Four identical capacitors are connected with a resistor in two different ways. When they are connected as in part a of the figure, the time constant to charge up this circuit is 0.84 s. They are then rearranged as in part b of the figure. What is the time required in this arrangement for the system to reach 90% of its equilibrium charge? C C C R R C + + (a) (b) O 0.77 s O 0.035 s O 1.9 s O 0.34 s O 0.089 s