1. The problem statement, all variables and given/known data The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. Assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 5.77 x 10-6 C/m2. (a) What is the magnitude of the electric field within the cell membrane? (b) Find the magnitude of the electric force that would be exerted on a potassium ion (K+; charge = +e) placed inside the membrane. 2. Relevant equations I don't understand what the second part of this question entails. What does +e tell me? 3. The attempt at a solution I think i understand that the first part is E=5.77E-6/8.8542E-12 because E=sigma/E(not) Therefore, I replace the charge density (sigma) with the charge density for an electron??