As Figure P23.79 shows, a single cell in a sample of tissue can be modeled by a

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As Figure P23.79 shows, a single cell in a sample of tissue can be modeled by a circuit consisting of two resistors and a capacitor. RI is the resistance of the fluid in the cell’s interior, RE the resistance of the fluid surrounding the cell, and C the capacitance of the cell membrane.

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a. In one experiment, a 100 nA current I has been passing through the circuit for a long time. What is the potential difference across the capacitor?

b. The current is suddenly turned off. How long does it take for the potential difference between points a and b to reach onehalf of its initial value?

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College Physics A Strategic Approach

ISBN: 9780134779218

4th Edition

Authors: Randall D. Knight, Brian Jones

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