UC知道英文物理题(circuit)
来源：百度知道 编辑：UC知道 时间：2024/05/22 04:12:34
In the circuit shown, it makes no difference whether the switch is open or closed. What is emf ε3 in terms of the other quantities shown? The circuit diagram is here:
it makes no difference whether the switch
is open or closed,表明ε3等于开关打开时ε1ε2结点以及R1R2结点两端电压。求出这个电压就行。
还是用原始的方法吧，电流I=(ε1+ε2)/(R1+R2)
电压ε3=ε2-R2*(ε1+ε2)/(R1+R2)=(ε2*R1-ε1*R2)/(R1+R2)
ε3=(ε2R1-ε1R2)/(R1+R2)
我怎么觉得是零啊