Parallel plates Definition and 157 Threads

A parallel-plate fluid flow chamber is a benchtop (in vitro) model that simulates fluid shear stresses on various cell types exposed to dynamic fluid flow in their natural, physiological environment. The metabolic response of cells in vitro is associated with the wall shear stress.
A typical parallel-plate flow chamber consists of a polycarbonate distributor, a silicon gasket, and a glass coverslip. The distributor, forming one side of the parallel-plate flow chamber, includes inlet port, outlet port, and a vacuum slot. The thickness of the gasket determines the height of the flow path. The glass coverslip forms another side of the parallel-plate flow chamber and can be coated with extracellular matrix (ECM) proteins, vascular cells, or biomaterials of interest. A vacuum forms a seal to hold these three parts and ensures a uniform channel height.Typically, the fluid enters one side of the chamber and leaves from an opposite side. The upper plate is usually transparent while the bottom is a prepared surface on which the cells have been cultured for a predetermined period. Cell behavior is viewed with either transmitted or reflective light microscope.

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  1. G

    Hey asume i have conected up parallel plates but of different areas

    Hey asume i have conected up parallel plates but of different areas with a given potential difference ie battery, what hapens 2 the plates actualy i expect a uniform field, but how can we obtain that since we would require same potential on each plate! and secondly i expect both plates to...
  2. W

    Understanding the E-Field Between Parallel Plates

    I'm not sure if this qualifies as a 'homework question'. There is no specific problem...I have a question about something in the text. I posted in 'Classical physics' with no luck. Maybe someone can help me here? It gives the situation of a conducting plate with charge density sigma 1 on...
  3. W

    Why Is the Electric Field Between Parallel Plates Not What I Expected?

    I'm not sure if this qualifies as a 'homework question'. There is no specific problem...I have a question about something in the text. It gives the situation of a conducting plate with charge density sigma 1 on each side. The E field on each side due to the conducting plate is = sigma...
  4. L

    A pair of oppositely charged, parallel plates are separated

    Homework Statement A pair of oppositely charged, parallel plates are separated by a distance of 5.0 cm with a potential difference of 500 V between the plates. A proton is released from rest at the positive plate, and at the same time an electron is released at the negative plate. Neglect any...
  5. J

    Motion in Fields (two parallel plates when voltage is applied)

    Homework Statement Two parallel metallic plates are placed horizontally with a separation of 2.2mm. When the voltage is reduced to zero (so that the plates are neutral), the particle (or sphere) is observed to fall with constant velocity. It is observed to travel 0.85 mm in 8.9s. A new p.d. V...
  6. P

    Parallel Plates - Electron Liberation

    Homework Statement Hello, I wonder if anyone could check my answer to this problem. Thanks in advance An electron is liberated from the lower of two parallel plates separated by a distance of 5mm. The upper plate has a p.d. of 1000v relative to the lower plate. How long does it it take for...
  7. P

    Parallel Plates and Electric Fields

    Homework Statement Would it be possible for someone to check my answer to this past examination question, as I am not sure I'm doing them correctly! Thanks in advance. A negatively charged oil drop, mass 2.4 x 10^–12 kg, is stationary between two horizontal metal plates spaced 1 cm apart...
  8. M

    Calculating Voltage from Electric Field between Parallel Plates

    Homework Statement Electrons, which evaporated from the filament accelerated in homogeneous electric field that was created by using two parallel metal plates, connected to the voltage V = 1 kV. The resulting stream of electrons is deviated from the initial direction for a φ = 15 ° in...
  9. M

    Calculating the voltage and electric field strength between two parallel plates

    Homework Statement - How much is the electrical voltage U between two evenly electrified parallel flat plates, distanced d = 1 cm, if the strength of electric field between them is E = 1 V / m? - - What is the strength of electric field to the left and to the right of each plate? - What is...
  10. S

    Parallel plates, calculate charges and E. fields without surface area?

