Parallel plate Definition and 259 Threads

  1. T

    Magnetism, Displacement Currents and Parallel Plate Capacitors

    Homework Statement The preceding problem was an artificial model for the charging capacitor, designed to avoid complications associated with the current spreading out over the surface of the plates. For a more realistic model, imagine thin wires that connect to the centres of the plates (see...
  2. C

    Velocity of a particle in a parallel plate, electric field problem

    Homework Statement A particle with a mass of 2.0 x10^-5 kg and a charge of +2.0 microColoumbs is released in a (parallel plate) uniform horizontal electric field of 12 N/C a) HOw far horizontally does the particle travel in 5.0 s? b) What is the horizontal component of its velocity at...
  3. L

    How Does Membrane Thickness Affect the Electric Field in a Nerve Cell?

    The cell membrane in a nerve cell has a thickness of 0.12 micrometers. (a) Approximating the cell membrane as a parallel plate capacitor with a surface charge density of 5.9 x 10^(-6) C/m2, find the electric field within the membrane. (b) If the thickness of the membrane were doubled, would...
  4. K

    How Does a Parallel Plate Capacitor with Different Dielectrics Calculate Keq?

    A parallel plate capacitor is constructed such that there are two different dielectric materials in between the plates, each occupying half the space in between . Still this capacitor can be modeled as a simple parallel plate capacitor with same total area A, plate separation d, but with an...
  5. J

    Parallel Plate Capacitor (work and potential difference)

    Homework Statement Professor Milly Coulomb finds it takes 3.0 J of work to drag, at constant speed, a -9.0 mC charge between the plates of a parallel plate capacitor. (a) What is the work done by the electrical force in taking the charge between the plates? (b) What is the potential...
  6. S

    Circuit with a parallel plate capacitor

    Homework Statement 1.) Consider a parallel plate capacitor with plates of area 1.36 m2 whose plates are 1.24 cm apart. The gap between the plates is filled with air (assume that κair is unity) and the positive plate has a charge of 10.5 nC on it while the negative plate has a negative charge...
  7. F

    Parallel Plate Capacitors Being Separated

    Homework Statement A parallel-plate air capacitor is made by using two plates 10 cm square, spaced 4.7 mm apart. It is connected to a 15 V battery. If the plates remain connected to the battery and the plates are pulled apart to a separation of 9.9 mm. What is the new capacitance? What is...
  8. H

    Current through parallel plate capacitor vibration sensor

    Homework Statement A parallel plate capacitor is used as a vibration sensor. The plates have an area of 100cm^2, the dieelectric is air, and the dist between the plates is given by d(t)=1+.01 sin(200 t) mm A constant voltage of 200 V is applied to the sensor. Determine the current...
  9. N

    Finding the electric field magnitude in a parallel plate compacitor.

    Problem: The drawing shows an electron entering the lower left side of a parallel plate capacitor and exiting at the upper right side. The initial speed of the electron is 9.42 x 10^6 m/s. The capacitor is 2.00 cm long, and its plates are separated by 0.150 cm. Assume that the electric field...
  10. S

    Parallel plate capacitor problem

    1.) Consider a parallel plate capacitor with plates of area 1.36 m2 whose plates are 1.24 cm apart. The gap between the plates is filled with air (assume that κair is unity) and the positive plate has a charge of 10.5 nC on it while the negative plate has a negative charge of equal magnitude on...
  11. Y

    Parallel Plate Capacitor True or False

    I keep getting the questions wrong. I'm so frustrated. I'd appreciate it if anyone can tell me what's wrong. Which statements are correct/incorrect for two oppositely charged, isolated parallel plates (Isolated means that the charge stays constant ): (C=capacitance, U=stored energy, +Q and...
  12. S

    Parallel plate capacitor and dielectric

    Homework Statement a parallel-plate capacitor (2 plates) is filled with titanium dioxide which has a dielectric constant of 80. the area of each plate is 1 cm^2. a) what must be the spacing between the plates if one wishes to make a 10^-10 farad capacitor? b) if the dielectric strength...
  13. S

    How Do You Calculate the Capacitance of Two Charged Parallel Plates?

