Answered: The capacitance of biological membranes…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 73P: A battery has an emf and internal resistance r. A variable load resistor R is connected across the...

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The capacitance of biological membranes is about 1.0 μF per cm2 of membrane area, so investigators can determine the surface area of a cell membrane by using intracellular electrodes to measure the membrane's capacitive reactance. An investigator applies a 1.0 μA peak current at 40 kHz to a cell and measures the peak out-of-phase voltage--that is, the component of the voltage due to the capacitive reactance of the cell membrane--to be 0.16 V. What is the approximate capacitance of the cell membrane?

A. 20×10⁻¹¹F

B. 10×10⁻¹¹F

C. 2.5×10⁻¹¹F

D. 5.0×10⁻¹¹F

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