A cell membrane has a surface area of 1.110 7 m 2 , a dielectric constant of

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A cell membrane has a surface area of 1.1×10−7 m2, a dielectric constant of 5.2, and a thickness of 7.2 nm. The potential difference across the membrane is 70 mV. 

(a) What is the magnitude of the charge on each surface of the membrane? 

(b) How many ions are on each surface of the membrane, assuming they are singly charged (∣q∣ = e)?

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