What is Plates: Definition and 621 Discussions

According to Latter Day Saint belief, the golden plates (also called the gold plates or in some 19th-century literature, the golden bible) are the source from which Joseph Smith translated the Book of Mormon, a sacred text of the faith. Some witnesses described the plates as weighing from 30 to 60 pounds (14 to 27 kg), gold in color, and composed of thin metallic pages engraved with hieroglyphics on both sides and bound with three D-shaped rings.Smith said that he found the plates on September 22, 1823, on a hill near his home in Manchester, New York, after the angel Moroni directed him to a buried stone box. He said that the angel prevented him from taking the plates but instructed him to return to the same location in a year. He returned to that site every year, but it was not until September 1827 that he recovered the plates on his fourth annual attempt to retrieve them. He returned home with a heavy object wrapped in a frock, which he then put in a box. He allowed others to heft the box but said that the angel had forbidden him to show the plates to anyone until they had been translated from their original "reformed Egyptian" language.
Smith dictated the text of the plates while a scribe wrote down the words which would later become the Book of Mormon. Eyewitnesses to the process said Smith translated the plates, not by looking directly at them, but by looking through a transparent seer stone in the bottom of his hat. Smith published the first edition of the translation in March of 1830 as the Book of Mormon, with a print run of 5,000 copies at a production cost of $3,000 (or 60 cents per book).
Smith eventually obtained testimonies from 11 men who said that they had seen the plates, known as the Book of Mormon witnesses. After the translation was complete, Smith said that he returned the plates to the angel Moroni; thus they could never be examined. Latter Day Saints believe the account of the golden plates as a matter of faith, and critics often assert that either Smith manufactured them himself or that the Book of Mormon witnesses based their testimony on visions rather than physical experience.

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  1. Decimal

    Electric field of two plates separated by a spacial charge.

    Hello, I think I solved the question, but I am confused by the elaboration on the exercise given by my professor. 1. Homework Statement A very large plate charged with charge Q is placed between x = -d and x=0. A similar plate charged with charge 3*Q/2 is placed between x = 3*s and x = 3*s +...
  2. B

    Field between Parallel Plates in a Capacitor

    I guess it is a trivial fact that field must be ##(\phi_1 - \phi_2)/s## but I don't get how ? is there a derivation for it ?
  3. Pushoam

    Calculating force between capactor plates using virtual work

    Homework Statement Use “virtual work” to calculate the attractive force between conductors in the parallel plate capacitor (area A, separation z). That is, use conservation of energy to determine how much work must be done to move one plate by an infinitesimal amount, and then use the value of...
  4. curiosity colour

    About uniform electric field between parallel plates

    I have learned that the electric field between parallel plates are independent of distance since E=V/d so if I increase the distance between parallel plates, the E will decrease, right? if I am right on the previous statement, then why does the electric field are independent of distance?
  5. EM da Costa

    Calculate work done on charged object between plates

    Homework Statement I am trying to calculate the theoretical time that it takes for a small piece of aluminium foil on a bottom plate to reach a top plate. The plates have a potential difference created by a 3kV Cockcroft–Walton generator. The plates are short cylinders with a surface area of...
  6. sergiokapone

    Intensity of p-polarized light through stack of plates

    As one know, the intensity Fresnel equations for the reflected p-polarized light \begin{equation}\label{a} \frac{I_{p_{refl}}}{I_{0p}}=\frac {\tan^{2}(i-r)}{{\tan^{2}(i+r)}} \end{equation} and for the refracted one is \begin{equation}\label{b} \frac{I_{p_{refr}}}{I_{0p}}=1 - \frac...
  7. Arman777

    How Does Inserting a Dielectric Affect Capacitance and Potential?

    Homework Statement Homework EquationsThe Attempt at a Solution I couldn't find the V(x).I don't know ho to write the equation.I think that it will be constant cause potential betwwen two plates should be constant... ?
  8. Arman777

    Find the Capacitance -- Plates

    Homework Statement In attachments Homework Equations The Attempt at a Solution This is my charge distrubition.From there I draw electric field lines.And then from potential difference I wrote ##E=\frac {V} {d}## and then...
  9. mango99

    Vapor pressure of water between two heated plates on a press

    Hi, I'm trying to do some figuring on vapor pressures. If one were to take two plates heated to 220F and press water between them in a press that exerts 100psi, what would the resulting vapor pressure of the water be? Now, what temperature would you heat the plates to if you were using a press...
  10. ItsTheSebbe

    Velocity Charged Particle between Parallel Plates

    Homework Statement Can't really find out b, probably due to a mistake in a. Was wondering what I did wrong. Homework Equations Kinematic equations of motion, w/ constant a ##F=qE## The Attempt at a Solution [/B] (a) ##E=\frac {\Delta V} {\Delta d}= \frac {V_R-V_L} {L} = \frac {V_0}{L} ##...
  11. ikihi

    How much stored energy do the plates have?