    Homework Statement two parallel plates have equal and opposite charges of 0.01 coulombs. the electric field between the plates is 10^5 Newtons/coulomb and the separation between the plates is 2mm. what is the capacitance of the plates? Homework Equations capacitance C = Q/V where Q is charge...
  14. S

    How Is the Potential Difference Calculated in a Suspended Charge Scenario?

    A point charge of mass 0.0836 kg and charge q = +6.84 μC is suspended by a thread between the vertical parallel plates of a parallel-plate capacitor, as shown in the figure below. If the angle of deflection is θ = 22.3°, and the separation between the plates is d = 0.0221 m, what is the...
  15. R

    Distance-Varying Electric Field and Voltage of Parallel Plate Capacitors

    Homework Statement I encountered the following capacitor problem on a recent test and it has brought up a couple of questions about the voltage and electric field of parallel plates. In summary my questions are: 1) How is the electric field between parallel plates quantitatively related...
  16. S

    Parallel plate capacitor find the volts

    A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. The capacitor is then disconnected from the battery, without any of the charge leaving the plates. A.) A voltmeter reads 50.0 V when placed across the capacitor. When a dielectric is...
  17. D

    Magnetic field for parallel plate capacitor

    Hello hello, What is the b-field for a parallel plate capacitor if the current J was found to be in the z-direction? I am told it will be in the z-direction as well. How so? Thanks so much!
  18. R

    More than one dielectric ibetween a parallel plate capacitor

    Hey, I am having some troubles with this question, the question asks me to calculate the capacitance of a parallel platecapacitor where the plates are separated by 3mm, and in between the are three layers of dielectric 1mm thick with different relative permitivities. Do I find the total by...
  19. E

    Electron in a parallel plate capacitor

    https://www.physicsforums.com/showthread.php?t=62593 I'm not quite sure how to obtain acceleration even after reading the suggestions. Help? Thank you.
  20. V

    Work Done on a Parallel Plate Capacitor

    Homework Statement An isolated 5.60 microfarad parallel-plate capacitor has 4.90 mC of charge. An external force changes the distance between the electrodes until the capacitance is 2.00 microfarads.Homework Equations W = Fd c = Q/VThe Attempt at a Solution My first instinct was to solve to the...
  21. tony873004

    Parallel plate capacitor and charge density

    Homework Statement A parallel plate capacitor with A=125 cm2 and d=1.25 mm is charged to a potential difference of 10.0 V. What is the charge density on each plate? Homework Equations V = \frac{{\sigma d}}{{\varepsilon _0 }}\,\,\,\, \Rightarrow \,\,\,\,V\varepsilon _0 = \sigma...
  22. S

    Parallel plate capacitor problem

    [SOLVED] Capacitor problem Problem: A parallel plate capacitor with adjustible plate separation d and adjustible area A is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V Volts. (C is the capacitance and U is the stored energy.) Give all correct answers...
  23. B

    Dielectric Help: Solving Parallel Plate Capacitor

    [SOLVED]Dielectric help Homework Statement To make a parallel plate capacitor, you have available two flat plates of aluminum (area = 180 cm2), a sheet of paper (thickness = 0.10 mm, k= 3.5), a sheet of glass (thickness = 2.0 mm, . k= 7.0), and a slab of paraffin (thickness = 10.0 mm, k=...
  24. S

    Area of a Parallel Plate capacitor. Pi*r^2?

