Capacitors Definition and 884 Threads

Homework Statement The sketch below is a side view of two capacitors consisting of parallel plates in air. The capacitor plates are equal in area but the plate separation differs as shown. Individual capacitors are specified with two letters, for example WX is a single capacitor. The charge on...

It's a problem were we are given the usual - 2 plates separated in air, distance D apart, each of length L, one excess +ve charge the other exces -ve charge The question then states: the magnitude between the e-field plates is: E = q/EoL, calculate the potential (blah blah..) My question...

Homework Statement Q17. Capacitors C1 and C2 are connected in series and a potential difference is applied to the combination. If the capacitor that is equivalent to the combination has the same potential difference, then the charge on the equivalent capacitor is the same as: A. the charge...

Homework Statement Given an electric potential of Vo*sin(wt). This is applied to a parallel plate capacitor of area S, separation d and capacitance C. The questions are a) What is charge Q on the plates? b) Find the electric displacement current c) Calculate the current in the wire...

A point charge of mass 0.0836 kg and charge q = +6.84 μC is suspended by a thread between the vertical parallel plates of a parallel-plate capacitor, as shown in the figure below. If the angle of deflection is θ = 22.3°, and the separation between the plates is d = 0.0221 m, what is the...

Homework Statement I encountered the following capacitor problem on a recent test and it has brought up a couple of questions about the voltage and electric field of parallel plates. In summary my questions are: 1) How is the electric field between parallel plates quantitatively related...

Homework Statement The sketch below is a side view of two capacitors consisting of parallel plates in air. The capacitor plates are equal in area but the plate separation differs as shown. Individual capacitors are specified with two letters, for example YW is a single capacitor. The charge on...

I'm a bit stuck with rectifier circuits. can anyone tell me what the function of a capacitor is in a rectifier circuit please. Thanks, Dave

What is cause of capacitor breakdown? When we combine different capacitors in series and parallel combination, how does the breakdown voltage of the system get affected?

1. Two capacitors, C1 = 60.0 nF and C2, were connected in parallel with a power supply with E = 12.0 V. The two capacitors were then disconnected from the power supply and from each other and were reconnected with the positive terminal of one connected to the negative terminal of the other...

1. 2. Homework Equations : are too big to post here, meaning, I will give you a link to my work: http://farm4.static.flickr.com/3092/2369876018_5866bfb312_o.jpg" 3. The Attempt at a Solution : that's above as well, I know what the solution IS, it's at the top righthand corner of...

I've been working through our physics book for year 12 Physics, and only just now when we've hit electronics has it really confused me. I'd like to be able to understand it before our current 2 week school break ends. Perhaps the biggest flaw of the book is that it doesn't say how it got...

How many volts would i need to make a 100uF 10V capacitor explode if i plugged it in backwards?

[SOLVED] Capacitors VERY QUICK EASY QUESTION! PLEASE HELP! Homework Statement A parallel-plate capacitor has circular plates of 8.80 cm radius and 1.50 mm separation. (a) Calculate the capacitance.

Homework Statement http://img512.imageshack.us/img512/6864/59797183jd5.png (capacitance in micro farads). Initially the switch is at the left position and capacitors C_2 and C_3 are uncharged. Then the switch is flipped to the right position. Afterward, what are the chard on and the...

"water" as a dielectric in capacitors Homework Statement Why do you think water is not commonly used as a dielectric in capacitors? K=80.4 *K=dielectric constant for water thx for any help

Homework Statement A charge Q is at the origin. A second charge, Qx = 2Q, is brought to the point x = a and y = 0. A third charge Qy is brought to the point x = 0, y = a. If it takes twice as much work to bring in Qy as it did Qx, what is Qy in terms of Q? Homework Equations My main problem...

For a capacitor not connected to a battery, why does the voltage decrease with the insertion of a dielectric. Would it be because the net electric field between the conductors is decreased?

For a circuit of capacitors...can it be generalized that when the battery is removed, each capacitor approaches the same final electric potential, regardless of whether the capacitors were in series or parallel?

Edit: I found out how to solve this but I'd still appreciate some tips (see bottom). Homework Statement Homework Equations Capacitors in series: Q = Q1 = Q2 = ... V = v1 + v2 + ... 1/Ceq = 1/C1 + 1/C2 + ... Capacitors in parallel: Q = Q1 + Q2 + ... V = V1 = V2 = ... Ceq = C1 + C2 + ...

Hi, everyone I am new around here and was wondering if anybody could answer some basic questions for me? 1. I was wondering how you would make an electrical connection or for example a direct connect from a battery to switch the electrons to be only negative or only positive. 2. If you...

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 *10-8 m) is charged positively, and the inner portion is charged negatively. Thus, the membrane is a kind of capacitor...

Homework Statement A parallel plate capacitor with the separation between the plates as 'd' has its lower plate dipped in water. Before dipping, the lower plate has charge Q, while the upper plate has charge 2Q. Let K be the dielectric constant of water. What will be the final charge on the...

[SOLVED] Infinite capacitors Homework Statement Consider the infinite chain of capacitor problem: Each of the capacitors (C) below in the infinite series circuit has a capacitance of 6.34 mF. What is the capacitance of a single capacitor that can be connected between points A and B to...

Homework Statement How does the loop rule apply to capacitors? I can't find any examples of circuits containing capacitors and resistors where the loop rule is used. I know the loop rule measures potential differences, but I'm not quite sure if that has anything to do with capacitors? All...

Capacitors...Please HELP! Homework Statement An uncharged capacitor is connected to the terminals of a 1.02 V battery, and 1.69 μC flows to the positive plate. The 1.02 V battery is then disconnected and replaced with 6.78 V battery, with the positive and negative terminals connected in the...

