Chapter 26: Q. 22 (page 738)
What is the capacitance of the two metal spheres shown in Figure EX26.22?
The capacitance of this system is.
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A typical cell has a membrane potential of , meaning that the potential inside the cell is less than the potential outside due to a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outer surface. This effectively makes the cell wall a charged capacitor. Because a cell's diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell and think of it as a parallel-plate capacitor. How much energy is stored in the electric field of a diameter cell with a thick cell wall whose dielectric constant is ?
Two metal electrodes are spaced apart and connected by wires to the terminals of a battery.
a. What are the charge on each electrode and the potential difference between them? While the plates are still connected to the battery, insulated handles are used to pull them apart to a new spacing of .
b. What are the charge on each electrode and the potential difference between them?
The label rubbed off one of the capacitors you are using to build a circuit. To find out its capacitance, you place it in series with a capacitor and connect them to a battery. Using your voltmeter, you measure across the unknown capacitor. What is the unknown capacitor's capacitance?
The parallel-plate capacitor in Figure Q26.11 is connected to a battery having potential difference . Without breaking any of the connections, insulating handles are used to increase the plate separation to .
a. Does the potential difference change as the separation increases? If so, by what factor? If not, why not?
b. Does the capacitance change? If so, by what factor? If not, why not?
c. Does the capacitor charge change? If so, by what factor? If not, why not?
Figure EX26.3 is a graph of . What is the potential difference between and ?
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