    Hi, I was just going through a question in my Physics textbook today. In calculating the electric field (E=sigma/epsilon0) ... sigma = charge density = q/Area ... they have used the area as pi*r^2, I can't understand why this was done? shouldn't the area of the parallel plate capacitor be...
  25. X

    Calculating Vertical Deflection of Electron in Parallel Plate Setup

    Question: An electron with a velocity of 3.00x10^6m/s[horizontally] passes through two horizontal parallel plates, as in the attached diagram. The magnitude of the electric field between the plates is 120N/C. The plates are 4.0cm across. Edge effects are negligible. a) Calculate the vertical...
  26. S

    Parallel plate capacitor (voltage and charge relative to distance)

    Hi all. I'm struggling to understand something about PP capacitors. Let's say there is no battery connected to a PP capacitor. Why does the potential (V) INCREASE when the plates are moved farther apart? - we know that: dv = -Ed (in a constant E) however as d increases, E...
  27. T

    Calculate Surface Charge Densities for Parallel Plates

    2 infinite parallel plates separated by a distance s are at the potentials zero and V0. find the surface charge densities on the plates. I got the answer that it first calculate E and then as 1. x=o, Ex = σ / ε, then could know σ 2. x=s, Ex = - σ / ε ---> here's what I don't know. why...
  28. M

    Charge on Parallel Plate Capacitor

    I am having a really tough time providing an argument for myself over why the answer is true: The question: A parallel plate capacitor is attached to a battery that supplies a constant potential difference. While the battery is still attached, the parallel plates are separated a little...
  29. P

    Parallel plate capacitor and magnetic field

    Homework Statement A parallel plate air-filled capacitor is being charged as in figure. The circular plates have a radius of 4.0 cm, and at a particular instant the conduction current in the wires is .280 A. A. What is the displacement current density (jD) in the air space between the...
  30. L

    How Do You Calculate the Force in a Parallel Plate Capacitor?

    The problem is: 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. Express your answer in terms of given quantities and...
  31. B

    How Do You Calculate the Potential Difference in a Parallel Plate Capacitor?

    A parallel-plate capacitor has an area of 4.77 cm2, and the plates are separated by 1.06 mm with air between them. It stores a charge of 403 pC. What is the potential difference across the plates of the capacitor? alright so i changed the area to .0477m^2. then i changed the distance between...
  32. N

    Parallel plate capcitor displacement current magnitude

    Homework Statement Use an integral form of the Gauss law to show how the magnitude of D inside the capacitor depends on the charge on the plates of a parallel plate capacitor and their area. Homework Equations Gauss \int{E.nda}=\frac{\rho}{\epsilon_{0}} \nabla.D=\rho where div...
  33. G

    Laplace equation for parallel plate condersers

    I've recently started studying Laplace's equation and it's solution under various simple circumstances in electrostatics. I tried to solve the equation for a parallel plate condenser system, but I couldn't meet the boundary conditions. I had two plates, one placed on xz plane at y=0 (with...
  34. M

    How Does Increasing Plate Separation Affect Capacitor Energy Storage?

    Homework Statement A parallel-plate capacitor has plates with an area of 445 cm2 and an air-filled gap between the plates that is 1.51 mm thick. The capacitor is charged by a battery to 575 V and then is disconnected from the battery. There is 4.311536113 x 10 ^-5 J of energy stored in the...
  35. C

    Electric Field and two parallel plate capacitors

    If you have two parallel plate capacitors side by side and the electric field in one is constant. If you vary the electric field in the other, will it interfere with the electric field that was constant?
  36. D

    Energy input for Parallel Plate Capacitors

    I'm supposed to show that while a capacitor is being charged, the energy flows into the region between the plates at the same rate as the electrostatic energy in the capacitor increases. I'm not sure exactly what is being asked of me... are there formulae for these? I feel stupid.
  37. F

    Electromagnetics - Parallel Plate Capacitor [so stuck ]

    I'm stuck. Here's the question, Q: The upper and lower conducting plates of a large parallel-plate capacitor are separated by a distance d and maintained at potentials V_0 and 0 , respectively. A dielectric slab of dielectric constant 6.0 and uniform thickness 0.8d is placed over the...
  38. P

    The Parallel Plate Capacitor and Gauss Law

    Hi Can anyone please explain Gauss Law in simple terms for me? I really don't understand the electric flux and formulas in this law. My book is very short on explaining this law.
  39. P

    The Parallel Plate Capacitor and Gauss Law?

