Plates Definition and 591 Threads

As I have understood it, it is a classical problem to show that the force between to capacitorplates is \frac{1}{2}\epsilon _0 E^2 A, which is at first counterintuitive since one should think that it is QE = \epsilon_0 E^2 A. I am pondering that question a bit now and i saw the MIT lecture...

Homework Statement Two very large parallel plates are oppositely and uniformly charged. The field between the plates is 1.3×10^6 N/C. How dense is the charge on each plate ( in microC / m^2 ) Homework Equations The Attempt at a Solution

Hello, Do you have any idea where I could find my formula for the Grashof N°, Nu and Heat? Thank you very much for your help Steve

Homework Statement In the figure, a uniform, upward-pointing electric field E of magnitude 2.00×103 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 4 cm and separation d = 2.00 cm. Electrons...

Can anyone direct me to manufacturers/suppliers of the complete setup for the Polarization by Quarter-wave Plates Experiment? I have already found one: PHYWE Systeme (Germany) - http://www.phywe.com/461/pid/26331/Polarisation-durch-Lambda-Viertel-Plaettchen-.htm" , but I need at least two more.

Homework Statement at some instant the velocity components of an electron moving between two charged parallel plates are vx = 1.20 105 m/s and vy = 3.70 103 m/s. Suppose that the electric field between the plates is given by Evec = (120 N/C) jhat. (a) What is the electron's acceleration...

Homework Statement Two large conducting plates are separated by a distance 'L', and are connected together by a wire. A point charge 'q' is placed a distance 'x' from one of the plates. Show that the proportion of the charge induced on each plate is 'x/L' and '(L-x)/L'. (Hint: pretend the...

Homework Statement A flat circular disc of radius 1.0m is rotated at an angular velocity of 0.65 rad/sec over a fixed flat surface. An oil film separates the disk and the surface. If the viscosity of the oil is 16 times that of water (20 degree C) and the space between the disk and the fixed...

Two parallel metal plates are separated by 1.5 cm and are maintained at a potential difference of 1200 V. A proton, initially at rest, is released from the poisitive plate. When it reaches the negative plate its speed is : So i know that potential energy is Vq. So i went 1200 V x 1.602 x...

the electric field between two plates . plates have an angle with each other. first plate has zero potential and the second plate has a V potential. i guess i must use laplace equation on cylndric coordinates but i couldn't find the answer. http://img85.imageshack.us/i/adsztw.jpg/

1. Positive and negative charges are distributed evenly in two parallel plates with width "w". The density of the positive and negative charge is +\rho and -\rho. Assume that the length of the plates at y direction is \infty (a) Find the electric field in the plates (b) Let the electric...

Homework Statement We have two vertical plates with the surface area of A. The charge of the left one is -(Q-q), while the charge of the one on the right is +Q. The left plate is held stationary. The question is, what is the force pulling the plate on the right side? The plates are made of...

For any capacitor, whose 2 plates or conductors are being held by a battery to a constant potential difference of V volts, there is a force of attraction between the plates, since they are oppositely charged. What is the force that 'holds' these conductors at their respective positions i.e. what...

Homework Statement Four identical metallic plates, each of area A, are seprated by a distance d as showen in the Figure. Plate 2 is given a charge Q. Plates 1 and 4 Both are earthed. Homework Equations Charge Distribution i.e. Charge on each Plate and On each Side of the Plate. Will the Outer...

hello i had a question bothering me very much, A dielectric slab is inserted between the plates of an isolated capacitor.The force between the plates will a)increase b)decrease c)remains unchanged d)becomes zero ... ans given:(c) I have 2 cases 1)charged with battery, removed...

Homework Statement A 7kg plate with a radius of 1.4m is rotating at 63 rad/s around an axis perpendicular to its center. Another plate that is not rotating is dropped onto the first plate and their centers align. The second plate is 5kg, with a radius of .8m. What is the angular velocity of...

