3. Complex RC Circuit Consider the circuit shown below. Initially, the capacitors are uncharged and the switch is open. The capacitances are as follows: Cl = C and C72 = 20. The resistances are: R1 = R, R2 = 2R, and R3 = R4 = 3R. Express your answers to the following questions in terms of C, R, 5, and numerical constants. C1 C2- R2 R3 (a) What is the current that flows onto the upper plate of C1 immediately after the switch is closed? (b) A very long time after the switch is closed, what is the energy stored in C1