圈与阻值为9Ω的电阻R构成的回路.线圈在匀强磁场中绕垂直于磁场方向的轴匀速转动,产生的电动势随时间变化的规律如图乙所示,电压表为交流电压表.则( )
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高三下学期物理《》真题及答案
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如图a所示一个电阻值为R.匝数为n的圆形金属线与阻值为2R的电阻R.1连结成闭合回路.线圈的半径为r
如图甲是阻值为5Ω的线圈与阻值为105Ω的电阻R.构成的回路线圈在匀强磁场中绕垂直于磁场方向的轴匀速
电阻R.上消耗的功率为400W
电阻两端电压为220V
电流表的示数为2A
通过电阻的电流方向每秒变化50次
15分如图18a所示一个电阻值为R.匝数为n的圆形金属线与阻值为2R.的电阻R1连结成闭合回路线圈的
在用电阻箱电压表测定一个未知定值电阻RX的阻值时小明设计了如图30甲所示的实验电路其中R/是电阻箱R
如图甲所示正方形金属线圈所围的面积S.=0.04m2匝数n=100匝电阻r=2.0Ω线圈与灯泡L.构
如图所示面积为S.匝数为N.电阻为r的线圈与阻值为R.的电阻构成闭合回路理想交流电压表并联在电阻R.
在t=0时刻,线圈处于中性面,流过电阻R.的电流为0,电压表的读数也为0
1秒钟内流过电阻R.的电流方向改变
次
在电阻R.的两端再并联一只电阻后,电压表的读数将减小
在电阻R.的两端再并联一只电容较大的电容器后,电压表的读数不变
如图甲所示n=15匝的圆形线圈M.其电阻为1Ω它的两端点ab与阻值为2Ω的定值电阻R.相连穿过线圈的
理想变压器输入电压波形如图甲.所示原副线圈匝数比51已知输入回路中电表A1读数为2A则
图乙中电流表A
2
读数10A
图乙中电压表读数56.4V
图乙中电阻R.的阻值为4Ω
变压器的输入功率为400W
如图甲所示n=15匝的圆形线圈M.其电阻为1Ω它的两端点ab与阻值为2Ω的定值电阻R.相连穿过线圈的
如图所示矩形单匝线圈abcd放置在磁感应强度大小为B的匀强磁场中绕OO′轴匀速转动转动的周期为Tab
图甲和图乙是利用热敏电阻来测量温度的原理图.电源电压均为20V且保持不变定值电阻R0的阻值为30Ω.
在用电阻箱电压表测定一个未知定值电阻RX的阻值时小明设计了如图甲所示的实验电路其中R/是电阻箱R0是
如图甲所示一个电阻值为R.匝数为n的圆形金属线圈与阻值为2R的电阻R1连接成闭合回路.线圈的半径为r
在用电阻箱电压表测定一个未知定值电阻RX的阻值时小明设计了如图26甲所示的实验电路其中R/是电阻箱R
如图a所示一个电阻值为R.匝数为n的圆形金属线与阻值为2R的电阻R.1连结成闭合回路.线圈的半径为r
如图所示理想变压器的原线圈匝数n1=1600匝副线圈匝数n2=800匝交流电源的电动势瞬时值e=22
和交流电压表V.的内阻对电路的影响可忽略不计.则 A.当可变电阻R.的阻值为110
时,变压器的输入功率为110W
当可变电阻R.的阻值为110
时,电流表A.的示数为2A
当可变电阻R.的阻值增大时,电压表V.的示数增大
通过可变电阻R.的交变电流的频率为1 OOHz
如图甲所示一个电阻值为R.的圆形金属线圈与阻值为2R.的电阻R.1连接成闭合回路线圈的半径为r在线圈
如图a所示一个电阻值为R.匝数为n的圆形金属线圈与阻值为2R.的电阻R.1连接成闭合回路.线圈的半径
如图甲所示一个电阻值为R.匝数为n的圆形金属线圈与阻值均为2R.的电阻R.1R.2连接成闭合回路线圈
如图a所示一个电阻值为R.匝数为n的圆形金属线圈与阻值为2R的电阻R.1连接成闭合回路线圈的半径为r
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