4. The open circuit in Fig. 4 features two capacitors of capacitances C1 = 20 and C2 = C that are not charged and where the voltmeter would monitor voltage V(t) across capacitor C as a function of time t. The circuit also has two resistors with resistances R1 = R and R2 = R and the battery of known emf & with negligible internal resistance. The capacitances and resistances are specified in the known units C and R. At time t = 0, switch S, is closed. At some later time t = t, when the voltmeter shows value V(ti) = 8/3, switch S2 is also closed. Find time ti. What would be voltmeter reading V (t2) at time to = 2t1? R1 C2 S2 1 3 C1 Figure 4: Illustration for problem 4