College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 44

A charged capacitor is connected to a resistor and a switch as in Figure P18.35. The circuit has a time constant of 1.50 s. Soon after the switch is closed, the charge on the capacitor is 75.0% of its initial charge. (a) Find the time interval required for the capacitor to reach this charge. (b) If R = 250 k , what is the value of C