Capacitance Definition and 874 Threads

Hi all; So the problem goes as follows: [FONT=&quot]For the circuit in the figure, what should be the capacitance C to put the circuit into resonance? What is then the RMS value of the current? What is, then, the peak value of the air-gap flux density? [FONT=&quot]Is, then, the assumption...

Homework Statement Assume that C_1= 10.0 \mu F, C_2= 5.00\mu F, and C_3= 4.00\mu F. A potential difference of V= 100V is applied across this network of capacitors. 1st picture is original (after that is when I simplified the circuit or tried to anyhow) a) find the equivalent capacitance...

1. There are two parallel plates with distance between them 10 mm. Square of each plate is 100cm2. The third metal plate of thickness 8mm is situated in parallel inside the air gap. Find capacitance of this capacitor.

Theoretically only, would a capacitor of infinite capacitance be considered an open circuit? What would it be used for in application if it did exist? The reason I am asking is because I have a homework problem where it is used with a JFET transistor in a circuit. If I can't solve the...

Hi, I'm doing a piece of (A-level) coursework into the factors that affect the capacitance of a parallel plate capacitor. After searching the internet I've come up with the following explanation for why plate separation affects capacitance: "Capacitance is inversely proportional to plate...

Two capacitors when connected in parallel give an equivalent capacitance of 9.00 pF and an equivalent capacitance of 1.55 pF when connected in series. What is the capacitance of each capacitor? in parallel: C1 + C2 = 9.00 pF in series: (1/C1) + (1/C2) = (1/1.55pF) My attempt: (C1 +...

According to its design specification, the timer circuit delaying the closing of an elevator door is to have a capacitance of 33.0 µF between two points A and B. (a) When one circuit is being constructed, the inexpensive but durable capacitor installed between these two points is...

the capacitance of two metal sphere system Homework Statement What is the capacitance of the two metal sphere system. *The question has been attached shematically. All the variables are given in the attached file, there is no missing variable. thx for any help.

[SOLVED] Capacitance and Charge 2 conducting spheres, one of diameter .400m and the other of diameter 1.00m, are separated by a distance large compared to the diameter. The spheres are connected by a wire and the system charged to a total of 7.00x10E-6C (total charge of system). How is the...

Homework Statement (a) Determine the capacitance of a Teflon-filled parallel-plate capacitor having a plate area of 1.90 cm2 and insulation thickness of 0.0600 mm. (b) Determine the maximum potential difference that can be applied to the capacitor. kV Homework Equations I THOUGHT C =...

The problem. A 2.50uF capacitor is charged to 857V and a 6.80uF capacitor is charged to 652V. These capacitors are then disconnected from their batteries. Next the positive plates are connected to each other and the negative plates are connected to each other. What will be the potential...

Homework Statement A homemade capacitor is assembled by placing two 9inch pie pants 5cm apart and connecting them to the opposite terminals of a 9V battery. Estimate A) the capacitance, B) the charge on each plate c) the electric field halfway between the plates d) the work done by the battery...

The problem. A 2.50uF capacitor is charged to 857V and a 6.80uF capacitor is charged to 652V. These capacitors are then disconnected from their batteries. Next the positive plates are connected to each other and the negative plates are connected to each other. What will be the potential...

I was hoping someone could help me approach this problem. A 2.50uF capacitor is charged to 857V and a 6.80uF capacitor is charged to 652V. These capacitors are then disconnected from their batteries. Next the positive plates are connected to each other and the negative plates are connected...

[SOLVED] Capacitance in series and parallel circuit Homework Statement Determine the equivalent capacitance between A and B for the group of capacitors in the drawing. Homework Equations Cseries = 1/Cs = 1/c1 + 1/c2 + ... Cparallel = Cp = C1 + C2 + ... The Attempt at a Solution...

Homework Statement Consider a charged parallel-plate capacitor. How can its capacitance be halved? Check all that apply. Double the charge. Double the plate area. *Double the plate separation. *Halve the charge. *Halve the plate area. Halve the plate separation...

