In the circuits in Figures P19.67, P19.70, and P19.72, assume the resistance values are...

In the circuits in Figures P19.67, P19.70, and P19.72, assume the resistance values are and and with capacitances and The emf is The switches are labeled S.

Consider again the circuit in Figure P19.70. After switch is closed for a very long time, switch is opened and switch is simultaneously closed. (a) What is the current through switch the instant after it is closed? (b) Make a sketch of how this current varies with time. (c) What is the current through after it is closed for a very long time?