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A parallel-plate capacitor is made of two square plates 40 cm on a side and 2 mm apart. The capacitor is Connected to a 90-V battery. Hint Review Section 8.3 Energy Stored in a Capacitor for the relationship between the energy stored in a capacitor and the dynamical quantities describing the capacitor (charge, voltage, and capacitance). For each scenario, pay close attention to which quantity (voltage or charge) is kept constant as the capacitance changes. a. What is the energy stored in the capacitor? Energy stored in the capacitor is b. With the battery still connected, the plates are pulled apart to a separation of 4 mm. What is the energy stored in the capacitor now? Energy now stored in the capacitor is HJ. HJ. c. This time, starting from situation in (a), with the batteries disconnected (but capacitors still charged), the plates are pulled apart to a separation of 4 mm. What is the energy stored in the capacitor now? Energy now stored in the capacitor is d. Comparing your results in (b) and (c) above, it makes sense that the energy stored in the capacitor increases in (c), because the work done in separating the plates is stored as the electrostatic potential energy. In (b), why does the energy decrease even though work is done in separating the plates? HJ. The energy is not conserved in static electricity. A negative work is done in separating the plates. O The energy due to work done goes into the battery. O The energy stored in the capacitor does not include work done on the charges.

A parallel-plate capacitor is made of two square plates 40 cm on a side and 2 mm apart. The capacitor is Connected to a 90-V battery. Hint Review Section 8.3 Energy Stored in a Capacitor for the relationship between the energy stored in a capacitor and the dynamical quantities describing the capacitor (charge, voltage, and capacitance). For each scenario, pay close attention to which quantity (voltage or charge) is kept constant as the capacitance changes. a. What is the energy stored in the capacitor? Energy stored in the capacitor is b. With the battery still connected, the plates are pulled apart to a separation of 4 mm. What is the energy stored in the capacitor now? Energy now stored in the capacitor is HJ. HJ. c. This time, starting from situation in (a), with the batteries disconnected (but capacitors still charged), the plates are pulled apart to a separation of 4 mm. What is the energy stored in the capacitor now? Energy now stored in the capacitor is d. Comparing your results in (b) and (c) above, it makes sense that the energy stored in the capacitor increases in (c), because the work done in separating the plates is stored as the electrostatic potential energy. In (b), why does the energy decrease even though work is done in separating the plates? HJ. The energy is not conserved in static electricity. A negative work is done in separating the plates. O The energy due to work done goes into the battery. O The energy stored in the capacitor does not include work done on the charges.

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A parallel-plate capacitor is made of two square plates 40 cm on a side and 2 mm apart. The capacitor is connected to a 90-V battery. Hint Review Section 8.3 Energy Stored in a Capacitor for the relationship between the energy stored in a capacitor and the dynamical quantities describing the capacitor (charge, voltage, and capacitance). For each scenario, pay close attention to which quantity (voltage or charge) is kept constant as the capacitance changes. a. What is the energy stored in the capacitor? Energy stored in the capacitor is HJ. b. With the battery still connected, the plates are pulled apart to a separation of 4 mm. What is the energy stored in the capacitor now? Energy now stored in the capacitor is O The energy is not conserved in static electricity. O A negative work is done in separating the plates. HJ. c. This time, starting from situation in (a), with the batteries disconnected (but capacitors still charged), the plates are pulled apart to a separation of 4 mm. What is the energy stored in the capacitor now? Energy now stored in the capacitor is d. Comparing your results in (b) and (c) above, it makes sense that the energy stored in the capacitor increases in (c), because the work done in separating the plates is stored as the electrostatic potential energy. In (b), why does the energy decrease even though work is done in separating the plates? HJ. The energy due to work done goes into the battery. The energy stored in the capacitor does not include work done on the charges.
Transcribed Image Text:A parallel-plate capacitor is made of two square plates 40 cm on a side and 2 mm apart. The capacitor is connected to a 90-V battery. Hint Review Section 8.3 Energy Stored in a Capacitor for the relationship between the energy stored in a capacitor and the dynamical quantities describing the capacitor (charge, voltage, and capacitance). For each scenario, pay close attention to which quantity (voltage or charge) is kept constant as the capacitance changes. a. What is the energy stored in the capacitor? Energy stored in the capacitor is HJ. b. With the battery still connected, the plates are pulled apart to a separation of 4 mm. What is the energy stored in the capacitor now? Energy now stored in the capacitor is O The energy is not conserved in static electricity. O A negative work is done in separating the plates. HJ. c. This time, starting from situation in (a), with the batteries disconnected (but capacitors still charged), the plates are pulled apart to a separation of 4 mm. What is the energy stored in the capacitor now? Energy now stored in the capacitor is d. Comparing your results in (b) and (c) above, it makes sense that the energy stored in the capacitor increases in (c), because the work done in separating the plates is stored as the electrostatic potential energy. In (b), why does the energy decrease even though work is done in separating the plates? HJ. The energy due to work done goes into the battery. The energy stored in the capacitor does not include work done on the charges.
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