Before the switch closes at t = 0, the circuit is in steady state. R1=R3=3 kΩ,R2=R4=10 kΩ,C1=8 μF ,C2=9 μF. What is the value of the time constant τ1in ms that governs the behavior of v1 as a function of t for t>0? (Hint: Find the Thevenin equivalent for t>0.)
To calculate the thevenin equivalent I short circuit the voltage sources, but what does this short-circuit by-pass ?