Cell Membrane Resistance The capacitance of biological membranes is about 1.0 μ F per cm 2 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 μ A 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 capacitance of a cell membrane is measured to be 6.0 × 10 –11 F, what is the area? A. 6.0 × 10 –13 m 2 B. 6.0 × 10 –11 m 2 C. 6.0 × 10 –9 m 2 D. 6.0 × 10 –7 m 2
Cell Membrane Resistance The capacitance of biological membranes is about 1.0 μ F per cm 2 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 μ A 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 capacitance of a cell membrane is measured to be 6.0 × 10 –11 F, what is the area? A. 6.0 × 10 –13 m 2 B. 6.0 × 10 –11 m 2 C. 6.0 × 10 –9 m 2 D. 6.0 × 10 –7 m 2
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 capacitance of a cell membrane is measured to be 6.0 × 10–11 F, what is the area?
6. 6. There are 1000 turns on the primary side of a transformer and 200 turns on thesecondary side. If 440 V are supplied to the primary winding, what is the voltageinduced in the secondary winding? Is this a step-up or step-down transformer?
7. 80 V are supplied to the primary winding of a transformer that has 50 turns. If thesecondary side has 50,000 turns, what is the voltage induced on the secondary side?Is this a step-up or step-down transformer?
8. There are 50 turns on the primary side of a transformer and 500 turns on thesecondary side. The current through the primary winding is 6 A. What is the turnsratio of this transformer? What is the current, in milliamps, through the secondarywinding?9. The current through the primary winding on a transformer is 5 A. There are 1000turns on the primary winding and 20 turns on the secondary winding. What is theturns ratio of this transformer? What is the current, in amps, through the secondarywinding?
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Chapter 26 Solutions
College Physics: A Strategic Approach (3rd Edition)
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