Homework Statement In lightning storms, the potential difference between the Earth and the bottom of the thunderclouds can be as high as 35,000,000 V. The bottoms of the thunderclouds are typically 1500 m above the Earth, and can have an area of 90 km^2. For the purposes of this problem...

A capacitor is first connected to a 6.0 V battery and then disconnected and connected to a 12.0 V battery. How does the charge on one of its plates change: (a) It increases, (b) it decreases, or (c) it 1stays the same? (c) (because the charge on the plate is depending upon...

[SOLVED] Equivalent capacitance; complex circuit Homework Statement Hello, I was assigned a problem where we are supposed to find the equivalent capacitance of a circuit, and then use that to answer some other questions. However, I'm not sure how to handle this circuit...

[SOLVED] Capacitance vs. Distance of separation Homework Statement Hi, I am suppose to make a capacitance vs (1/d) graph. I understand that the relationship between the capacitance and distance between the plates is inversely proportional and that it does not produce a straight line. My...

Homework Statement Imagine that you have a light-bulb that has a resistance of about 10 Ω and that can tolerate a maximum voltage of 3 V. Imagine that you want to connect this to a charged capacitor large enough to keep the bulb glowing reasonably brightly for more than 10s. Roughly what...

Homework Statement An axon is the relatively long tail-like part of a neuron, or nerve cell. The outer surface of the axon membrane (dielectric constant = 5, thickness = 1 x 10^-8 m) is charged positively, and the inner portion is charged negatively. Thus, the membrane is a kind of...

Hi, I am having two doubts about the fringing field capacitance. 1) In most of the formulae, the fringing correction for the capacitance is written per unit length. This is ok if the length is very large; and the width and gap between the two conductors are only comparable. But is there...

dear all can anyone tell me.. if i have a transmission line passed above a metalic surface, there will be a parasitic capacitance between the line and the surface. and it induces interference how can i measure it. and if there is any refrenece about the allowable induce voltage...

Hi all... I want more information about the analogy between calculating the capacitance C and the conductance G ?

What happens if I'm changing load capacitance of oscillator from 15pF to 30pF.

Hi , i am interested to know physics behind MOS capacitors, on which iam currently working in . i started to fabriacate a MOS capacitor without using oxide (silicon dioxide) layer, i have read in articles that a MOS capacitor can be fabricated by using the native oxide layer ( naturally formed...

1. Three equal capacitors, all with values C, are in series with a battery of V volts. If the middle capacitor is changed to 2C, what will be the resultant potential across each capicitor? Express your answer in terms of V. Homework Equations C = Q / V The Attempt at a...

I have a question about coefficients of capacitance.. Specifically I'm reviewing the treatment on the subject in Chap 3.6 in Purcell's classic book on E&M. He starts out by considering a system of four conductors (actually 3 main conductors, and an "infinte" boundary condition surrounding...

Homework Statement you have a 10 volt battery and two separate circuits with capacitors. One circuit has the capacitors in series, the other has the capacitors in parallel. Find the energy stored one capacitor is 5.3 microfarads the other capacitor is 2.4 microfarads Homework Equations...

Im having trouble calculating the capacitance of a non-parallel plate capacitor where separation at one edge is d-a and the other it is d+a, assuming a<<d. I'm supposed to prove that C= epsilon_not A/d (1+a^2/3d^2). Thanks for the help.

Homework Statement A spherical capacitor is made of two insulating spherical shells with different dielectric constants k1 and k2 situated between two spherical metallic shells and separated by a vacuum gap. Geometrical dimensions of the cross-section are as shown in figure 2. Calculate the...

A spherical capacitor is made of two insulating spherical shells with different dielectric strengths, k1 and k2, situated between two spherical metallic shells and separated by a vacuum gap. Calculate the capacitance of this system. Total C = Q(free) / \DeltaV where \LambdaV is the...

Not sure where I was supposed to post this; but I think here it will hopefully get the attention of someone who can help me. I am working on a project where I have to measure capacitance very accurately. I have been given a: ASL MODEL 1055 MANUAL DISPLACEMENT METER. But I've been, along with...

Hey gang, I am doing a Mastering physics question, and it's got me stumped. >< Q: You need a capacitance of 50.0 microF, but you don't happen to have a 50.0 microfarads capacitor. You do have a 80.0 microF capacitor. What additional capacitor is needed to get a capacitance of 50 microF...

