Plates Definition and 591 Threads

Homework Statement An alpha particle is placed between two horizontal parallel charged plates that are 2.00 cm apart. The potential difference between the plates is 12.0 V. WHAT is the ELECTRIC FORCE acting on the alpha particle? -Mass of alpha particle: 6.65 x 10^-27 kg Homework...

I'm having some difficulty applying Gauss's Law to metal plates. From what I've studied it seems to me that Gauss's Law only really works when there is spherical symmetry, in all other cases it is an approximation. Am I correct in inferring this? However, in a case where the distance between...

There are two plates that lie horizontally parallel to each other, separated by a distance of 1 cm. Each plate is 2 cm long. The question wants you to assume that the electric field between the two fields is constant, and pointing directly downwards. On the left-most edge of this plate...

Homework Statement Consider a parallel-plate capacitor with plates of area A and with separation d. Find F(V), the magnitude of the force each plate experiences due to the other plate as a function of V, the potential drop across the capacitor. Hint i used If the plate separation were changed...

So... 3d cinema relies on circular polarized light these days. Creating circular polarized light requires the use of a quarter-wave plate, which exploits birefringence to; (a) effectively create two rays of light linearly polarized at right angles (b) retards one of them by a quarter...

I need to insulate the area between two heat sinks. The gap is about 10mm, and the bottoms of the heat sinks are facing each other with a peltier chip sandwiched in-between. However the two sinks are in separate enclosed sections, and I need to insulate the hot side from the cold side as much as...

I found this problem while self-studying Electricity and Magnetism, and I want to know if my solution is rigorous. Homework Statement Show that the plates of a plane capacitor attract each other mutually with a force equal to F=\frac{q^2}{2\epsilon_0 A} Obtain this result by calculating the...

If we put two identical quarter-wave plates together what will be the resulting plate? How would it be different from one of the quarter-wave plates?

Apologies if this has been answered before. I did search but couldn't find it... Imagine two fixed conducting parallel plates separated by 10cm of air. If an alternating voltage is applied to these at 10MHz an electric field produced between the two plates like a giant capacitor. Given that...

Hi, does anybody know how to find the diameter of the vena contracta in gas/vapour flows in orifice plates?

Hello. First time on the forum. I have a plate being supported off a series of beams (see pdf). The beams are close together and restrained. The plate is simply supported on all sides and the beams simply supported. The plate is to be used to distribute a point-load over the beams and is...

Homework Statement Two infinite plates are kept at different temperatures T_{cold}<T_{hot}, with vacuum between them. A very thin plate, isolated from the environment, is inserted between the two plates. How will the net rate of heat emission from the hot plate to the cold plate change...

Hello, Is the force experienced by a charge at any point between two charged parallel plates the same? Just a preliminary step to my homework question, Let's say I have two parallel charged plates. (positive on top and negative on bottom with field lines going downwards.). Would all positive...

Homework Statement The problem is: If you have 2 rectangular plates 1cmx10cm each, which means that the area is A=10cm2=10-3m2for each plate; every plate holds a Constant positive charge of Q=+2x10-6C each; these plates are separated by a distance d=1cm=10-2m What is the electrostatic...

I am a mechanical engineer and not an electrical engineer, so feel free to snicker at my question. Can a capacitor have more than two plates? If so, what happens? Is it less efficient? How would a tripple- or quaduple-plate capacitor behave differently than a dual-plate capacitor, assuming...

Hi. I've been studying in details how a microphone works. I've found a type of microphones where capacitor is used to record sound. The idea is simple. Increasing and decreasing the distance between the plates of a capacitor (sound waves) results in the changing capacitance. Being connected...

The negative pressure generated in the Cashmeir effect suggest that negative energy can exist in small spaces between non-conducting plates. How much negative energy exist in a given amount of space as measured in units that refer to energy (as opposed to units of force created by the Cashmeir...

Derive the electrostatic potential between two flat plates in electrolyte solution. The surface potential at the plate surfaces is low. I think this problem uses the Poisson equation for electostatic potential, but the one I came up with was wrong. It involves the hyperbolic cos. (cosh)

Homework Statement A proton is released from rest in a uniform electric field of mag. 90000 V/m directed along the positive x axis. the proton undergoes a displacement of .2m in the direction of the electric field. Find the change in electric potential. Homework Equations no idea...

Hi all, I am in the process of developing a science project. That is when I came across different types of levitation including electrostatic levitation. Maglev trains are a good example of magnetic levitation. We know that like charges repel each other. Its on the last sentence that I...

Homework Statement Two horizontal metal plates are 1cm apart in air. An oil drop bearing a charge of one electronic unit is balanced between the plates when the potential difference between them is 800volts. Find the mass of the drop. Homework Equations I may need to use some...

Homework Statement To find the capacitance of parallel plates, I am first finding the E field using gauss. However I don't know what the gaussian surface will be. I don't think it will be a gaussian pillbox as the plates aren't infinite, but will it be a sphere?? On a side note, if I...

Hey you all, I have a practice exam problem which is causing some difficulty for me. Basically I have a fully developed flow through two parallel plates. One plate has a constant heat flux and the other plate is heavily insulated. I have found the velocity profile: U=2*Uinf*(1-r^2/h^2)...

what would happen if I take apart the plates of a charged capacitor? Would the plates stay charged, or will the plates loose their charge? will the energy stored in the capacitor during charging stay stored in the plates though there is no more existence of electric field?

Homework Statement Electrons are accelerated between points A and B to the energy of 7.1keV, see attachment. The coordinate system was selected to have the origin at the startup point A. The electrons enter an area between two parallel plates where the magnetic field is established by...

