Plate Definition and 960 Threads

Hi, A time-varying (sinusoidal) voltage source is applied to a parallel plate capacitor of length d. Then the E field will vary according to E(t) = V(t)/d. However, this suggests that, for any given time, the E field is constant with respect to spatial coordinates. Therefore, the curl of E is...

is there any way to fully neutralize a charged metal plate ? connecting it to metal body of relatively huge capacitance will make its charge negligible but not zero? is there any other way?

Hi. Assume we connect both plates of a capacitor to ground and disconnect again, leaving them at ground potential. Then we bring electrons from one plate to the other, until there is a voltage difference ##\Delta U## between the plates. Compared to ground, one plate has the potential...

The other day we were working on a problem which stated : Q charge is given to the positive plate of an isolated parallel plate capacitor of 10 μF. Calculate the potential difference betweeen the plates. Our teacher said that as the plate is isolated, Q charge will be divided between the two...

I read of fossile records as old as 3.8 billion years. How can this be? Since I thought that it takes about 500 mio. years for plate tectonics to force all the Earth crust into the subduction zones into the mantle. No evidence should be left. I'm confused...

Homework Statement [/B] A square plate of side-length L, charged with uniform surface charge density η. It is centred at x = y = z = 0 and orientated in the z = 0 plane. The task is to determine the z-component of the electric field at the point r(x, y, z) = r(x, 0, d), offset along the...

Hi all, In the attached photo, you can find a plate supported along the edge by "frictionless" support and I am trying to obtain the stiffness matrix using the node at the center. I wonder why the Kxx and Kyy (highlighted) are not equivalent or even near to each other, any suggestions?

Homework Statement An electron is launched at a 45∘ angle and a speed of Vo = 5.0×10^6 m/s from the positive plate of the parallel-plate capacitor towards the negative plate. The electron lands 4.0 cm away. Homework Equations F = ma = qE v = d/t s = vt -(1/2)at^2 x = 0.04 m The Attempt...

Homework Statement Physical understanding about the variation of hoop stresses in a plate with a hole Homework EquationsI have been reading about the solution of stresses in solution of plate with a hole from here: http://www.fracturemechanics.org/hole.html . I’m unable to physically...

Homework Statement An electron is emitted by an electron gun which is midway between two parallel charged plates which are 20 cm apart. The electrical field strength between the plates is20 N C^-1. The electron is attracted towards the positive plate and strikes the plate as shown. If the...

Hi, This is probably an easy answer but I can't get my head round it! If I have a test rig that measures pressure differential in a test chamber at a set flow rate, how do I calculate what the pressure differential should be if I put an orfice plate in with a certain size diameter hole in the...

Hello, I have a silicon wafer with a 50nm layer of copper sputtered on it. I coated it with a 1µm of positive photo resist and patterned it with a UV laser stepper. Then I developed it and washed it thoroughly. The pattern has a surface area which measures appx 1300µm x 8µm. What I want to do...

Hi there, I'm trying to simulate a vibrating plate with free edges. If i consider a consider a plate with fixed edges, the eigenvectors of the matrix bellow (which repesents the Laplacien operator) with S as a nxn tridiagonal matrix with -4 on the diagonal and 1s on either side (making the...

During high school; I thought atmospheric pressure is so strong that plate will remain intact to the glass full of water when made upside down. But when we decrease the density of the fluid to the air; this phenomenon wont' work. That means atmospheric pressure is not only playing role in this...

If the distance between the plates of a parallel condensor is 4mm and the potential difference is 60 volts . Now if we increase the distance between the plates to 12mm , then Why the electric field does not get decrease , instead of that potential difference between the condensor becomes 180...

Homework Statement Problem is as shown in the picture. The answer is meant to be a 4.59mm. Homework Equations Tau=mu(du/dy)The Attempt at a Solution Force (tau) acting on plate from both fluids is equal, as is velocity (du). mu1 (du/dy1) = mu2 (du/dy2) mu1/dy1 = mu2/dy2 (mu2/mu1) *y1 = y2...

