At first glance, this topic is simple, but one capacitor discharges and the other charges. I hesitated to draw a conclusion, so I did it by arithmetic. But because there is no book at hand, I can't look up Laplacian inverse transform and don't want to deduce it, so I use differential equation to solve it directly, and the conclusion is the same as the preliminary judgment. Summarize (if you don't need a high number, then don't write the process of differential equation) whether this circuit is a circuit in which a charged capacitor discharges through a capacitor and a resistor with an initial value of 0, whether a capacitor string is equivalent to a capacitor (C=C 1*C2/(C 1+C2), and whether a resistor string is equivalent to a resistor (c6544

1、u(0)= 10V； 2. because c1* u (0) = c1* u (t)+C2 * U2 (t) (charge conservation), u2 = u in steady state, so we can know that the steady-state value of u is u = c1* u (0)/(c 3. Time constant T=R*C

therefore

u(t)=[ 1-c 1/(c 1+c2)]*u(0)*e^(-t/t)+c 1*u(0)/(c 1+c2)

= 5e (-t/t)+5 If you know u(t) and t, you can find t, and you can find the equivalent resistance R, and R- 10 is what you want in the problem.