College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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1-The capacitance represents "how much excess charge a capacitor can hold when a certain electric potential difference is applied." in other words, the greater the capacitance, the more excess charge the plates can hold even as the electric potential difference is unchanged. Now, consider a charged parallel-plate capacitor disconnected from a voltage source where the separation between the plates is reduced... Which of the following choices below represents the effect of this change on the capacitance of the capacitor plates?
- The capacitance is reduced
- The capacitance is increased
- The capacitance is unchanged
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- 1 Lightning Consider the earth and a layer of clouds 800 m above the earth's surface as a parallel plate capacitor. (a) If the cloud layer has an area of 1 km², then what is the capacitance? (b) An electric field strength greater than 3.0 x 106 V/m will generate a lightning strike: The air will break down and conduct electricity. What is the maximum charge that can accumulate on the cloud?arrow_forwardA capacitor is connected to a battery and given time to reach its full charge. You then slide a sheet of plastic between the plates of the capacitor, while holding the potential difference across the capacitor constant by leaving the battery connected. Which of the following has increased as a result of this change? I. The capacitance of the capacitor. II. The potential difference across the capacitor. III. The charge on the plates of the capacitor. IV. The energy stored by the capacitor.arrow_forward2. The dielectric of a parallel plate capacitor is to be constructed from benzene (K = 2.3). The area of each plate is to be 0.50 m². a) What thickness should the layer of benzene be if the capacitance is to be 0.10 μF? b) What is the charge on the capacitor if it is connected to a 12-volt battery?arrow_forward
- The parallel plates of a capacitor have an area of 0.15 m2 and are separated by 1 mm in air. i) What is the capacitance? ii) If the distance is doubled, what would be the new capacitance? iii) How is the capacitance modified if a dielectric of K=2 is added between the plates?arrow_forwardThe figure below shows a parallel plate capacitor with a surface area A and with a gap between its plates. A potential difference is applied between them. Then the battery is disconnected and a dielectric sheet of thickness b and with dielectric constant is placed between the plates as indicated. A.- What is the initial capacitance? B.- What free charge appears on the plates? C.- What is the electric field between the plates and inside the dielectric? D) What is the potential difference between the plates when the dielectric is introduced? E) What is the new capacitance when the dielectric is introduced?arrow_forward
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