Capacitors Definition and 884 Threads

Homework Statement Problem taken from : Fundamentals of Physics , Volume 2 ( 7th edition) Halliday , Resnick , Walker In the figure, a 20.0V battery is connected across capacitors with capacitances C1=C6=3.00mF and C3=C5=2.00C2=2.00C4=4.00mF What is the equivalent capacitance Ceq of...

Homework Statement When a battery is attached to a capacitor, why do the two plates acquire charges of the same magnitude? Will this be true if the two conductors are different in size or shape? Explain. Homework Equations Q=CV and C=epsilon x A/d The Attempt at a Solution I wasn't...

Homework Statement Capacitors C1 = 6.99 mF and C2 = 1.72 mF are charged as a parallel combination across a 219 V battery. The capacitors are disconnected from the battery and from each other. They are then connected positive plate to negative plate and negative plate to positive plate...

Homework Statement Two uncharged metal spheres, spaced 15.0 cm apart , have a capacitance of 24.0 pF. How much work would it take to move 12.0 nC of charge from one sphere to the other? Homework Equations V = Q/[4(pi)eor] (delta)K + (delta)U = 0 *I think The Attempt at a Solution...

Homework Statement I don't get how this circuit is a short-circuit as there is a resistor connected in this circuit, which is opposing the flow of current. How can both terminals of the capacitor be connected to earth, shouldn't one be connected to the positive and the other to the...

Homework Statement Hello, guys! Here I am again asking for your help...This is question number 2 from http://www.studyjapan.go.jp/en/toj/pdf/007.pdf" 2) Consider the circuit shown in Fig. 5, consisting of a battery of voltage E, a switch S, and a parallel-plate capacitor with capacitance C...

time constance "capacitors" electricity was looking over my physics electricity i got some question actually i just forgot them. v(t)=V(1-e^(-t/RC)) where RC is the the time Constance, 1) i am not sure what the time Constance means. 2)If R is increased by a factor of 2 what in theory...

[PLAIN]http://img340.imageshack.us/img340/4058/15244008.jpg so C = epysilon A / d C= (8.85x10^-12 x 5.0x10^-3)/0.002 = 2.2125x10^-11 so the capacitance of the capacitors is ^ then with a dielectric where k = 3 can i use this equation C = epysilon A k/ d, just putting the k next to...

Most arrangements I've seen have a power source hooked up to a resistor hooked up to a capacitor. Like this http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capchg.html Why? I mean, why can't we directly hook the capacitor to the emf? sounds stupid, I know. Also, resistors follow...

Homework Statement you and your laboratory team have been given a project by your electrical engineering professor. Your team must design a network of capacitors that has an equivalent capacitance of 2 microF and breakdown voltage of 400V. The restriction is that your team must us only 2...

Homework Statement Two identical capacitors that have been discharged are connected in series across the terminals of a 100V battery. When only on of the capacitors is connected across the terminals of the battery, the energy stored is U. what is the total energy stored in the two capacitors...

any body who can tell me how to calculate the values of resistors and capacitors in single pole double throw circuit?

I've been working around with this little problem for some weeks now and I think I have most of it figured, but there are some points that keep confusing me, its long time since I finished college and I have forgotten most of the maths. So any pointers on mistakes or indeed if my maths is...

Homework Statement A battery of 15V supplies two capacitors via a two-way switch. Initially the switch is to the left hand side, calculate the charge on the 1mf capacitor when the switch is switched to the other side (as shown in diagram). Homework Equations Q=VC, Total Capacitance in...

Homework Statement In a capacitor, is the potential difference at the battery causing an electric field flow inside the wire connected to the two plates of the capacitor? But like at the negative terminal of the battery, the potential is zero, so does that mean that the negative plate of the...

Homework Statement Three capacitors C1–C3, all initially uncharged, are placed in the circuit shown. The capacitances are C1=8.9 μF, C2=20 μF, C3=12.2 μF, and the battery voltages are V1=18 V, V2=10 V, V3=18 V. What is the magnitude q1 of the charge on capacitor C1 once equilibrium has been...

Homework Statement The 50Volts is going through 3 capacitors. C1 = 4.0 µF, C2 = 8.0 µF, and C3 = 9.0 µF, The URL below is the image of how the capacitors are connected: http://www.webassign.net/hrw/26_27.gif For each capacitor i need to find the charge, the potential difference and the...