Homework Statement A cell membrane consists of an inner and outer wall separated by a distance of approximately 10 nm. Assume that the walls act like a parallel plate capacitor, each with a charge density of 10^−5C/m^2, and the outer wall is positively charged. Although unrealistic, assume that...

Homework Statement Shown in picture Homework Equations So far just used w=v/r The Attempt at a Solution [/B] Could only do part a. W=v/r =0.3/0.2 =1.5rad/s For part b I would assume the velocity is zero? But I don't think that's correct. Any help with part b and c would be great, and is...

I am currently working on my college project about the design and optimization of plate heat exchanger. However, i have no idea where to start the project. Here is my first thought: - I set the hot and cold fluid to be water, 90 degC for the hot inlet and 30 degC for the cold inlet. - 50mm inlet...

I have a diameter of orifice is 1.025 inches and it says the Plate Area is 0.0058ft ^2 how is this answer received? Ill be using it to find orifice coefficient I don't understand why its 0.0058

I know C=Epsilon0(A)/delta x From the problem, C=3,000 Epsilon0 = 8.85 × 10^-12 and delta x is .5mm The answer is supposed to be given in meters and should be close to 40,000 but I got 1.6*10^11m...help please!

Homework Statement In the "Before" scenario, there is conductive plate in electrostatic equilibrium with uniform surface charge density +η (the plate has some thickness but the width and length are significantly larger). In the "After" scenario, an infinite plane of negative charge with fixed...

Homework Statement A jet of water , 50mm diameter , with a velocity of 18m/s , strikes a flat plate inclined at 25 degree to the axis of jet as shown in figure, Determine the normal force , P exerted on the plate when plate is stationary . Homework EquationsThe Attempt at a Solution in the...

Homework Statement the figure showed a jet of water , with velocity 50m/s strikes the flat plate , which is inclined 30 degree to the jet . Find the force normal to the surface of jet. Homework EquationsThe Attempt at a Solution my question is the flat plate is 30 degree to the horizontal...

Dear Engineers, I have a rectangular plate (3 x 2 m) made of aluminium (12 mm thickness). I also have a evenly distributed load of 2500 kg spread over the entire plate. How can I calculate the maxiumum deflection at a certain point on the plate? The plate is fixed in all directions on the...

Homework Statement A parallel plate capacitor of area 60cm^2 and separation 3mm is charged initially at 90 micro coulomb. If the medium between the plates get slightly conducting and the plate loses charge initially at the rate of 2.5 *10^-8 C per sec then what is the magnetic field between the...

You have a capacitor and each plate is of area A, explain qualitatively what happens to the capacitance when you increase the size of only one of the plates and why. Edit: adding some conditions: 1. they are circular discs (for simplicity's sake) 2. one has diameter d1, one has d2, 3. make...

Homework Statement A parallel-plate capacitor has a plate area of .3m^2 and a plate separation of .1mm. If the charge on ech plate has a magnitude of 5*10^-6C then the force exerted by one plate on the other has what magnitude Homework Equations Q=E Ԑ A F=qE The Attempt at a Solution so to...

Hi, I'm working on a parallel plate wave guide for wave propagation and had a question about it. Here's a quick diagram: While analyzing an EM field polarized in the y-direction, the modal impedance of the TEn mode comes out to be: Why is that negative sign there? If someone could just...

Homework Statement The charge on the 3.00 cm2 area plates of an air-filled parallel plate capacitor is such that the electric field is at the breakdown value. By what factor will the maximum charge on the plates increase when bakelite is inserted between the plates? (The dielectric strength of...

Hi In one of my application I am using a linear actuator to lift a 30kg lid which has a diameter of 380mm. I can only use 1/3rd portion on the lid to take support, for actuator which I used a 60*20*180 long plate mounted to the lid and lift. How to calculate the deflection of lid when lifted to...

Hi, I'm seeking the formula to calculate how water moves from one tank into another through a perforated plate driven by waterlevel compensation. I found the calculation for the discharge of water through submerged orifices, but I think the calculation does not include that holes, one above the...