Homework Statement Reduce the circuit as much as possible. All resistors have R and all capacitors have same C. Homework Equations The Attempt at a Solution http://photos-a.ak.facebook.com/photos-ak-sctm/v183/24/75/1238100168/n1238100168_30112052_7338.jpg And this is my...

[SOLVED] capacitors yet another question - please help Sir, I have uploaded my two questions along with my solution. Can you just tell me if my solution is correct. The link is: http://img412.imageshack.us/my.php?image=capcitorsao1.jpg

there are two parallel plate capacitors C1 and C2 connected in series across a battery of emf V with a switch S. The capacitor C1 has some initial charge q0 while C2 is uncharged. I want to know will the final charges in the two capacitors be same? if yes, why?

The problem: A capacitor has the capacitance 35nF, the tolerance is max 10V. You have to put 30V over the capacitor . How many capacitors of same kind do you need if you want to achieve same C(35nF) that tolerate 30V? I have translated it from swedish to english, sorry if my english isn't so...

Capacitors - please, need urgent help! Homework Statement I've attached the circuit diagram but it's basically a cell connected in series with a 10kohm resistor, and then a 20microfarad capacitor and 22kohm resistor connected in parallel. The capacitor begins charging at t=0. Show that the...

Homework Statement What is the potential difference across C2 when C1 = 5.0 µF, C2 = 15 µF, C3 = 30 µF, and V0 = 24 V? http://img503.imageshack.us/img503/9994/capacitanceqb1.jpg Homework Equations C = Q/V The Attempt at a Solution I calculated total capacitance of C1 and C3...

Homework Statement Capacitors A and B are identical. Capacitor A is charged so it stores 4J of energy and capacitor B is uncharged. The capacitors are then connected in parallel. The total stored energy in the capacitors is now ____.Homework Equations U = q^2/2C The Attempt at a Solution Ok...

Homework Statement http://img158.imageshack.us/img158/9616/capacitanceqj8.jpg C = 12pF Homework Equations The basic equations for capacitance in series and capacitance in parallel, which I assume everyone knows The Attempt at a Solution Well I calculated the two capacitors in the...

So being fresh from school, a lot of times as students we dealt with unrealistic values for caps and inductors. I remember doing a textbook problem where a cap's value was 1 F. Now that I'm in the real world. What is considered to be a realistic value? To push the question further, I see a lot...

Four capacitors are connected as shown in the figure below (C = 16 mF) (a) Find the equivalent capacitance between points a and b. (b) If V(ab) = 16.5 V, calculate the charge on the the 23.0 mF capacitor. This is repeated for each capacitor in the circuit. For the sake of simplicity, C =...

A 9.0 μF and 4.0 μF capacitors are connected in parallel... Hi, I understand how to do most of this question, I completed "A", but I am confused with question "B". I think that the series capacitor would have full voltage going across it and that the parallel capacitors would have less...

My knowledge on how inductors and capacitors operate in AC/DC is a bit shaky. My textbook and online material don't help my understanding, so I am hoping someone would be able to explain it more clearly. In DC I know that capacitors store energy and charge up by time constants and then...

Two capacitors, C1 = 20 µF and C2 = 5.0 µF, are connected in parallel and charged with a 150 V power supply A.) Energy Stored I found to be is 2.81*10^-1 J B.)What potential difference would be required across the same two capacitors connected in series in order that the combination store...

Homework Statement We begin with two capacitors c(1)=6 microFarad and c(2)=3 microFarad in parallel which are connected to V=24Volts. The charged capacitors are disconnected and is being connected to each other on opposite signs (+ to -). How much Energy is got wasted in the process...

Say we have a parallel plate capacitor which is charged using a DC source. In my understanding there is a build up of excess positve and negative charge on opposing plates of the capacitor (depending on which plates are connected to the positive and negative terminals of the DC source)...

consider the plates ofa capacitor suppose u just have two capacitors connected in series then consider the two plates not connected to the battery that form a seprate system .one of them has +Q and the other -Q then how is that there is no flow of charges between them because one of them...

Ok, I have 2 homework problems that I don't really know where to even start. The first one is: A homemade capacitor is assembled by placing two 15-cm pie tins 20 cm apart and connecting them to opposite terminals of a battery. Calculate the following: a) the capacitance b) the charge on each...

Hi everyone, This is my first post on the forum, but I have used the site many times for previous help. My professor started us on capacitors today and just had time to give us a bunch of equations without much explanation of how to solve problems. A problem he gave us to solve so as so:A 20.0...

Hi. If I had 4 capacitors and three were in parallel while the last one was in series with on of the parallel ones would the charge on the c and d capacitors be the same? Capacitors Cc and Cd are in series while being in parallel with Ca and Cb.

Homework Statement Examine the figure shown. Note that C3 = 10.5 uF, and C1 = C2 = 2C3. Also the battery voltage is Vb = 39.0 volts. Homework Equations What is the equivalent capacitance for this arrangement? How much charge is stored on C1? The Attempt at a Solution C2...

Alright this has been tickling me for the past couple of days. First, I know that the E under an infinite sheet of charge is: E = \frac{p_s}{\epsilon_0}\hat{z}

Can anyone tell me the difference in capacitors. Such as the quality control in producing it, the testings, the specs (low esr), brand names, and if its worth buying a 30 dollars 1.5 farad capacitor v.s. a 170 dollars 1 farad capacitor. thanks

Homework Statement If the switch is flipped from position A to position B, what's the charge on capacitor C1 and C2? Please see the attachment below Homework Equations Q=CV The Attempt at a Solution I know that the capacitor C1 gains potential difference of 200V (=...

The voltage from point a to point b is +28V. Each capacitor has a capacitance of 4.00uF (microfarads) What is the best way to calculate the charge on each capacitor?