Homework Statement Determine the work required to move the plates of an ideal parallel plate capacitor from a separation distance of D to an integer multiple of D, (assume only one moves for simplicity). The each plate has an area A. Homework Equations F = q^2 /( 2 e_0 A) field strength...

Homework Statement A uniform, upward electric field E of magnitude 2.00x10^3 N/C has been set up between two horizontal plates by charging the lower plate positively and the upper plate negatively. The plates have length L = 10.0 cm and separation d = 2.00 cm. An electron is then shot...

My book says that if a license plate must have 3 letters, and 4 numbers, when repetition is allowed, and no restriction is placed on the order of letters and numbers, then the amount of possible license plates is: \begin{pmatrix}7 \\3\end{pmatrix}10^{4}26^{3} \begin{pmatrix}7 \\3\end{pmatrix}...

"the sum of the force from the top plate and the force from the bottom plate always equals the same amount"...as shown here: http://www.regentsprep.org/Regents/physics/phys03/aparplate/ I mean, if a charge was placed at different places (ie distances) between 2 point charges, the net force...

Hey asume i have conected up parallel plates but of different areas with a given potential difference ie battery, what hapens 2 the plates actualy i expect a uniform field, but how can we obtain that since we would require same potential on each plate! and secondly i expect both plates to...

If two plates of area A and separation d contain liquid in between with angle of contact 0 degrees, then what is the amount of force required to pull the two plates apart? How do we derive this??

Hi there, I'm wondering if anyone has any analysis or sources to help me understand how a Fresnel zone plate can be implemented on a curved surface, and the corresponding diffractive efficiency and focal length?? Thanks!

Homework Statement Two square metal plates are placed parallel to each other, separated by a distance d= 2.34 cm. The plates have sides of length L= 0.750 m. One of the plates has charge Q=+ 2.70 x10-3 Coulombs, while the other plate has charge -Q. What is the magnitude of the electric field...

Homework Statement An AA battery (1.5 V potential) is connected to a parallel-plate capacitor having 6.00cm-diameter plates spaced 4mm apart. How much charge does the battery move from one plate to the other? Homework Equations V=Q/C C=A\kappa\epsilon/dThe Attempt at a Solution Plugged in...

I'm not sure if this qualifies as a 'homework question'. There is no specific problem...I have a question about something in the text. I posted in 'Classical physics' with no luck. Maybe someone can help me here? It gives the situation of a conducting plate with charge density sigma 1 on...

Homework Statement A capacitor consists of two plane parallel plates, separated by a distance d. The space in between is filled with a uniform charge density J. Find the electric field at a point x away from the positive plate when a potential difference V is applied. Homework Equations...

I'm not sure if this qualifies as a 'homework question'. There is no specific problem...I have a question about something in the text. It gives the situation of a conducting plate with charge density sigma 1 on each side. The E field on each side due to the conducting plate is = sigma...

Homework Statement A pair of oppositely charged, parallel plates are separated by a distance of 5.0 cm with a potential difference of 500 V between the plates. A proton is released from rest at the positive plate, and at the same time an electron is released at the negative plate. Neglect any...

Homework Statement 1. If two plates, 1.0 cm by 1.0 cm, with charges of −2.30 µC and +2.30 µC, what is the magnitude of the electric field at b? +++++++++++++ ...b ----------------- 2. A uniform electric field of strength E = 4.80×10^4 N/C is observed in the region adjacent to a large...

Homework Statement A set of parallel conducting plates are separated by .05 m. When the plates are fully charged to a potential difference of 20 V, how much work would have to be performed to move a proton from the negatively charged plate to the positively charged plate? My second question...

Homework Statement Determine the potential 1.0 mm from the negative plate of a pair of parallel plates separated by 4.0 mm and connected to a 24 V battery. Homework Equations w = EPEa - EPEb v = kq^2/r^2 The Attempt at a Solution I'm not exactly sure how to start. Can someone tell...

Homework Statement I'm having a problem with the circuit in the attached diagram. I am looking for the charge on the plates of the capacitor a long time after the switch is closed. Homework Equations The Attempt at a Solution I found the current leaving the battery is 0.962 A a...