Homework Statement Uncharged metal plate area S and thickness d located at a distance r from the point charge q and oriented perpendicular to the vector r, as shown below. Find the electric force between the plate and the charge. The plate thickness is less, and the distance r is much greater...

This question is about the English Warbow in use during the War of Scottish Independence, Hundred Years War and War of the Roses. In 1545, way past the heyday of the Warbow, Mary Rose sank in the English channel. In 1981 they salvaged her. What they found was extraordinary. She carried 250...

What happens when negative plate of a charged capacitor is connected to positive plate of another charged capacitor and vice versa. ?

Hello all, I have a question about the plate with two edges fixed by weld and subjected to lateral conconerated load, as the following picture shown, I am not very familiar with plate theroy, Could you give me a soluation about this weld? Given, L1 Weld 1 Length L2 Weld 2 Length t Weld...

Hello, I am trying to make contact between a stationary line body and a moving plate that will compress the line body. But I could not make contact between them. There is also a automatic connection generated but while simulation it does not show the contact instead the moving plate...

I'm going to weld nickel plates/tabs to 18650 cells. Each two batteries will be welded together with a nickel plate. In the center of the nickel plate will be a copper wire to take the 20 amp current flowing from the two cells at 10 amps per cell. Since I have .2 mm thick nickel plates, to get...

http://i66.tinypic.com/2yts08m.jpg I was doing an experiment in which i have a needle perpendicular to a metal plate. I run 210kV between them. I want to find out the electric field between the two, and I also want to know the electric al field density throught the metal plate? Pls help. I...

When I was taught Gauss's law. My teacher used a cylindrical Gaussian surface to find the electric field above an infinite uniformly charged plate. What I have trouble understanding is why the plate has to be infinite in order for the arguments to work...

I'm trying to build a tank to hold diesel fuel, it will be on skids to lift with a fork lift but I also want to extend the the sides to provide a way to raise the tank from two attachment points on each side. The sides will be 1/4 A36 steel plate and the rest of the tank will be 10 gauge...

Homework Statement A line source of strength 2##\pi##m is located ##a## distance a above a horizontal plate. Find the force per unit width on the plate, ignoring gravity and taking the pressure below the plate to be uniform and equal to the stagnation pressure of the fluid. (You may nd the...

Homework Statement So, I always make mistakes on problems such as this (the grounding part), so I'm hoping someone could really explain to me how the process works instead of just answering this particular problem. There are n large parallel plate conductors carrying charges Q1, Q2,... Qn...

If I had 2 serrated plates like the ones in the attached picture locked in place like seen below. How would I go about calculating the maximum amount of torque needed for failure of the part. Assuming it has 48 teeth and is made from stainless steel?

I have 10mm thick film with dielectric constant of 3. Let’s say surface area of the film is 50 ft2. On the surface of the film I will deposit thin conductive layers with different resistivity. On the first sample of the film I will deposit thin layer with the sheet resistance of 10...

The Nusselt number for an entire flat plate in the turbulent region has two different equations: One for Turbulent and one for Combined Laminar and Turbulent. How do I know when to use one or the other?

Hey there, What would happen if I had a half-wave plate, and I rotated it at like 1 Hz? If I stick a linear polarizer on the other end, what would my outcoming beam look like if the incoming one was natural light?

I'm trying to figure out the effective strain of a frictionless punch on a deep plate. For simplicity's sake let's say it's in plane strain. Don't quite know where to start. Closest thing I can think of is the strain from a bulge test, but that involves a thin sheet. Looked at some indentor...

Hi I am woking on a project with dimensioning a plate heat exchanger and are looking at the effectiveness NTU method. The textbooks provide NTU equations for many kinds of heat exchangers but not for plate heat exchangers. Does anyone knows where I can find an NTU equation for a counter flow...

Homework Statement This is my problem in all its glory. Homework Equations f = uN The Attempt at a Solution For part a I simply did that tan(alpha) = f/N and therefore alpha = arctan(f/N). This simplifies to alpha = arctan(u). I believe this part is correct. The second part of this question...