Plates Definition and 591 Threads

Homework Statement Two infinite grounded parallel conducting planes are separated by a distance d. A point charge q is placed between the planes. Determine the induced surface charge densities as well as the total charges on the two planes. Homework Equations Potential of a point charge...

Thank you in advance for the help! Homework Statement Find the center of mass of a thin plate of constant density (delta) covering the given region. The region bounded by the parabola y= x - x2 and the line y= -x Homework Equations See attachment question 15 p1 The Attempt...

Hey all I read somewhere online that Coulomb's Law only applies to spheres and point charges, and was wondering what formula is used to calculate the force between 2 plates whilst charged the same polarity Also, what is the formula to determine how much voltage is required to maintain a...

Homework Statement Consider two infinite conducting plates of some thickness with charge 2q and -q. The system is in equilibrium, which means there's no charged particles in motion. Find the charge distribution on the surfaces of each plate. (designated as q1 q2 q3 and q4) Homework...

Homework Statement An air filled capacitor consists of two parallel plates, each with an area of 8.39cm^2, separated by a distance of .81mm. A 12.3V potential difference is applied to the plates. Find the capacitance. Answer in units of pF (pico Farad) Homework Equations 1. E = kV/d 2...

Suppose they're separated by a distance d and have thickness D. One has charge Q, the other has charge -Q. Why can we assume that each of the four surface charge densities are constant?

I have a question: I have two plates that form a right angle. How would I go about finding the Capacitance of the two plates?

Homework Statement A liquid-level transducer consists of two parallel plates of conductor immersed in an insulating liquid. When the tank is empty the capacitance of the plates is 200pF. The relative dielectric constant of the liquid is 25. Determine an expression for the capacitance C as a...

Homework Statement An uncharged conducting slab is placed between two infinitesimally thin insulating plates with surface charge densities \sigma_1 and \sigma_2, respectively. Describe what fields are induced in the conducting slab and their magnitudes. Homework Equations None? The...

Homework Statement Two 10 cm x 10cm square plates that are charged with ±12 nC and are 6 mm apart. What is the magnitude of the electric field between the two plates? Homework Equations E={sigma}{epsilon_0} . The Attempt at a Solution I know I have to use this equation but I'm...

Homework Statement An electron is projected with an initial speed v_0 = 2.00×106 {\rm m/s} into the uniform field between the parallel plates in the figure (Intro 1 figure) . Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the...

Homework Statement Homework Equations Ki + Ui = Kf + Uf The Attempt at a Solution I need to find the velocity of the proton when it's 2.3mm's to the right of where it is now. I need to find the acceleration of the proton. I believe that I should use F=ma to do this. The only...

A small sphere with mass 2.10 g hangs by a thread between two large parallel vertical plates 5.00 cm apart . The plates are insulating and have uniform surface charge densities + sigma and - sigma . The charge on the sphere is q = 7.70×10−6 C What potential difference between the plates will...

Dear all, I've found in many books forces acting between 2 parallel wires, but not between a magnetic field and a surface. Let's now imagine a conducting plate which is within a magnetic field. Which is the resultant force acting on that panel? Many thanks in advance! Raúl

Hello, I was wondering at high frequencies, does current literally go through the capacitor plates; from one side to the other? Or is it simply due to charges being stored on the plates, that once the polarity of the circuit has changed, the charges on the plate that has been stored from...

Homework Statement An electron travels with speed 4.91×107 m/s between the two parallel charged plates. The plates are separated by s=1.47 cm and are charged by a 203 V battery. What magnetic field strength will allow the electron to pass between the plates without being deflected...

I am studying for a test tomorrow and our prof gave us a practice test and I am confused on how to solve this problem A charged particle is accelerated through a potential of 15,000 volts, after which it passes between two deflecting plates. What voltage must be applied to these plates to...

Homework Statement ABCD are 2 parallel plates,between which a potential difference of 10,000V is maintained.An electron starting from rest,from point P,moves towards a small hole at Q. After emerging from Q,the electron passes through a region independent of any electric fields and then...

Alright before I ask the question I'm going to be pretty blunt, I'm not very good at physics at all. I have a great interest and desire to learn physics but it just isn't very easy for me so explanations are going to have to be pretty detailed and even then I still might not get them...

Homework Statement A capacitor is constructed of interlocking plates as shown in the figure (a cross-sectional view). The separation between adjacent plates is 1.26 mm, and the effective area of one of the adjacent plates is 6.1 cm2...

Homework Statement A ping-pong ball, of mas3E-4kg is hanging from a light thread 1.0m long, between two vertical parallel plates 10cm (0.1m) apart. When the potential difference across the plates is 420 V, the ball comes to equilibrium 1cm (0.01m) to one side of it's original position. What...

Homework Statement The question is at http://dl.getdropbox.com/u/175564/capacitance.JPG Homework Equations Q = CV C = \epsilon_{0} A / d The Attempt at a Solution The right solution is Q^2 / C that is (h). I know that C is proportional to the inverse of the distance between...

Homework Statement A capacitor has a capacitance of 2.5x10-8F. In charging process, electrons are removed from one plate and placed on the other plate. When the potential difference between the plates is 450v, hoow many electrons have been transferred? Homework Equations C=qV The...

hey sorry for the prolific posting but exam's are coming up and I'm just working through past papers. two conducting parallel plates have uniform uniform current densities flowing through them parallel to their surface. Use Ampere's Law to find the magnetic field inside and outside the...

In lecture, my professor showed us something peculiar. 2 parallel plates with equal charges lie close on top of each other. although the electric field in between the plates cancel each other out, the Force on one plate from the other is F = \frac {\sigma^2}_{2 \epsilon} due to...

