Consider the circuit shown in the figure. A short time after closing the switch, the charge on the capacitor is 70.0% of its initial charge. Assume the circuit has a time constant of 18.7 s. (a) Calculate the time interval required (in s) for the capacitor to reach this charge. (b) If R = 300 kn, what is the value of C (in uF)?

Consider the circuit shown in the figure. A short time after closing the switch, the charge on the capacitor is 70.0% of its initial charge. Assume the circuit has a time constant of 18.7 s. (a) Calculate the time interval required (in s) for the capacitor to reach this charge. (b) If R = 300 kn, what is the value of C (in uF)?