A typical cell has a layer of negative charge on the inner
Chapter 26, Problem 26.70(choose chapter or problem)
A typical cell has a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outside surface, thus making the cell wall a capacitor. What is the capacitance of a 50-mm-diameter cell with a 7.0-nm-thick cell wall whose dielectric constant is 9.0? Because the cells diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell and think of it as a parallel-plate capacitor.
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