Homework Statement I've been staring at this last problem for a while now...but i really don't get it. So if someone could explain to me how to do this, that'd be great. Thanks: In Fig. 22-64, a uniform upward electric field E of magnitude 2.00 x 10^3 N/C has been set up between two...

Homework Statement Two optically flat plates of glass are separated at one end by a wire of diameter 0.250 mm; at the other end they touch. Thus, the air gap between the plates has a thickness ranging from 0 to 0.250 mm. The plates are 15.0 cm long and are illuminated from above with light...

Just a bit confused/ need confirmation of what's happening. We shine light at the double slit and see interference patterns. Place two opposite 1/4 waves plate, so that we have which way information, in front of the slits. This causes the pattern to disappear. 1. Under what condition does...

Homework Statement HELP! A charged particle is stationary between two horizontal charged plates. The plates are 2.0 cm apart. The particle has a mass of 4.0X10^-13 kg and a charge of 2.4 X 10^-18 C. Find the potential difference between the plates. Homework Equations V= EPE/q ...

Homework Statement A small electrically charged object is suspended by a thread between the vertical plates of a parallel-plate capacitor. The acceleration of gravity is 9.8 m/s^2. What is the potential difference between the plates? Answer in units of kV. Given: tetha = 14 degrees...

Hi, I'm doing 2D modeling with COMSOL and my design is about a flow (in the x direction) inside a structure passing square objects, so I thought I could model it on the mechanics of flow between parallel plates. Unfortunately, the square objects are of the same height as the structure and...

Homework Statement Hey guys. So, I got this problem. According to their hint I'm suppose to calculate the work of moving one of the plates and from their, get to the force. I don't have a clue how to do that. I can't find a single formula that can help with that. Can I please have some...

Homework Statement Two very large, nonconducting plastic sheets, each 10.0 cm thick, carry uniform charge densities \sigma_{1}, \sigma_{2}, \sigma_{3}, and \sigma_{4} on their surfaces, as shown in the figure . These surface charge densities have the values sigma_{1}= -6.00microC/m^{2}...

Suppose there was a voltage difference between two charged plates, is the electric field constant at all points between these plates?

Homework Statement I have two large parallel plates that are conducting and separated by 10.0cm. The charges on the plates are uniform and equal in magnitude but opposite in sign. The difference in potential between the two is 500 V. The first question concerning this is which plate...

Homework Statement http://img11.imageshack.us/img11/667/efieldmm3.th.jpg Can someone please explain to me why the electric field inside is double of what's the outside based on the picture above? I don't understand what the green and red line is... Homework Equations The...

Calculating the Capacitance of "out of alignment" finite parallel plate capacitors Homework Statement Homework Equations The Attempt at a Solution

Homework Statement Two parallel plates with area A and charges Q and -Q are being pulled apart by force F, so that the distance between, x, slowly increases. Express F in terms of Q, A and x.Homework Equations -\Delta PE=W W=\int Fdx \Delta PE=q_{0}\Delta V Q=C\Delta V...

Homework Statement Hey guys, this is from Purcell 3.19 "Ions are accelerated through a potential difference V_0 and then enter the space between the semicylindrical electrodes A and B. Show that an ion will follow the semicircular path of radius r_0 if the potentials of the outer and inner...

Homework Statement An electron enters the area between two charged plates having a horizontal speed of 1.9E6. The space between plates is 1cm and the electron enters half way down from the top plate. The length of the plates is 2cm. Find the speed of the electron as it exists the space between...

Homework Statement The velocity distribution for laminar flow between parallel plates is given by u/umax = 1-(2y/h)2 where h is the distance separating the plates and the origin is placed midway between the plates. Consider flow of water at 15 0C with maximum speed of umax=0.05 m/s and h=5 mm...

Homework Statement An electron is projected with an initial velocity of 1.6x10^{6} m/s. If the electron just misses the upper plate as it emerges from the field, find the speed of the electron as it emerges from the field? Homework Equations Electric force equation The Attempt...

Casimir force increases when you put 2 plates closer and closer... But where is a limit? Obviously, Casimir calculations will not be valid when distance becomes less then a size of one atom. But I suspect that all these calculations break apart much earlier. Your thoughts?

Homework Statement A proton, accelerated from rest through a potential difference of 1.2 x 10^4 V, is directed at a fixed 5.0 x 10^-6 charge. a) What is the speed of the proton as it leaves the parallel plates? b) What is the distance d from the fixed charge when the proton is stopped...

Homework Statement Hey guys. Where is the force which is created by the electric field, directed to? I think it's towered the bottom plate but I'm not sure. 10x. Homework Equations The Attempt at a Solution

For our Manufacturing class, one of our take-home quizzes is to find out why, as surface roughness continues to decrease (think of very finely polished materials) the static friction between the plates as you try and slide them will increase. Basically, really rough surfaces will be hard to...

How does the thickness of the capacitor plates affect capacitance when the distance between the plates are comparable to the thickness of the individual plates?

Homework Statement In a vacuum diode, electrons are "boiled" off a hot cathode, at potential zero, and accelerated across a gap to the anode , which is held at positive potential V0. The cloud of moving electrons within the gap(called space charge) quickly builds up to the point where it...

I have this as an online assignment and think I have the wrong answer, but the site is telling me the result is wrong and takes a percentage off my grade each time i send a wrong submission. I am just posting an image link because that way you guys can see the picture...

Homework Statement In a cathode-ray tube (CRT), an electron travels in a vacuum and enters a region between two "deflection" plates which have equal and opposite charges. The dimensions of each plate are 12 cm by 4 cm, and the gap between them is 2.5 mm (not to scale in the diagram). During a...