A certain capacitor has acapacitance of 5.0 mF. After it ischarged to 5 µC and isolated, theplates are brought closer togetherso its capacitance becomes 10 mF.The work (in J) done in this processis:O 1.25 x 10-8O 13.49 x 10-78.33 x 10-7O 17.05 x 10-5O 61.08 x 10-6Clear my choice A certain capacitor has acapacitance of 5.0 mF. After it ischarged to 5 µC and isolated, theplates are brought closer togetherso its capacitance becomes 10 mF.The work (in J) done in this processis:O 1.25 x 10-8O 13.49 x 10-78.33 x 10-7O 17.05 x 10-5O 61.08 x 10-6Clear my choice

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A certain capacitor hnas a capacitance of 5.0 mF. After it is charged to 5 µC and isolated, the plates are brought closer together so its capacitance becomes 10 mF. The work (in J) done in this process is: 1.25 x 10-8 O 13.49 x 10-7 O 8.33 x 10-7 O 17.05 x 10-5 O 61.08 x 10-6 Clear my choice

A certain capacitor hnas a capacitance of 5.0 mF. After it is charged to 5 µC and isolated, the plates are brought closer together so its capacitance becomes 10 mF. The work (in J) done in this process is: 1.25 x 10-8 O 13.49 x 10-7 O 8.33 x 10-7 O 17.05 x 10-5 O 61.08 x 10-6 Clear my choice

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter27: Capacitors And Batteries

Section: Chapter Questions

Problem 6PQ: According to UE=12C(V)2 (Eq. 27.3), a greater capacitance means more energy is stored by the...

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According to UE=12C(V)2 (Eq. 27.3), a greater capacitance means more energy is stored by the capacitor, but according to UE = Q2/2C (Eq. 27.2), a greater capacitance means less energy is stored. How can both of these equations be correct?
Suppose that the capacitance of a variable capacitor can be manually changed from 100 pF to 800 pF by turning a dial, connected to one set of plates by a shaft from 0° to 180°. With the dial set at 180° (corresponding to C — 800 pF), the capacitor is connected to a 500-V source. After charging, the capacitor is disconnected from the source, and the dial is turned to 0°. If friction is negligible, how much work is required to turn the dial from 180° to 0°?
A 2.0F capacitor and a 4.0F capacitor are connected in series across a 1.0-kV potential. The charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. Find the charge on each capacitor and the voltage across each capacitor.
(i) Rank the following five capacitors from greatest to smallest capacitance, noting any cases of equality, (a) a 20-F capacitor with a 4-V potential difference between its plates (b) a 30-F capacitor with charges of magnitude 90 C on each plate (c) a capacitor with charges of magnitude 80 C on its plates, differing by 2 V in potential. (d) a 10-F capacitor storing energy 125 J (e) a capacitor storing energy 250 J with a 10-V potential difference (ii) Rank the same capacitors in part (i) from largest to smallest according to the potential difference between the plates, (iii) Rank the capacitors in part (i) in the order of the magnitudes of the charges on their plates, (iv) Rank the capacitors in part (i) in the order of the energy they store.
A 1-megabit computer memory chip contains many 60.0 1015-F capacitors. Each capacitor has a plate area of 21.0 1012 m2. Determine the plate separation of such a capacitor. (Assume a parallel-plate configuration.) The diameter of an atom is on the order of 1010 m = 1 . Express the plate separation in angstroms.
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According to its design specification, the timer circuit delaying the closing of an elevator door is to have a capacitance of 32.0 F between two points A and B. When one circuit is being constructed, the inexpensive but durable capacitor installed between these two points is found to have capacitance 34.8 F. To meet the specification, one additional capacitor can be placed between the two points. (a) Should it be in series or in parallel with the 34.8-F capacitor? (b) What should be its capacitance? (c) What If? The next circuit comes down the assembly line with capacitance 29.8 F between A and B. To meet the specification, what additional capacitor should be installed in series or in parallel in that circuit?
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A 10.0-F capacitor is charged to 15.0 V. It is next connected in series with an uncharged 5.00-F capacitor. The series combination is finally connected across a 50.0-V battery as diagrammed in Figure P20.83. Find the new potential differences across the 5.00-F and 10.0-F capacitors after the switch is thrown closed. Figure P20.83
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