Capacitance using an axon.. :)? 1. The problem statement, all variables and given/known data An axon membrane is 8.0×10-9 m thick. a) Find the dielectric constant of the membrane, if the capacitance C is 100 nF for an area A = 10.0 square mm. b) If the resting potential across the membrane is ΔV = - 90 mV, what is the charge ±Q on each surface A? c) For this area of membrane at -90 mV, what is the stored electric energy? 2. Relevant equations C=k(eoA)/D 3. The attempt at a solution Basically plugging in the values however i do not know what eo is and the value of it. Thank you for your help.