The switch in the circuit below is closed allowing the fully charged capacitor to discharge through the resistor. The time constant of this circuit is 1.5s.
(a) After how much time did the charge on the capacitor drop to 0.75% of its maximum value?
(b) What is the capacitance of this capacitor if the resistance R is 250kΩ?
(c) If the capacitor is a parallel plate capacitor with square plates and the distance between the plates of 1mm, what is the length of the square plates?