The nerve cell membrane has both resistance and capacitance therefore it can be modeled as an RC circuit. If the resistance of the cell wall is 3.2 x 107 Ω and its capacitance is 8.9 x 10-11 F, what is the time constant of the system?

A capacitor is discharged in an RC circuit. The current decreases to 50% of its initial value in 1.8 seconds.What is the time constant of the circuit? A) 0.39 sB) 1.7 sC) 3.6 sD) 1.8 sE) 2.6 s

RC Circuits: For the circuit shown in the figure, V = 60 V, C = 40 µF, R = 0.90 MQ, and the battery is ideal. Initially the switch S is open and the capacitor is uncharged. The switch is then closed at time t = 0.00 s. At a given instant after closing the switch, the potential difference across the capacitor is twice the potential difference across the resistor. At that instant, what is the charge on the capacitor? 03 R C

At time t= 0, an RC circuit consists of a 20.0-V emf device, a 62.0- resistor, and a 152.0-μF capacitor that is fully charged. The switch is thrown so that the capacitor begins to discharge. (a) What is the time constant of this circuit? S (b) How much charge is stored by the capacitor at t = 0.5t, 2t, and 4t? q(t = 0.5T) = q(t = 2T) = q(t = 4T) = 999 με