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Chapter 26: Q. 31 (page 738)
To what potential should you charge a capacitor to store of energy ?
The required potential is .
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What are the magnitude and direction of the electric field at the dot in Figure EX26.7?
Two metal plates are separated by a -thick piece of Teflon.
a. What is the capacitance?
b. What is the maximum potential difference between the plates?
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?
a. Find an expression for the capacitance of a spherical capacitor, consisting of concentric spherical shells of radii (inner shell) and (outer shell).
b. A spherical capacitor with a gap between the shells has a capacitance of . What are the diameters of the two spheres?
A switch that connects a battery to a 10 mF capacitor is closed. Several seconds later you find that the capacitor plates are charged to 30 mC. What is the emf of the battery?
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