    Homework Statement two metal plates 10mm thin are held a distance 40mm apart with a P.D. 10V across them. +ve plate on left. In between the plates is a vacuum (free space basically). Calculate the charges and electric fields within this system.Homework Equations Q=VC C = εo.A/d No surface area...
  11. F

    Electrical Potential Difference between parallel plates

    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...
  12. L

    Ampere's Law and two conducting parallel plates

    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...
  13. O

    Electrical force on parallel plates

    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...
  14. U

    Flow between parallel plates or not.

    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...
  15. A

    Force between parallel plates in a capacitor

    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...
  16. I

    Question about distribution of electric charges on two parallel plates

    Here is a problem I made up, in order to try to understand electrostatics of conductors better. Suppose two large square parallel conducting plates, are in space. One has a charge of Q, and another has a charge of -q. They are put close together, from a separation of L, to a separation of l...
  17. T

    Electric Potential Difference Question (Parallel plates, higher potential)

    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...
  18. H

    How Is Force Calculated Between Charged Parallel Plates?

    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...
  19. H

    Fluid flow between parallel plates

    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...
  20. O

    Electric force between 2 parallel plates

    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...
  21. I

    Parallel Plates Homework: A Proton Accelerated From Rest

    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...
  22. B

    Conductor problem in which the conductor consists of two parallel 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...
  23. A

    Parallel Plates Capacitors (Conceptual)

    Homework Statement The sketch below is a side view of two capacitors consisting of parallel plates in air. The capacitor plates are equal in area but the plate separation differs as shown. Individual capacitors are specified with two letters, for example RS is a single capacitor. The charge on...
  24. C

    Changes to electric field between two parallel plates

    Homework Statement The electric field intensity at a point between two large parallel plates is 4.8 x 10^2 N/C. What does the electric field become as a result of each of the following changes, considered separately: a) when the amount of charge on each plate is tripled b) when the...
  25. D

    Electric Fields and Parallel Plates

    I just want to know if I'm even given enough information in this question to generate an answer. I don't need an actual answer. Thanks. "An electron is fired from a negative plate towards a hole in a positive plate. It then passes between two parallel plates that are 5 cm long and 3 cm...
  26. D

    Electric Field Between Two Parallel Plates

    [SOLVED] Electric Field Between Two Parallel Plates My textbook says that the magnitude of the electric field at any point between two plates (except near the edges) depends only on the magnitude of the charge on each plate. For example, if the magnitude of the electric field between two...
  27. V

    Capacitance of parallel plates as a function of distance

    Capacitance= (permitivity x Area of overlap)/ distance between two plates Why is capacitance inversely proportional to the distance between two plates? I understand that C=Q/V. So capacitance is the amount of charge it takes to change the potential difference between the two plates by 1...
  28. ~christina~

    Parallel plates with a mass m at an angle

    Homework Statement An object of mass m carries a charge q and is supsended by a thread between the vertical plates of a parallel plate capacitor. The plate separation is d. If the thread makes an angle \theta with th evertical, what is the potential difference between the plates? Homework...
  29. U

    Calculate Speed of Electron Reaching Plate B in Parallel Plates

    Homework Statement Two oppositely charged parallel plates, 13.0 cm apart, have a uniform electric field between them. Vb − Va = +25.0 V. An electron with a mass of 9.11 × 10−31 kg and a charge of −1.60 × 10−19 C is released from rest at plate a. Calculate the speed of the electron when it...
  30. D

    Charged parallel plates, proton and electron released simultaneously

    [SOLVED] Charged parallel plates, proton and electron released simultaneously Homework Statement Two parallel plates 0.700 cm apart are equally and oppositely charged. An electron is released from rest at the surface of the negative plate and simultaneously a proton is released from rest at...
  31. J

    Net electrostatic force on charge between parallel plates

    I am having some trouble getting started with this problem. Do I want to use kq/r^2 at all or should I be doing something else? The problem is: Two point charges, Q1=-6.7 microCoulombs and Q2= 1.3 microcoulombs, are located between two oppositely charged plates. (The positively charged...
  32. M

    Function profile of toothed and plane parallel plates, then fourier transform.

