Plates Definition and 591 Threads

A uniform electric field exists between two oppositely charged parallel plates connected to a 13.0V battery. The plates are separated by 7.00x10-4 m.a) Determine the magnitude of the electric field between the plates b) If a charge of -4.29x10-6 C moves from one plate to another, calculate the...

Homework Statement From my lecture notes, here are the equations for convection between two plates. I have derived equations 9.6, 9.7 and 9.8. But for 9.4 there's a problem when gravity becomes involved. Homework Equations Navier stokes: ## \rho \frac{D \vec u}{D t} = -\nabla p + \mu...

Hi :), I need to calculate the shear stress applied between 2 plates and I don't remember how to take the thickness of the plates into account, --So basically I will be grateful if somebody could write the equillibrium for shearing stress between 2 plates (1 plate is applying force on the other...

I have two parallel conductive plates. The plates are charged to a high voltage by a HVDC power supply. When the plates are charged rf energy is present between them. What could be causing this? I am thinking field emission at the cathode is causing it ,but not really understanding physics is...

Homework Statement A thin hair is placed between two microscope slides. When laser light is shined down onto the slides, periodic intensity maxima are seen to span the slides. Which of the following changes will decrease the distance between the maxima? I. Decrease the wavelength of the laser...

Hey guys, I'm having some trouble figuring this part out, so I've done most of this problem just can't figure out this part...so here is the question. (Sorry in advance as I don't know how to use LaTeX on here). What is the distance Δy between the two points that you observe? Assume that the...

Homework Statement 1. The distance between two parallel plates is increased while they remain hooked to a battery. Which one of the following statements is true? The voltage between the plates will decrease. The electric field between the plates will increase. The charge on the...

I need to get a Peltier tile/plate for one of my projects and I got really confused when deciding between them based on No. codes on it, as they're all similar in dimension. Like for example, I was looking for 4cmx4cm Peltier plate, and I found myself getting confused when there were choices...

If i have a parallel plates capacitor , where the plates have different charges , eg, one plate has 1 C of charge and the other is neutral , what's the potential difference? what if i grounded the neutral plate , will it gain 1 C of charge?

Hello everyone, I was wondering how one would calculate the three-dimensional charge density (per volume) in a capacitor plate with a given thickness. I know how to calculate the charge density on the surface based on the capacitance and voltage, but how would one calculate the comprehensive...

I'm designing a custom ultra stiff strut bar for a car. Achieving extreme stiffness usually adds a lot of weight, so I am looking into ways to reduce the weight. Honeycomb plates are extremely light, but are only stiff in certain directions. This is perfect for my application since I am...

As I understand it if you charge two plates as in a capacitor and then disconnect the voltage source and pull the plates apart to an arbitrary distance the voltage at the terminal increases. Is that correct? Will that voltage continue to increase? Is there a point that the voltage will stop...

Homework Statement In the following RC circuit, the capacitor is in the steady state. The initial separation of the capacitor plates is x0. If at t = 0, the separation between the plates starts changing so that a constant current flows through R. Find the velocity of the moving plates as a...

Homework Statement We have two half-spherical electrodes, arranged so that they produce a spherically symmetric electric field. What is the magnitude of the electrical force on an electron between the two electrods? Specifications: Distance between electrodes: d=0.04 m Radius for first...

Hello With regards to a common example in most fluid mechanics books where there exists fluid between two stationary parallel plates and the top plate is pulled until it has a constant velocity U with force F, the result is \tau=F/A = μU/L. Although this is probably obvious to most, I am...

In an inkjet printer, letters are built up by squirting drops of ink at the paper from a rapidly moving nozzle. The ink drops, which have a mass of 1.3 10-8 g each, leave the nozzle and travel toward the paper at 21 m/s, passing through a charging unit that gives each drop a positive charge q by...

Homework Statement Two very thick equally-magnetized square plates of side 0.23m and of mass 20 g, are hung by threads 20.0 cm long from a common point. The plates repel and deflect from each other through a very small angle. a) Calculate the B field between the two plates, if the...

Homework Statement Compare the COMSOL results to the analytical solution for laminar flow between flat plates. Assume no effect of gravity on the flow (g = 0). The comparison will involve obtaining the velocity at a point in the flow field and the ΔP/L term. For example, you can compare the...

I have a slight issue with this derivation. Firstly, displacing one plate by dx requires work dW=-Fdx where F is the internal force between the plates resolved in the direction of x. I.e F=-dW/dx. If I do work on the capacitor W, this plus the energy provided by the battery to keep the...

I'm a little confused between two approaches to this problem: First approach (the one that makes sense to me): Choose a Gaussian surface over each plate. We have 2EA=σA/Eo so E=σ/2Eo for the positively charged plate and likewise for the negative plate. Within the capacitor, the fields...

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. Electrons are shot...

Imagine two parallel conducting plates set at a distance of several meters. If one charges the two plates simultaneously then one would expect a small delay before they started repelling each other due to the time it takes changes in the static field to propagate from one plate to the other...

Does Casimir plates prevent photon existence only perpendicular to them? I mean, Casimir attraction arises from the fact that the plates prevent some wavelenghts of photons to exist in between them, so an imbalance arises and pushes the plates together, right? But what about photons in other...

Homework Statement If the electric field strength between two parallel plates 1cm apart is 3.1kN/C, how much energy will be used by the electric field to move an electron (placed half way between the plates) 3mm nearer to the positively charged plate? Homework Equations Work Done =...

Yesterday I saw a car with a North Carolina license plate that read BUBBLY:-* (actually the * was in line with the preceding dash, and not raised superscript-style.) I didn't know such a thing was possible. And yes, it was an official state license plate. I was able to get a good look...

