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. If the frequency is doubled to 80 kHz and the current is kept the same, what will be the peak out-of-phase voltage?A. 0.32 V B. 0.16 VC. 0.080 V D. 0.040 V
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. If the frequency is doubled to 80 kHz and the current is kept the same, what will be the peak out-of-phase voltage?A. 0.32 V B. 0.16 VC. 0.080 V D. 0.040 V
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.
If the frequency is doubled to 80 kHz and the current is kept the same, what will be the peak out-of-phase voltage?
A. 0.32 V B. 0.16 V
C. 0.080 V D. 0.040 V
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