Electric Fields/Gauss's Law: Parallel insulating plates Here's the question: Two large, parallel, insulating plates are charged uniformly with the same charge density σ. What is the magnitude of the resultant electric field E ? The correct answer: zero between the plates, σ/E0 outside My...

A proton is shown to pass between two parallel conducting plates across which a steady potential difference is maintained. Its path curves upwards. An alpha particle enters at the same point with the same velocity as the proton. Add its path to the diagram. Why is it like this. The path is...

Homework Statement Two parallel metallic plates are placed horizontally with a separation of 2.2mm. When the voltage is reduced to zero (so that the plates are neutral), the particle (or sphere) is observed to fall with constant velocity. It is observed to travel 0.85 mm in 8.9s. A new p.d. V...

Homework Statement Hello, I wonder if anyone could check my answer to this problem. Thanks in advance An electron is liberated from the lower of two parallel plates separated by a distance of 5mm. The upper plate has a p.d. of 1000v relative to the lower plate. How long does it it take for...

Homework Statement Would it be possible for someone to check my answer to this past examination question, as I am not sure I'm doing them correctly! Thanks in advance. A negatively charged oil drop, mass 2.4 x 10^–12 kg, is stationary between two horizontal metal plates spaced 1 cm apart...

Homework Statement Electrons, which evaporated from the filament accelerated in homogeneous electric field that was created by using two parallel metal plates, connected to the voltage V = 1 kV. The resulting stream of electrons is deviated from the initial direction for a φ = 15 ° in...

Homework Statement Explain why in the absence of any other charged bodies, the potential will be zero along the centre line between plates Homework Equations - The Attempt at a Solution not sure how to explain it. is this because that the electric field in that region is zero?

Homework Statement - How much is the electrical voltage U between two evenly electrified parallel flat plates, distanced d = 1 cm, if the strength of electric field between them is E = 1 V / m? - What is the strength of electric field to the left and to the right of each plate? - What is...

Homework Statement - How much is the electrical voltage U between two evenly electrified parallel flat plates, distanced d = 1 cm, if the strength of electric field between them is E = 1 V / m? - - What is the strength of electric field to the left and to the right of each plate? - What is...

dear.if the x-component and y-component of velocity is given i.e Vx &Vy.and E (electric field) is also given. then what equation should i use to find acceleration of the electron. i only know about E=F/e(relation of electric field and force) F=ma.if i want to find the "acceleration" if Vx ,Vy...

I have two plates and I want to charge them so they repel each other. To do this I ran opposing currents through the plates and to create magnetic fields which will cause the plates to repel. Now, I need to find the force exerted on each plate. I am having a little trouble with this...

whts the relation of velocity V and electric field E? i only know about E=F/e(relation of electric field E and Force F) any one like to answer?

Why electric field between 2 charged plates is sigma(surface charge density)/(2epsilonO) permitivity of free space?

Homework Statement two metal plates 10mm thin are held a distance 40mm apart with a P.D. 10V across them. +ve plate on left. In between the plates is a vacuum (free space basically). Calculate the charges and electric fields within this system.Homework Equations Q=VC C = εo.A/d No surface area...

Homework Statement "When a block of insulating material such as Lucite is bombarded with high-energy electrons, the electrons penetrate into the material and remain trapped inside. In one particular instance a 0.1 mA beam bombarded an area of 25cm^{2} of Lucite (Class A: \epsilon_r=3.2) for 1...

Homework Statement Two infinite sheets with surface charge density σ1 and σ2, respectively, are oriented perpendicular to the x-axis. An infinite, conducting slab of thickness a is placed between the charged sheets as shown in the figure. The conducting plate has a net charge per unit area of...

Hi everyone, I've been running through past Physics papers, and thought that i'd get you guys to check the answers just to make sure that I've done it correctly. http://img119.imageshack.us/img119/1506/img008v.jpg Question 6: Answer I have is C, using right hand rule for both conductor...