A、如图所示,半径为R载有电流I<sub>1sub>的导体圆环,与载有电流I<sub>2sub>的长直导线AB彼此绝缘,放在同一平面内,AB与圆环的直径重合。试求圆环所受安培大小和方向。r /> rc="https://img.ppkao.com/2018-10/yuanhao/2018101016521152590.jpg" />
A、如图所示电路中,u<sub>Ssub>=10sin314tV,R<sub>1sub>=2Ω,R<sub>2sub>=1Ω,L=637mH,C=637μF,求电流i<sub>1sub>,i<sub>2sub>和电压u<sub>csub>。r /> rc="https://img.ppkao.com/2018-09/tangxueping/2018092818010827576.jpg" />
A、如图所示为电桥电路,已知R<sub>1sub>=1Ω、R<sub>2sub>=2Ω、R<sub>3sub>=2Ω、R<sub>4sub>=4Ω、R<sub>5sub>=5Ω,试求等效电阻R<sub>absub>。r /> rc="https://img.ppkao.com/2018-05/tangxueping/2018051015543465216.jpg" />
A、如图所示电路为何种电路?当输入信号u<sub>ssub>与U<sub>csub>的波形如图所示时,画出u<sub>osub>在加电容C前后的波形。r /> rc="https://img.ppkao.com/2018-09/tangxueping/201809131005477043.jpg" />
A、R<sub>1sub>烧坏,R<sub>2sub>不会烧坏 B、R<sub>1sub>,R<sub>2sub>均烧坏 C、R<sub>1sub>未烧坏,R<sub>2sub>烧坏 D、R<sub>1sub>,R<sub>2sub>均未烧坏
A、如图所示,一个封闭水箱,下面有一1/4园柱曲面AB,宽为1m(垂直于纸面方向),半径R=1m,h<sub>1sub>=2m,h<sub>2sub>=3m,计算曲面AB所受静水总压力的大小、方向和作用点。r/> rc="https://img.ppkao.com/2019-04/wangjue/2019041617304829158.jpg"/>
A、如图所示轮系中,rc="https://img.ppkao.com/2018-08/lina/2018082916323943630.jpg" />,且知n<sub>1sub>=n<sub>5sub>=1500r/min,转向如图所示。求轴A的转速大小和转动方向。r />
rc="https://img.ppkao.com/2018-08/lina/2018082916324399679.jpg" />