    I want to write the dielectric profile of the following system, so I can then write its Fourier transform as an integral... The plates are semi-infinite. So far I have: Epsilon, for: -infinity < z <= 0 1, for: 0 < z < ? Epsilon, for: ? <= z < +infinity I need to find the...
  33. G

    What Happens to Capacitance and Charge in Isolated Parallel Plates?

    which statements are true for two oppositely charged, isolated parallel plates: C=capacitance, U=stored energy, (Q and -Q =charged on the plates). Note: isolated plates can not lose their charge. a. when the distance is doubled, U increase. b. inserting a dielectric increases Q c. when...
  34. E

    Calculating Charge on Parallel Plates

    Homework Statement An electron starts from one plate of a charged closely spaced (vertical) parallel plate arrangement with a velocity of 1.63 x 10^4 m/s to the right. Its speed on reaching the other plate, 2.10 cm away is 4.15x10^4 m/s I got parts a and b - part C is what I'm having...
  35. S

    Electric Fields in Parallel Plates

    1. The magnitude of the electric field between two plates of a parallel plate capicitor is 4.7 x 10^4 N/C, if the charge on each plate increases by a a factor of 3, what happens to the electric field? increase by a factor of 3 or 9? decrease by a factor of 3 or 9? not effected? 2...
  36. S

    Explaining the Uniform Electric Field Between Parallel Plates

    I heard that two flat conducting parallel plates have the property that electric field at any point between them, is uniform, and of constant magnitude. I was wondering how this was possible. For example, a test charge closer to the positive plate conpared with a test charge closer to the...
  37. P

    Electric Field: non parallel plates?

    Hi, I'm in the process of completing my physics coursework (A-level) and have run into a bit of a problem: I am trying to find a general equation for a plate capacitor, where the plates aren't parallel. I've always seen the parallel plate capacitor equation: C = \frac {\epsilon A}{d}...
  38. S

    Parallel Plates and Electric Field

    Homework Statement The electrostatic potential energy of a system of point charges q1 = 1 µC, q2 = 2 µC, and q3 = 3 µC at the corners of an equilateral triangle whose side s = 30 cm is a. 1.10 J b. 0.990 J c. 0.631 J d. 0.330 J e. 0.123 J Homework Equations See...
  39. S

    Electric Field Between Oppositely Charged Parallel Plates

    Homework Statement An infinite plane of charge with surface charge density sigma = 8.00 nC/m^2 lies in the yz plane at the origin, and a second infinite plane of charge with surface charge density sigma = -8.00 nC/m^2 lies in a plane parallel to the yz plane at x = 4.00 m. The electric field...
  40. F

    Non ideal parallel plates (really quick question)

    I'm writing a report about using numerical techniques to solve a simple parallel plates capacitor problem. Would it be proper to say that there is no closed form solution to Lapalces equation when dealing with fringing effects? Isn't this the reason why we use numerical techniques to solve...
  41. F

    Electromagnetics - parallel plates (Poisson/Laplace)

    I'm not sure where to post this. It's for an engineering class, but it's more a question about the math. I'm following an example along in my book, and I just need a little help understanding it: (Q) There are two plates of a parallel-plate capacitor that are separated by a distance d and...
  42. T

    Why does C=Eo*Er*(A/d) equate to parallel plates?

    Hi, Why does C=Eo*Er*(A/d) only work for a parallel plate geometry? Which part of it dictates its exclusivity to a parallel geomtery? Why can't I make the plate separation, d the distance between two adjacent (coplanar) plates and it give me the capacitance of that geometry? Any links...
  43. G

    Voltage dealing with two parallel plates

    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...
  44. T

    Finding the E-Field between parallel plates

    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...
  45. F

    Electric fields and parallel plates

    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...
  46. F

    Calculating Shear Stress on Parallel Plates at 15 deg C

    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...
  47. A

    Charge distribution on parallel plates

    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...
  48. M

    Parallel plates - direction of electric field

    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?
  49. F

    Parallel Plates and charge density

    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...
  50. G

    Physics true/false questions v. isolated parallel 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...
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