The membrane of a living cell can be approximated by a parallel-plate capacitor withplates of area 4.75 * 10-9m2, a plate separation of 8.5 * 10-9m,and a dielectric with a dielectric constant of 4.5. (a) What is theenergy stored in such a cell membrane if the potential differenceacross it is 0.0725 V? (b) Would your answer to part (a) increase,decrease, or stay the same if the thickness of the cell membrane isincreased? Explain

University Physics Volume 2
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Chapter8: Capacitance
Section: Chapter Questions
Problem 8.6CYU: Check Your Understanding The potential difference across a 5.0-pF capacitor is 0.40 V. (a) What is...
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The membrane of a living cell can be approximated by a parallel-plate capacitor with
plates of area 4.75 * 10-9
m2
, a plate separation of 8.5 * 10-9
m,
and a dielectric with a dielectric constant of 4.5. (a) What is the
energy stored in such a cell membrane if the potential difference
across it is 0.0725 V? (b) Would your answer to part (a) increase,
decrease, or stay the same if the thickness of the cell membrane is
increased? Explain

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