Capacitors Definition and 868 Threads

Consider a two identical capacitors connected in parallel and connected to a battery. The battery is removed and then a dielectric is inserted between one of the capacitors. Why will charge flow from one capacitor to the one with the dielectric? I know the "potential differences in the...

If I have a cube made out of capacitors, that's one capacitor for everyside for a total of 12 capacitors. Each capacitor is C=4.71 pF. How would I even begin to go about finding the total capacitance?

Hi, I am new to this website. I am having troubles in designing a common source amplifier with a voltage gain, Av=26 dB (no bypass capacitor) and a gain of 40 DB (with a bypass capacitor) and a frequency of 100-1000HZ. Can anyone please guide me to calculate the value of the bypass capacitor...

Good day everyone. Please help with these questions. The circuit is a series of 3 capacitors with a battery. C1 = C C2 = 2C C3 = 3C How do you find the voltage across the first capacitor in a series of 3? How do you find the charge Q on the first capacitor? How do you find the...

I don't know how to start solving attached problem (3.126 from Irodov) because I can't identify any series or parallel connection between capacitors. I came to an idea that I should "break" capacitor C3 into two capacitors and then get two series and one parallel connections. Any ideas?

Hello guys. Please look at this, it's a VERY SIMPLE problem and I've almost solved it, but sth is not right... It's a simple problem but i am confused regarding the method that I'm supposed to use to solve this kind of problems. So the problem is: V1 , V2 , V3 and V4, E1, E2 are given. They...

Hello peeps, I am currently studying capacitors and simple electronic circuit design, but I am getting the feeling I am not quite fully understanding things because i keep forgetting key concepts and how they fit together in an abstract sense. (please forgive the long post, its an attempt to...

Hi, When capacitors are connected in series then why charge remains same on each capacitor and why voltage differs on each capacitor? Regards, Rizwan Khalil 923214120424 :smile:

Ive tried so many different ways using the formula for series capacitors and Q=CV and I've had no luck solving this problem. There must be some rule (or trick) I am missing involving combing C12 and C13 that I am completely missing. Can anyone offer any insight into solving this problem?

A 50 pF capacitor and a 200 pF capacitor are both charged to 2.6 kV. They are then disconnected from the voltage source and are connected together, positive plate to positive plate and negative plate to negative plate. Find the resulting potential difference across each capacitor. I can find...

Can anyone help me out with this? I like your word picture of the capacitor circuit. I've added GND and Vsupply to complete the circuit. I've apppended numbers for each plate and wire. I will be referring to each plate/wire/air numbers throughout the message. GND - wire1 - plate1 - air1 -...

Anyone know of a place that sells 10 farad capacitors rated at 20k volts

Question asks: Two spherical conductors of radius 0.01m are placed with their centres 0.1m apart. Calculate the capacitance (C) of this system. I can't do it like a parallel plate capacitor can i? and its not a traditional spherical capacitor is it? So I'm going to have to do it the long...

Two capacitors are identical, except that one is empty and the other is filled with a dielectric ( k= 5.00). The empty capacitor is connected to a 6.0 V battery. What must be the potential difference across the plates of the capacitor filled with a dielectric such that it stores the same amount...

if there are two capacitors in series and the capacitance of one is known how would i find a value for the other?

I have a question that has confused me a little, A circuit is set up with a 10v battery,a 100 micro farad capacitor and a variable resistor. The capacitor is left to charge with the switch closed. After the switch is opened the variable resistor is adjusted to maintain a current of 100...

A 10 micro farad capacitor is fully charged by connecting a 24v battery. How much energy is stored in the capacitor? How much energy would be required from the battery to charge the capacitor to the 24v level? Explain why the answers are different.

Two capacitors in series are charged by a 12.0-V battery that has an internal resistance of 1.00 ohm. There is a 5.00-ohm resistor in series between the capacitor, as shown in this figure: What is the time constant of the charging circuit? I know time constant, tau, equals R*C, but I...

Capacitors, Hard Problem Four identical capacitors are connected with a resistor in two different ways. When they are connected as in part a of the drawing, the time constant to charge up this circuit is 0.67 s. What is the time constant when they are connected with the same resistor as in part...

A battery of potential V stores charge q on a combintation of two identical capacitors. What are the potential difference across and the charge on either capacitor if the capacitors are (a) in parallel (b) iin series? I know the answers to these questions but I'm trying to understand the...

A capacitor, a resistor, and another capacitor is connected in series. The first capacitor, C_1, has an initial charge of Q_0, and C_2 is initially uncharged. The switch is flipped at t=0, what is the charge on each capacitor as a function of time? So I thought Q_1 =...

Hello everyone, I'm confused on why I'm missing this problem. Here is my work and problem: http://suprfile.com/src/1/25o5ux/lastscan.jpg Any ideas? I know you add up capitors in series like (c1)(c2)/(c1+c2) in parellel c1 + c2 +...+cn

Silly question, but I can't find the answer anywhere in my notes. When you have a capacitor with two parallel slabs of dialectric (equal thickness, different dialectric constants) in between the plates of a capacitor, would you find the capacitance by linear superposition (I wouldn't have...

From Griffiths again! A large parallel plate capacitor with uniform surface charge \sigma on upper plate and -\sigma on lower is moving with a constant speed v. Q1]Find the magnetic field between the plates and also above and below them. My work: For a surface charge distribution: \vec K =...

1. can someone please explain the idea of a dielectric to me (or at least give me a link that explains it in laymans terms) - all i understand is that its placed between two capacitors and it increases their capacitance (by the factor of K). what does it do to the voltage? and the charge...

any ideas on solving this? (the capacitors are initially charged) I have some ideas but `im not sure which one is correct... I know that Q remains the same between C1 and C2, so that V1C1 + V2C2 = v1'C1 + V2'C2. From there, i don`t know if i can do the same thing for capacitors C2 and C3. I...

hey guys, i did these problems out of my book for review and it does not give me the answers. So if you could please, tell me which ones I've got incorrect and if you don't mind explaining and writing down the correct answer for the wrong answer will be awesome! Thanks in advance. (BTW, I think...