Is there any possible way that an electric field between two positivly charged plates (charge is the same on both of them) could induce a charge in a conductor that is put in this field?

Homework Statement Capacitor C1 is charged so that potential difference between its plates is 20V. Another capacitor C2=33 microF has potential difference of 4 V. After plates of the capacitor that carry the charge of the opposite sign were connected the potential difference became 2V, find...

Hi, I have an easy problem for you I think but I'm not a specialist in thermo problems. Here is my problem. Homework Statement 2 plates in aluminum, one at T1=230°C and the other one at T2=30°C. In between, some air or something else (I don’t know yet). Homework Equations Equation...

Homework Statement 3 metallic plates are placed at a separation d1 and d2 as shown in figure. A charge Q is given to the middle plate which is free to move, then A)it will slide towards left if d2>d1 B)it will slide towards right if d2>d1 The Attempt at a Solution I found out the charge...

Is there any electric field outside the region between the plates of a parallel plate capacitor? What about near the edges? Do we neglect that variation in deriving an expression for the field inside? The positive and negative charges appear only on one side of each plate so I don't think there...

Homework Statement Comment on the electric field lines of a pair of finite parallel plates (a) between the plates and (b) near the edges of the plates. Homework Equations The Attempt at a Solution

Hello I am trying to understand some fluid mechanics I have two parallel infinite plates with fluid between the plates and some fluid above the plates. The fluid above the plates has a free surface exposed to the atmosphere. And we can neglect body forces. The fluid flow (steady and...

Hi all, Suppose an alpha particle of 3.2 x 10-19 C accelerates from rest between two oppositely charged plates starting from the positive plate. The electric field between the plates is uniform equal to 39000N/C. The distance between the plates is 4.50 x 10-3m Does the alpha particle...

Why do the field lines bulge out at the ends of plates with finite lengths? I understand why the field is uniform between infinitely long plates but cannot extend the concept to plates with fixed length:( I know they have to bulge but why not bulge inwards rather than outwards?

capacitor question...(why does AC need a return path) say you have an ac power source (120 v) connected to a circuit which just has one parallel plate open air capacitor, with the plates separated by, say, 1 mm. you measure the current flowing through the circuit and you get some rms value...

Say there are two charged plates opposite each other, 1m apart; one is +20V and the other is -20V. There is a point where we say there is zero potential, 50cm from either plate. I don't understand how we can say that a charge would have zero potential when we define potential energy as an...

Homework Statement Consider a parallel plate capacitor connected to a battery. You move the plates closer to each other. Will you do positive or negative work? The Attempt at a Solution As the plates are moved closer to each other, capacitance increases which increases the stored energy (V...

Hey, I've recently been studying electric fields, and our teacher told us that the field is approximately uniform between two charged parallel plates, ie the force acting on a unit charge is equal everywhere. This doesn't seem to tie with everything else we've been taught; surely, as you...

Homework Statement how i can calculate force between condensator plates?

Homework Statement [PLAIN]http://img214.imageshack.us/img214/6328/physics2.jpg An electron enters the lower left side of a parallel plate capacitor and exists precisely at the upper right side (just clearing the the upper plate). The initial velocity of the electron is 7x10^6 m/s parallel to...

Homework Statement hello, how can i calculate force which work between two plates in condensator? I tried to write this in this way...

Hi, I was wondering if someone could help me understand how the potential of a parallel plate capacitor can be altered. I understand that the potential difference across two plates is equal to the potential of the battery that charges them, but can this potential be altered by changing the plate...

Homework Statement Identical plates are placed close together on ice. A 0.742 kg rabbit that is initially sitting on the plate on the left jumps to the other plate and immediately back to the original plate. The rabbit leaves both plates with a horizontal component of velocity of magnitude...

Homework Statement 5. Two large, parallel conducting plates carrying opposite charges of equal magnitude are separated by 2.20 cm. a) If the surface charge density for each plate has a magnitude of 47.0 nCm^-2, what is the magnitude of the electric field intensity in the region between the...

Hello, I can`t understand the following: Let`s say that we have a simple capacitor with two plates and air between them. And this capacitor is in a series circuit with a switch, voltage source and a resistor. Also, the capacitor is discharged and the switch is open. The voltage source is...

Homework Statement An electron with an initial velocity of 5.6x107 m/s in the x-direction moves along a trajectory that takes it directly between the center of two 20 cm x 20 cm plates separated by 1 cm. The plates are connected to a high voltage power supply so that the potential difference...

how would you find the gap size between 2 infinite plates given that the fluid is water and the plates are silicon? the temp of water is 20 C and I am assuming that the heat transfer coefficient is 390 W/m^2K. i remember doing this stuff in heat transfer with temperature profiles and stuff but...

Homework Statement An electron starts from one plate of a charged closely spaced (vertical) parallel plate arrangement with a velocity of 1.63x104 m/s to the right. Its speed on reaching the other plate, 2.10 cm away, is 4.15x104 m/s. ... If the plates are square with an edge length of 25.4...

Homework Statement I am trying to calculate the electric field between these two plates... and I am using two different methods to do so. One gives me the correct solution, and the other does not. I am curious as to why the second method is wrong. Homework Equations Gauss's Law Phi =...

Upon calculating the electric field for a plate of charge, you arrive at: E = Q/Ae (Q the charge on the plate, A the area of the plate, e the permittivity of the dielectic) But then, isn't the total electric field between the plates twice this because of the equal but opposite charge on the...