Plates Definition and 591 Threads

Hi, Does anyone know an equation/approximation/model or other to estimate the capacitance between two coplanar (adjacent) plates? I know that for parallel plates: C = E0*Er*(A/d). I also know that the capacitance decrease as the plates move from a parallel to a coplanar geometry as the...

Two infinite conducting plates 1 and 2 are separated by a distance l. A point charge q is located between the plates at a distance x from plate 1. Find the charges induced on each plate. I solved this problem assuming (intuitively) that a potential difference between plate 1 and 2 equals 0 and...

Hello, I am interested if ANYONE can point a mistake in my reasoning... I am constantly getting a result that is 2X greater than the textbook derivation. The problem is this: We have 2 CONDUCTING, infinitely large, oppositely charged plates (far away), each with a charge distribution of...

obvious question IMO, but just need to make sure before test. if you have two parallel conducting plates, and apply charge to one of them, then the field between them is half, compared to if the plates were acting as an air capacitor ie. both plates oppositely charged? thing is, when I use...

Am I overthinking this problem? A 15uF capacitor is connected ot a 55V battery and becomes fully charged. The battery is removed and the circuit is left open. A slab of dielectric material is inserted to completely fill the space between the plates. It has a dielectric constant of 4.8...

there's something about these PDE:s that I don't understand, can't find out how it really works. Here comes a problem that we can discuss. 2 equal 0.2m think iron plates got the temperatures 100 and 0 degree C from the beginning. At the time t = 0 are these 2 plates laid next to each other...

Can anyone help me with a hint of some sort? I am lost... A small sphere with mass 1.50 g hangs by a thread between two parallel vertical plates 5.00 cm apart. The plates are insulating and have uniform surface charge densities + and -. The charge on the sphere is q = 8.90 10-6 C. What...

The problem says that there are two parallel plates having charges of equal magnitude but opposite signs and they are separated by 16cm. Each plate has a surface charge of 31 nc/m2(sorry don't know how to superscript). I need to find the potential difference between the plates. I thought I...

Hey guys. I'm having trouble analyzing a part of this problem. Two conducting, infinite sheets of charge (with thickness a) are fixed perpendicular to the x-axis as shown. The sheet from x = -2a cm to x = -a has a net charge per unit area -s and the sheet from x = +a to x = +2a has a net...

I have a positive and a negative charged plate running parallel to one another. To find the Electric Field to the left of the plates, I say: E dot dA = Qenclosed / permittivity Then E times 2pi(r) = Qenclosed / Permittivity then E = Qenclosed / 2pi(r) x Permittivity and since Qenclosed...

I need help on a few questions. 1.An alpha particle has a positive charge of 2e and a mass of 6.6 x 10^-27 kg. With what velocity would the particle reach the negative plate of a parallel plate apparatus with a potential difference of 2.0 x 10^3 V. a)if it started from rest at the positive...

Hello all.. Here's a question I need some help with... A point charge +Q has been placed between two infinitely large conducting plates. The charge induced on the surface of the first plate is q_{1}. What should be the charge induced on the surface of the second? (Diagram attached; the...

How does one prove that the force between two conductor plates is F=q^2/2eA, where e=epsilon. If I use F=qE. Where the electric field is generated by one of the conducting plates: E=q/eA, then F=q^2/eA. I think what the answer assumes is that the E-field is from a uniform plate...

How much are graphite plates? I need them to build my fuel cell.

I'm trying to calculate the capacitance across a couple of parallel plates but, for fun, one of the plates looks like a stair step. So it has 2 sections facing one normal parallel plate at different distances. I see two possibilities here, one being that I can simply treat the two sections as...

So I've got this velocity distribution for laminar flow between parallel plates. \frac{u}{u_{max}} = 1 - (\frac{2y}{h})^2 h is the distance between the plates with the origin placed midway between the plates. I'm assuming this is for water flowing at 15 deg C with u_{max} = 0.10 m/s and h...

Take two charged, moderately thick conducting plates. Suppose one has a charge +Q and the other -Q. Arrange the plates facing each other as in a capacitor. So why don't the outer surfaces of the plates have any charge? (The charge +Q, for instance, is wholly on the inner surface, the surface...

I am curious as to your thoughts about people who post stickers on the back of their cars or change the license plate frame to announce to the world where they went to college. In some cases you can learn much of a stangers background as they have two or three and one specifies mba or JD or...

Hi, I generally understand interference and Newton's ring/Young's double slit experiments, but I can't find the answer to a pretty simple question: When two glass plates are placed together and their is a gap of thickness "t", contructive and destructive interference leads to interference...

Two plates, potential difference V =1500 which are .012m apart. What speed particle can pass through them without being deflected?

