Answered: energy for the 10 uF

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Physics

energy for the 10 uF

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 17PQ: A pair of capacitors with capacitances CA = 3.70 F and CB = 6.40 F are connected in a network. What...

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Suppose that the capacitance of a variable capacitor can be manually changed from 100 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°. (a) What is the charge on the capacitor? (b) What is the voltage across the capacitor when the dial is set to 0°?
Three capacitors are connected as shown, where C = 0.045 F. A. Input an expression for the equivalent capacitance between points a and b, in terms of C. B. What is the capacitance, in farads? C. If the capacitors are charged with a ΔV = 10 V source, how much energy will the circuit store, in joules?
You have a number of identical capacitors, each with a capacitance of 10 micro F and a working voltage of 20kV. How would you connect the capacitors such that the minimum number of capacitors is used that would be sufficient for a working voltage of 40 and an equivalent capacitance of 20 micro F? whhch of the following diagrams is correct?
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a. Find the capacitance C and the charge Q if connectedto 200-V battery. Assume the dielectric constant is K =5.0.b. A capacitor has a capacitance of 6μF with air as thedielectric. A battery charges the capacitor to 400 V and isthen disconnected. What is the new voltage if a sheet ofmica (K = 5) is inserted? What is new capacitance C ?c. Find the equivalent capacitance of a circuit in which a6-μF capacitor is connected in series with two parallelcapacitors whose capacitances are 5 and 4 μF.
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The diagram below depicts a cross section of coaxial conductor with an inner wire of diameter di and an outer conducting sheath of inside diameter do, and some material placed in the space between the two wires. Suppose that you have a coaxial wire with di=1.3 mm and do=7.55 mm, and we put mylar (κ=3.1) in the space between the two wires. If there is a potential of 1 kV between the wires, how much energy is stored in a 10 m piece of cable? For my answer I got 5.32 J which was wrong.
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