Homework Statement This is for a lab I'm doing tomorrow. We will have a 10V circuit with 4 100µF capacitors connected in series. I need to calculate the voltage drop across each capacitor. I also need to create another circuit, but I'll worry about that after I'm sure I'm doing this one...

What is the capacitance of the sun? semms like a straigtforward question but I can't seem to find any information on what it is. I'm don't know if it has been measured, or if its even possible to measure, but I would have thought a body that big and active as the sun would have an ability to...

Each capacitor in the combination shown in the figure below (C = 11mF) has a breakdown voltage of 17.0 V. What is the breakdown voltage of the combination? On either side of C is an equivalent capacitance of 40 mF (since these are parallel). I'm not certain where to go with this problem...

The figure below shows six concentric conducting spheres, A, B, C, D, E, and F having radii R, 2 R, 4 R, 6 R, 7 R, and 9 R, respectively. Spheres B and C are connected by a conducting wire, as are spheres D and E. Determine the equivalent capacitance of this system. I understand that spheres...

Homework Statement http://books.google.com/books?id=1DZz341Pp50C&pg=PA678&dq=serway+four+capacitors+are+connected&sig=iwUiJRqZDNHDGOfQfHHvh_9aQ3Y problem 41 on this link. I got the equivalent capacitance for part a. for the two capacitors with 15 and 3uF- C_{eq}=2.5uF for capacitor...

Homework Statement A 6V DC voltage source is connected across both a 5kohm resistor and a 10 nF capacitor in series. The voltage drop across the resistor is what? Reply With Quote Homework Equations The Attempt at a Solution should the charge=0 sicne by connecting wires across the...

capacitance a function of height... the question I find difficult is: A liquid-level transducer consists of two parallel plates of conductor immersed in an insulating liquid, as illustrated in this figure: http://peecee.dk/?id=71007 When the tank is empty (i.e., x=0), the capacitance...

Hi, As you know the capacitance per unit length of a standard coaxial cable is C_{coax} = \frac{2 \pi \varepsilon_{0} \varepsilon_{r}}{\ln{\frac{b}{a}}} where b is the radius of the cable and a is radius of the central conductor. . If we only want to know the capacitance of a...

Homework Statement What is the equivalent capacitance for the following schematic? Note that C1 is 11 µF, and C2 is 3 µF. http://img511.imageshack.us/img511/8051/questionzi5.png Homework Equations C_{parallel} = C_1 + C_2 + C_3 + ... + C_n \frac{1}{C_{series}} = \frac{1}{C_1} +...

Hello there I'm currently working on an EM device that should be able to measure the humidity in the ground. I cannot give too many details, but let's consider the following issue: I have a copper closed loop in which I send some current to generate a magnetic field. But there are some EM...

Homework Statement http://img509.imageshack.us/img509/8805/problem5fw8.th.png The potential difference V = 100 V is applied to the capacitor arrangement shown in the figure. Here C1 = 10 microF, C2 = 5 microF, and C3 = 4microF. If capacitor C3 undergoes electrical breakdown (i.e. becomes...

Three capacitors of capacitance 5, 7, and 2 mF respectively, are connected in series to a 1 V battery. What is the charge on the positive plate of the 7 mF capacitor? so if the capacitors are all connected to the battery... than all of them have to have a electrial potential of 1 v since...

Homework Statement A small object of mass m carries charge q and is suspended by a thread between the vertical plates of a capacitor. The plate separation is d. If the thread makes an angle \theta with the vertical, what is the potential difference between the plates. Homework Equations...

hi, all: I am going to calculate the planar capacitance, of which one plane is in different position to anther. For example: a) ****** .....*********** b) * * * * ...************** c) ...* ...* ...* ..* * ...************* '*' represents the metal plane. The...

Homework Statement A parallel plate capacitor is constructed by placing square metal sheets of side length 30 cm on either side of a sheet of polythene which is 2mm thick If the permeability of the polythene is 2.2 *10^-11 F m^-1, what is the capacitance of the system (ii)If a 50V power...