Please Help! Finding kilowatt hours from parallel capacitors Homework Statement A parallel-connected bank of 5.00 µF capacitors is used to store electric energy. What does it cost to charge the 2900 capacitors of the bank to 45,000 V, assuming a unit cost of $0.03 per kW·h? Homework...

Homework Statement The area of the plates of a parallel plate capacitor is 1 m2, the spacing between the plates is 10 cm, the potential difference between the plates is 1500 V. After beign charged, the plates are disonnected electrically from the surroundings. The plates are then pulled...

Just a short concept question for understanding... I understand that a capacitor stores a charge, However I'm told that capacitors can be used to store up a charge and release it very quickly. How does this energy get released is what I don't understand. To my understanding of a...

Homework Statement The capacitors in the figure are charged and the switch closes at t=0s. At what time has the current in the 8 ohm resistor decayed to half the value it had immediately after the switch was closed? (The circuit looks something like this; 2 capacitors are in series at...

Homework Statement Two capacitors, one with C1=2pF and V1=30V, and the other with C2=3pF and V2=20V are connected to each other through a switch (positive end of one connected to the negative end of the other). The other end of each capacitor is kept open. What happens to V1 and V2when the...

Homework Statement Determine the equivalent capacitance (in terms of C0) between points x and y of each network of capacitors shown. Homework Equations For capacitors connected in parallel, Ceq=C1+C2+...Cn For capacitors connected in series, Ceq=1/C1+1/C2+...1/CnThe Attempt at a Solution...

Homework Statement The two-parallel-plate capacitors shown, C1=C and C2=KC, have identical plate area and plate separation. The switch S is closed, connecting the capacitors to a constant voltage power supply providing a potential difference of V. The capacitors are allowed to fully charge...

Homework Statement When a does a capacitor increase in charge linearly? Homework Equations C=Q/V The Attempt at a Solution If I am correct, it is when the capacitor is being directly charged by a battery. When there is a resistor, we get an RC circuit scenario where capacitor...

what is the resistance experienced by the capacitors in the circuit (diagram) ? i am actually supposed calculate the time taken during the discharging of capacitor using this formula - V=V_oe^{-\frac{t}{CR}} what should the R there be ? Since they are connected in parallel , would...

Homework Statement A parallel plate capacitor is charged by a battery to 20 V and then disconnected . A simple pendulum consists of a metal bob which is suspended by a nylom thread is placed in the middle of the plates of the capacitor . Then the bob is oscillated towards the negative plate...

Homework Statement A capacitor C1 (the one on top in the diagram) of capacitance 4 mu F is charged until its charge is 200 mu C and another capacitor C2 (the one below) of capacitance 3 mu F is charged until its charge is 300 mu C . Then both capacitors are connected in the circuit as shown in...

The questions says an isolated conductor has charge Q ... is isolated the same as uncharged ? If so , how can it have charge Q ? Also , if an earthed conductor is brought near a positively charged capacitor , some of the negative charges will move to the +ve charged capacitor and vice...

1. Capacitors C_1 = 13 uF and C_2 = 26 uF are each charged to 20 V, then disconnected from the battery without changing the charge on the capacitor plates. The two capacitors are then connected in parallel, with the positive plate of C_1 connected to the negative plate of C_2 and vice versa...

Homework Statement Each capacitor is 5 \mu F and V_{ab} = 30 V. I'm trying to find out the charge on each capacitor. Homework Equations C = \frac QV C_{eq} = C_1 + C_2 +... for capacitors in parallel. C_{eq} = \frac{1}{\frac{1}{C_1}+\frac{1}{C_2}+...} for capacitors in series...

Say there are 2 capacitors of different capacitance connected in series to a supply of 3 V . Would the charges in each capacitors be the same ? Can i say that charges are analogous current ? If so , since current is the same throughout the circuit , hence the charges in each capacitor is the...

Arrangment as is follows a's are there as place holders to keep the diagram intact while posting, all capacitors have = capacitance C ___||______||____||____||... aaaaaa|aaaaaaa|aaaaaa| aaaaaa=aaaaaaa=aaaaa= ... aaaaaa|aaaaaaa|aaaaaa| ____________________________ The question...