Does anyone know the purpose of the capacitors circled in red in the file attached? What are their functions in the circuit? Thanks!

I have a question that is confusing me perhaps one of you can help me. If I hook up a constant potential difference to a capacitor and place a dielectric inside of it, will the electric field decrease even if the plate separation remains constant? I think that the capacitance will increase as...

Hello. I have a brain fart and this combination circuit has me stumped. Here is a crude representation of the circuit. I had no problem finding the total capacitance (1.34uF), but the second part asks you to find the charge on each of the capacitors, assuming that the potential difference...

I got a question that reads: Supoose a 10khz signal with an amplitude of 1 volt is applied across a 1k(ohm) trdidyot snf s 0.25 microF capacitor which are connected in series. What is the voltage drop across the capacitor? I tried to use the equation Vc(t) + Vco*cos(omega*t) in which i got...

Hello, I've read an EMP subject on this site a few minutes ago, it' didn't help me anything at all. My buddy had built an EMP with Capacitors and no explosive materials, how would i do it? Im thinking of building one, without explosives, because that's just too dangerous and not a smart...

Hello, I was hoping to get some help with this problem.. Find the equivalent capitance between points a and b for the group of capacitors connected as shown in the following figure if C1=5.00µF, C2=10.00µF, and C3=2.00µF. I appreciate the assistance. :smile: ~Val [diagram attached]

A small plastic ball of mass 6.70×10-3 kg and charge +.0150 uC is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in equilibrium, with the thread making an angle of 30.0° with respect to the vertical. The area of each plate is 0.0200 m^2. What is the...

The capacitance measurements of “Fuel Gauging Tubes” (FGT) that are composed of carbon composite inner and outer tubes shows unacceptable level of variations and I need to reduce the variation of capacitance. I would like to know what are the contributing factors to capacitance variations...

http://www.tecategroup.com/e-sales/maxwell_supporting_data.htm i found this interresting in the application notes..about half way down..

I have a nasty problem here which I have been working at for a while but keep getting rubbish answers. I have tried using: E = surface charge density/(dielectric constant * Epsilon0 (8.85*10^-12) but I get a dielectric material which has a lower dielectric constant than air. I really...

Hi there! I have great problem in tackling some problems on this topic, I hope you can help me. :confused: 1. For a V-t graph, it has the shape of a sine curve but well beyond the x-axis. It has 3 complete cycle in 6ms as shown in the graph. Notes: V is the potential difference applied...

hi... I'm very glad if you all can help me solving my problem..i want to know what the uses of capacitors in modern integrated circuit chip..i had searched for it in many books but what i found is the uses of capacitors in usual circuit... so please help me... thanks

If 26 V is applied across the following network, calculate the voltage across each capacitor: Ignore the dots, it's just spaces between the two ends ___ 3.00 uF _____ 4.00 uF |.......| |.......| __________2.00 uF______ |.......| |.......| |.......| So I know that for capacitors in...

I'm completely boggled by this problem: "A 12.0V battery is used to charge a 4.00μF capacitor. A switch is then thrown disconnecting that capacitor from the battery and connecting it to a circuit with two capacitors (3.00uF and 6.00μF) connected in series. What are the final charges on the...

Hi, I understand generally how to do problems with capacitors, but I am faced here with a problem about 2 capacitors and I am not sure what the appropriate calculations are for combining their capacitance, etc. Here is the problem: A 7.7 uF capacitor is charged by a 125-V battery and then...

Hello Everybody, How are you? Could anyone please help me with this Parallel Plate Capacitor Problem, Here is the Question in detail Click on the link for a detailed explanation of the question: http://online.physics.uiuc.edu/cgi/courses/shell/phys112/summer04/tmau.pl?04/06 This is a...

Hello Everybody, I am new to this site, However I have a quick question about the two spherical capacitors. Please take a look at this link here: http://online.physics.uiuc.edu/cgi/courses/shell/phys112/summer04/tmau.pl?04/05 This is a problem about two spherical capacitors and I...

Err, another stupid question, When the microcontroller chip is connected by 5V DC power supply to input high voltage(Logic 0) for active low input pin, so that when the switch is pressed, a low voltage is input(Logic 1) into the pin, why do we need to connect a capacitor in parallel to the...

Hello All, I'm a novice when it comes to electronics and I have what I think is a really basic qoestion concerning capacotors. If you have a capacitor and a battery in a circuit so that the battery is set to charge the capacitor, is the capcacitor charged by the voltage potential in the...

How do I find the charge on each capacitor? -------c1---------------------- |......|...| |......|...| V......c2...c3 |_______________|__________| I know how to find the total charge which would be q=Ceq*v but I don't know how to find the charge on each individual capacitor.

Hey Guys, I was just doing a question on capacitance and i was wondering since capacitance is usually determined by a fixed formula which is dependent on the di electric material that is contained within a capacitor.. However it struck me that a capacitor does not neccesarily contain...

Can some one please help me with this question: A 20 microfarrad capacitor is charged to 10V and isolated. A second uncharged 20 microfarrad capacitor is now connected to the plates of the other. The capacitors rapidly come to the same pd between their plates. What is the charge on each...

1. For http://www.pen.eiu.edu/~cuemc4/circuit.bmp picture.. Calculate the potential at point D. 2. I 15-V battery is connected to three capacitors in series. The capacitors have the following capacitances: 4.5microFarads, 12.0microFarads, and 32microFarads. Find the voltage across the...