Homework Statement Two infinite conducting planes are held at zero potential at z=-d and z=d. An infinite sheet with uniform charge per unit area σ is interposed between them at an arbitrary point. a) Find the charge density induced on each grounded plane and the potential at the position of...

There are two expressions of electric field between two parallel plates,say one carries Q and another carries -Q Then the electric field between them=σ/ε0 But there is another expression that E=V/d where d is their distance of separation What are the differences between them?And what are the...

[b]1. An electron is placed between two charged parallel plates. The electron is in equilibrium between the electric force and the gravitational force. a) Make a drawing of the experimental setup. Label the direction of the gravitational field, the placement of the plates, and indicate which...

Homework Statement An electron is accelerated horizontally from rest in a television picture tube by a potential difference of 6380 V. It then passes between two horizontal plates 2.55 cm long and 5.47 cm apart that have a potential difference of 118 V. At what angle θ will the electron be...

Homework Statement The figure below shows two parallel plates. Assume they are infinite in area (this way we can neglect edge effects). The plate on the left is at a potential of +60V and the plate on the right is at a potential of 0V. The plates are a distance 20cm apart and the dashed lines...

Homework Statement I am curious about the situation of heat transfer between parallel horizontal plates in an enclosed space (particularly with the lower plate being higher temperature and subjected to a steady heat flux) with the enclosure itself being composed of a fictional "perfect...

Hello! We're in 8th grade and our doing a project-not homework. Our goal is to put piezoelectric plates inside a pillow and harvest the energy from the pressure of the head on the plate during the night and use it to charge a phone. However, from this point we are a little confused. We've been...

Homework Statement An ionized plasma flows with a velocity v in the z direction, though a rectangular pipe with x, y, z dimensions of w, h, l respectively. The walls at x=\pm w/2 are insulating while the walls at y=\pm h/2 are conducting. Lastly there is a magnetic field B in the x...

A parallel plate capacitor of circular cross section r>>d, and separation d. It is charged to potential V then disconnected from the circuit . What will be the work done in moving the capacitor from d to d1? Answer: Here the initial energy is 1/2CV^{2} Where C=Aε/d While moving the capacitor...

Hi, I would like to know how would i be able to solve a problem involving two (2) pressure reducing orifice plates in series with seawater as medium. I know the orifice diameters, the supply pressure, but i don't know the overall flowrate, and pressure after the orifice plates. The...

Hi, I'm rather confused as to how this diagram in my book. I know that in order for a mode to propagate, a standing wave must be formed in the waveguide, and this happens above some cutoff frequency that one designs for. What I don't understand is, below cutoff, what happens? I don't...

Hello, I am facing a paradox, well it seems like one, resolving the interaction force between two equally charged plates each bearing a positive charge. Let us assume this as Q, and plates having area A. On one hand , we can claim the force = Q^2/2Ae0 where e0 is the vacuum permittivity...

Homework Statement Plates of a capacitor have charge 2CE and CE initially. Now the switch S is closed. Which of following statements is true? Assume that the battery, resistor and wires do not have any capacitance. A)There is no change in charge at outer surfaces of the capacitor. B)There...

Imagine that we have a pair of parallel plates, A and B, separated by some distance as in Fig. 1 below. At time t_1 we simultaneously charge both the plates. This could be done by previously sending a light signal to a charging apparatus at each plate from a source located at the...

Homework Statement A uniform electric field exists in the region between two oppositely charged plane parallel plates. A proton is released from rest at the surface of the positively charged plate and strikes the surface of the opposite plate, 1.59cm distant from the first, in a time...

Homework Statement Two oppositely-charged parallel plates are separated by a distance of 0.03m. a. What is the strength of the electric field between the two plates if it takes 2.4x10^-19 J of energy to move an electron from one plate to the other. b. What is the acceleration of that...

Hi...why the plates bcomes charged as soon as they are connecetd ?

Any ideas on how one can make a small gap (~10-50nm) between two parallel plates and maintain a known distance between them. I have two very flat surfaces and I would like to maintain a small gap (known gap) across them. I searched in the literature but I came up with nothing so if you have any...

Homework Statement It would be greatly appreciated if someone could check over my work. It is very likely that I made mistakes. If I made any mistakes, could you please tell me where I went wrong? Thank you. I will use this problem to study for my next exam. I have also attached a...

Homework Statement The space between the plates of a parallel plate capacitor is completely filled with a conducting slab.What is the capacitance of the system ? Homework Equations The Attempt at a Solution The capacitance of a capacitor when a dielectric medium is placed...

Shuttling ball. I was told that as the two conductive plates are brought closer together the speed the shuttling ball travels between them is increased. I don't understand this as i thought because the electric field is uniform between plates the distance they are apart wouldn't affect the...

Homework Statement A,B,C,D are four 'thin',similar metallic parallel plates,equally separated by distance d,and connected to a cell of potential difference(V) as shown in the attachement. Write the potentials of A,B,C,D. If B and C be connected by a wire,then what will be the potentials...

Say you have a charged, parallel plate capacitor, isolated from any external circuit. If you were then to gradually separate the two plates (or thicken the dielectric) what would happen to the charge on the two plates ?

1. A proton with kinetic energy of 2.1 x 10-17 J is moving into a region of charged parallel plates. The proton will be stopped momentarily in what region (attached diagram)? a) Region K b) Region L c) Region N d) Region M Homework Equations \DeltaEk + \DeltaEp = 0 The Attempt at a Solution...

Homework Statement When a charge Q is given to an isolated metal plate X of surface area A its surface charge density becomes σ .When an earthed metal plate Y is brought closed to X ,find magnitude of surface charged density on inner and outer surfaces of X and Y. Homework Equations...