Homework Statement An isolated cylindrical capacitor consists of two concentric conducting cylinders of length L and radii a and b. The inner and outer conductors carry +Q and -Q, respectively. a. Determine the electric field between the conductors. b. Determine the electric potential...

Homework Statement If you were given an enclosed box, containing two 2000uF capacitors, which were either joined in series or in parallel, suggest, with a reason, how you would determine which way they were connected. Homework Equations C = C1 + C2 in parallel 1/C = 1/C1 + 1/C2 in...

Homework Statement In a system of parallel capacitors both have the same (delta)V. is it true that in that system, with power supplied by a battery of 9V, that each has a (delta)V of 4.5V? Or do they each have a (delta)V of 9V? Homework Equations The Attempt at a Solution

Homework Statement In Fig. 25-22, each capacitance C1 is 7.2 µF, and each capacitance C2 is 4.8 µF (a) Compute the equivalent capacitance of the network between points a and b. (b) Compute the charge on each of the three capacitors nearest a and b when Vab = 450 V. (c) With...

Homework Statement I have some results of my lab here and I just want to check to make sure they make sense. The lab write-up refers to this part of the experiment as "capacitors in parallel" but I think they are actually in series (either that or we connected them incorrectly). Here is...

Homework Statement Fig. 1 and 2 show a dielectric slab being inserted between the plates of one of two identical capacitors, capacitor 2. Select the correct answer to each of the statements below (enter I for `increases', D for `decreases', or S for `stays the same'). 1. In Fig. 2...

In the arrangement shown, find the necessary relationship between the capacitances of the four capacitors in order that when a voltage is applied across terminals a and b, no voltage difference is set up between terminals c and d. Would this arrangement work for the case of the voltage applied...

Homework Statement Two large area parallel plate capacitors, labeled P and N, are connected as shown in the figure below. The charge on each plate is indicated in the figure, in μC. I. The capacity of N (on the right) is 27.5 μF. Calculate the capacity of P. 1.34×10-5 F (Correct)...

Homework Statement Exactly from my homework: "It is assumed that for capacitors 'in series' that each capacitor carries the same charge Q. Give a physical argument for this. Why does this make sense?" Homework Equations The Attempt at a Solution I've tried searching for the...

I mean like...20KV or above...I've seen their energy density and specific energy is pretty high compared to batteries (I hope I'm right)...so why not use them for battery replacement in vehicles?

[b]1. First you fully charge a capacitor (C = 6.4 µF) with a 12V battery. Then you disconnect the battery and discharge the capacitor through a resistor (R = 3 Ohms) and an inductor (L = 2.0 x 10-3 H) in series. [b]2. What is the charge on the capacitor when you begin discharging at t= 0...

Homework Statement A 12-V battery is connected to three capacitors in series. The capacitors have the following capacitances: 4.0uF, 14uF, and 33uF. Homework Equations R = V/I The Attempt at a Solution I'm thinking you add the capacitances since they are in series (do i need to...

I am doing a problem about equivalent capacitors and I am not sure how I should handle this arrangement. How does the horizontal line (with the arrow) change whether the capacitors are in series or parallel? I know without that line you can condense the pairs of capacitors as if they were in...

Why are capacitors used to give pules of very high potential difference (for e.g. x)?...what's the advantage? The source charging the capacitors should have potential difference less than x if capacitors have an advantage here; for e.g. with a source x/2, we can getting a potential x...is this...

Hi Everyone. I actually had two distinct questions relating to circuit analysis and design. The first is theoretical and the second is a question about what I've observed on other circuits. I'm reading some undergraduate EE books (I'm an EE student in Canada) and I've gotten to the point where...

Homework Statement The plates of a capacitor have an area of 0.4m2 and are separated by a distance of 0.5 micrometers. The material between the two plates is air with a dielectric constant of 1.0 One plate of the capacitor is given the charge of 4\muC. The voltage across the capacitor is, in...

I have 23 450V 1600uf electrolytic capacitors and was wondering if I could use them in a series? If I were to put them in a series, would they act like a single 10,350 volt 72.727 uf capacitor? Or would they melt/fail/leak/explode if I tried to use them that way? Any information is helpful! Thanks!