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Cell membranes (the walled enclosure around a cell) are typically about d= 7.7 nm thick....

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Cell membranes (the walled enclosure around a cell) are typically about d= 7.7 nm thick. They are partially permeable to allow charged material to pass in and out, as needed. Equal but opposite charge densities build up on the inside and outside faces of such a membrane, and these charges prevent additional charges from passing through the cell wall. We can model a cell membrane as a parallel-plate capacitor, with the membrane itself containing proteins embedded in an organic material to give the membrane a dielectric constant of about 12. What is the capacitance per square centimeter of such a cell wall? Express your answer in microfarads per squared centimeter. In its normal resting state, a cell has a potential difference of 85 mV across its membrane. What is the electric field inside this membrane?

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