Solved: The membrane surrounding a living cell consists of

Chapter 18, Problem 19.60

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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 7.1 106 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.

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