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[QUOTE="wubwubs, post: 5750550, member: 622211"] [h2]Homework Statement [/h2] Hi guys, I've been trying to solve these two questions for the last hour and can't seem to find the solution, any help would be very much appreciated. :smile: [B]1.[/B] An RC circuit is given a step voltage (charging) of V at t = 0 seconds. What is the value of voltage at t = 2RC? [B]2.[/B] If the conductance of a single ion channel is 1pS and its capacitance per cm2 is 1mF and the time constant for a human neuron is 1ms: [B](a)[/B] What is the resistance per cm2 of a neuronal membrane? [B](b)[/B] How many ion channels on average must there be in one µm2 of neuronal membranes? [h2]Homework Equations[/h2] T = RC Tau = Resistor x Capacitor [h2]The Attempt at a Solution[/h2] 1. Tried attempting this question for a solid hour and not sure where to begin. 2. (a) 1 x 10^-3ms = R x (1 x 10^-6F) R = 1000W per cm2 (b) I know to divide the total current by the single current but I can't seem to find the solution to identify the total current. [/QUOTE]
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