    The Parallel Plate Capacitor and Gauss Law? Hi I really do not understand these two things. I read like every single book on this things but still am a lot confused about these two concepts. Can anyone explain me in the most simplest terms of all? I would really appreciate that. What is this...
  40. M

    Parallel plate capacitor capcitance question?

    I know that the capacitance is depended on area and distance etc etc. However, can someone explain to me the statement that as the area increases the, Elctrical field decreases. C would increase because of the area, and V would decrease because of the E, so for this scenario would the charge...
  41. P

    Calculation involving Parallel Plate Capacitor

    Hi, I've a problem with this question and I'm not sure if I've worked it out correctly. This is the question: The membrane that surrounds a certain type of living cell has a surface area of 5.0 mm2 and a thickness of 10 nm. Assume that the membrane behaves like a parallel plate capacitor...
  42. A

    Charging a parallel plate capacitor

    Hi guys, I've been reading the forums and finally I have something to post :smile: I've got a question regarding charging parallel plate capacitors. Take this for example: Connect a 6 Volt power supply to a resistor of 2Mohm and in series with a 15uF capacitor initially uncharged, with...
  43. T

    Parallel Plate Capacitor and distance

    I'm going through my book and one of the Example exercises has the following problem: Two plates, each of area 3X10^-4 m^2 are used to construc a parallel-plate capacitor with capacitance 1 pF. (a) Find the necessary separation distance. Seems pretty obvious right? C = Eo(A/d) So, I...
  44. P

    Parallel plate capacitor problem

    A capacitor is constructed from 2 square metal plates. A dielectric k= 4.93 fills the upper half of the capacitor and a dielectric k=10 fills the lower half of the capacitor. Neglect edge effects. The plate are separated by a distance of 0.37 mm and the length of the plates is 27 cm. Calculate...
  45. P

    Parallel plate capacitor electric charge

    Consider an air filled parallel plate capacitor with plate area A and gap width d. The plate charge is Q. The total energy stored in the capacitor is given by U= Q^2 *d /2 E_o A. With the battery connected, fill the gap by a slab with the dielectric constant k. Given : E= 70 V, k= 3.8, d=0.8 mm...
  46. Reshma

    Magnetic field for parallel plate capacitors

    From Griffiths again! A large parallel plate capacitor with uniform surface charge \sigma on upper plate and -\sigma on lower is moving with a constant speed v. Q1]Find the magnetic field between the plates and also above and below them. My work: For a surface charge distribution: \vec K =...
  47. S

    Electric field & Parallel plate Capacitor

    Question When a nerve impulse propagates along a nerve cell, the electric field within the cell membrane changes from 7.0 x 10^5 N/C (pointing in one direction) to 3.0 x 10^5 N/C (pointing in the other direction). By approximating the cell membrane as a parallel-plate capicator, find the...
  48. S

    Measuring Dielectric Constants of Materials in a Parallel Plate Capacitor

    I wanted to find the dielectric constant of different materials placed in a parallel plate capacitor using the equation: K = \frac{E_{dielectric}}{E_{original}} Where E = \frac{V}{d} I would use sensors connected to a computer to measure the voltage and i could easily measure the...
  49. M

    How Does a Charged Ball in Equilibrium Calculate the Charge on Capacitor Plates?

    A small plastic ball of mass 6.70×10-3 kg and charge +.0150 uC is suspended from an insulating thread and hangs between the plates of a capacitor. The ball is in equilibrium, with the thread making an angle of 30.0° with respect to the vertical. The area of each plate is 0.0200 m^2. What is the...
  50. X

    Electric Field and Energy of Parallel Plate Capacitor

    A parallel plate capictor with a plate area of 1.8 m^2 and a separation of 0.1 mm is charged to 200V. a. what is the electric field bwt. the plates? b. what is the energy/unit volume in the space between the plates? c. Find the capacitance C d. Calculate the total energy stored in this...
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