Indicate the direction of the electric field between the plates of the parallel plate capacitor shown in the drawing if the magnetic field is decreasing in time. Give your reasoning. Please help me.. how can i do this?

Three very large square planes of charge are arranged as shown (on edge) in Fig. 21-70. From left to right, the planes have charge densities per unit area of -0.50 µC/m2, +0.20 µC/m2, and -0.30 µC/m2. Find the total electric field (direction and magnitude) at the points A, B, C, and D. Assume...

What is the best way to etch copper with house hold materials? It is for making print plates.

Which of the statements below are true for two oppositely charged, isolated parallel plates? (C is the capacitance, U is the stored energy, +Q and -Q are the charges on the plates.) Note: isolated plates can not lose their charge. (Enter ALL correct statements, e.g., BCD) A) When the...

1. parallel plate with capacitor of 20uF, plate is 0.5mm apart. Find 1. Area of each plate 2. potential difference if there's a change of magnitude of 30uC on each plate. 3. stored energy 4. electric field between the two plates 5. charge density on the plate. |_| |_|...

How is potential difference found between two plates in a B-field? Any help is greatly appreciated.

Small question: The capacitance of parrallel plates decreases as you increase the distance between them, why? I know the voltage increases, because the electric field is constant, but how does this stop more charge from entering the plate? I mean our voltage relative to some far-off charge is...

Alright, here's the problem. You're told that there are two square metal plates with side length L and a distance d away from each other. One has charge +Q, the other -Q. Then they ask for the magnitude for the charge between the plates, not close to the edge. Here's what I have so far: The...

We were told that the electric field between two oppositely charged parallel plates was uniform in any region between them: like +++++++ ------------- but the teacher didn't really explain why: it makes sense that they'd always be in the same direction, but how would you prove that...

5. Two parallel plates labeled W and X are separated by 5.2 cm. The electric potential between the plates is 150V. An electron starts from rest at time tW and reaches plate X at time tX. The electron continues through the opening and reaches point P at time tp (remember e = - 1.6 X 10^-19 C and...

If two capacitor plates at a moderate voltage (200-300V) and low capacitance are kept very close to each other would there exist a tunneling current between them. If the tunneling current will exist, then it will gradually reduce the energy of the capacitor. Where will the used capacitor...

I was wondering if someone could help me out here. It seems that no matter how many textbooks i consult, each one has a slightly different version of the plate tectonics map. There seems to be some amount of confusion about the boundary between the Eurasian and American plates, the plates at the...

Help! Parallel Plates Velocity of Electron New to the forums and am hoping to find some major help... I need some help understanding parallel plates and how to calculate the velocity of an electron going through them. What formula's would I use? Any help would be appreciated...please help...

Another question for Gauss' Law; A very large, thin, flat plate of Aluminium of area A has a total charge Q uniformly distributed over its surfaces. If the same charge is spread uniformly over the upper surface of an otherwise identical glass plate, compare the lectric fields just above the...

A parallel plate capacitor has charge Q and plates of area A. What force acts on one plate to attract it toward the other plate? It's F = Q^2 / (2*8.854e-12*A) ... something to do with the electric field divided in 2? Wondering why there's a 2 in the denominator... thanks :)

Hi I am trying to solve this problem. I would like to be able to solve for the capacitance between two parralel plates of different areas. First I tried thinking of them as concentric cylindrical shells but twisting them to do this is not the same thing I realized because the distance...

Excerpt from: Beicher and Serway, "Physics for Scientists and Engineers with Modern Physics, 5th edition" Chapter 24, problem 58, part c: Two infinite, non conducting sheets of charge are parallel to each other, as show in the figure. The sheet on the left has a uniform...

Howdie all, I'm soo glad I found this forum, people are genuinely working together instead of ignoring their fellow physics brethren =) A pair of square parallel conducting plates, having sides of length .05 meter, are .01 meter apart and are connected to a 200 volt power supply. An electron...

Here's my problem: A parallel-plate air capacitor has a capacitance of 730 picoFarads. The charge on each plate is 2.95 microCoulombs. a) What is the potential difference between the plates? I used the equation V=Q/C to get 2.4746E-4 V, but this is incorrect. b)If the charge is kept...

Can someone give me three real life applications of the Millikan Experiment or parallel plates? Also if possible can you give me a little description of how it works. Also, we are not allowed to use a tv,computer monitor or a printer.

Two parallel thin metallic plates with a gap between them are used as a heat insulator. How does the heat flow rate through this device depend on the temperatures on its two sides in the following two cases? Case 1: The gap is filled with air. Case 2: There is a vacuum in the gap.