    Homework Statement Two parallel circular plates with radius 7.0 mm carrying equal magnitude surface charge of Q = 4.618 x 10-10 C are separated by a distance of d = 1.0 mm (0.001 m). How much stored energy do the plates have? Homework Equations Acircle = π r2 C = ∈0⋅A / d PE = 1/2 ⋅ Q2 / C PE...
  12. T

    Electric field due to charged plates moving through a plasma

    Hi folks, this is not an actual HW question, but rather one of personal interest. I'm basically trying to understand your classic idealized parallel plate capacitor, but moving face-on through a plasma. 1. Homework Statement We have a diffuse neutral plasma made of free protons and electrons...
  13. M

    Difference Electric Field Strength Point Charges vs. Plates

    Why does the electric field strength on a straight line (E = k.(Q1/d12+Q2/d22). D1,2 = distance with respect to Q1,Q2) between two point charges vary with the location on this line while the field strength between two parallel plates which remains the same anywhere between the plates...
  14. Arman777

    Why electric field between two plates ##\frac {σ} {ε_0}## ?

    Why electric field between two plates ##\frac {σ} {ε_0}## ? Where is that came from ?
  15. J

    Charge between two metal plates

    Homework Statement Two large metal plates of area 1.1 m^2 face each other, 6.2 cm apart, with equal charge magnitudes but opposite signs. The field magnitude E between them (neglect fringing) is 50 N/C. Find |q|.Homework Equations |q|=σA E=σ/(2Eo)⇒σ=2EoE |q|=2EoEA The Attempt at a Solution I...
  16. P

    Electron/proton released from charged parallel plates

    Homework Statement Two parallel plates 1.40 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 the surface of the positive plate. How far from the negative plate is the point at...
  17. sliperyfrog

    An electron is launched between two plates

    Homework Statement An electron is launched between two parallel, neutral, conducting plates that are each L long and separated by a distance d with a uniform magnetic field of magnitude B permeated between them. (a) What is the minimum speed the particle must have to traverse the region...
  18. F

    Charge on pith ball between two plates

    Homework Statement The mass of the ball is 40 milligrams, the applied potential difference is 480 V and the plate separation is 6 centimeters. If the string hangs at an angle of 20 degrees to the vertical, determine the charge on the pith ball. Homework Equations [/B] F=ma E=F/q V=E/d The...
  19. SunRay-dvsh

    Oscillating Electron Beam potential between metal plates

    Take the case where the electron-beam is oscillating between two parallel metal plates, there will be alternating potential developed between the plates as metal tries to negate all external electric fields. My query is, (1) How to calculate the potential developed and possible way to simulate...
  20. Rod Alexei

    Point charge between two parallel plates (capacitor)

    1. Homework Statement A fixed parallel plate capacitor is charged. A point charge is starting to move with an initial speed 1.0 m/s at shown initial position. The capacitance is 5.0 F. The mass of the point charge is 0.80 kg. Assume that the plate length is infinite. No gravity. The initial...
  21. B

    Size of plates and how they create their boundaries

    also I need to know how the boundaries of Earth's plates are created and the size of the plates and also telling me how many are they? by listing them
  22. B

    I Quarter-wave plates and Half-wave plates

    Hi, I am aware that quater-wave plates create a phase shifts of λ / 4 between the fast and slow transmission axis. My question is what happens if we place two quater-wave plates in series so that there is 0 degrees between the fast transmission axis and how would result change if they where...
  23. M

    Temporary magnetization of Casimir effect plates?

    Have any experiments on the Casimir effect tried what happens if the plates are temporarily magnetized when they are pulled together by the effect? E.g. measurements of what happens to passing laser beams and the like?
  24. moenste

    Potential difference between two plates

    Homework Statement An α-particle accelerated between a pair of parallel plates in a vacuum tube acquires a kinetic energy of 103 eV. What is the potential difference between the plates? Answer: 500 V 2. The attempt at a solution Well, it's 1000 / 2 = 500 V because there are two plates. But I...
  25. G

    What do electric field lines look like for two metal plates?

    Hello. I'm now taking accelerator physics class and the lectures said in the thermionic electron gun, anode metal mesh should be grounded in order to prevent electrons which traveled beyond the mesh from coming back due to the electric field lines. Without grounding of the anode, I believe...
  26. S

    How Does Closing Switches Affect Charge Stored in Parallel Plate Capacitors?

    Homework Statement Four uncharged metal plates of the same area are placed in vacuum and separated by equal distances. They are connected by conducting wires to two resistors, two open switches and a battery. The thickness of the plates is negligible, and their area is sufficiently large. S1 is...
  27. B

    Polarized Molecule Between Charged plates

    If a polarised molecule, e.g NH3 or H20 (Vapour molecule) or Butane is between two plates, of opposite charge, would the charges serve to trap the molecule between the plates?
  28. Geth

    Model electrodes and plates in ANSYS

    Hello, I am trying to model an electric setup in ANSYS Workbench. I want to model some charged surfaces surrounded by charges. Then these are in an electric field created by two electrodes. I uploaded an image for visual aid. I have been playing around with the software for a while an am...
  29. J

    Electric Field Energy Density: Plates of Q & A

    Homework Statement Two large non-conducting plates of surface area A=.025m^2 carry equal but opposite charges Q = 75microC. What is the energy density of the electric field between the two plates. Homework Equations I wrote the equations on my attempt. This was a multiple choice problem...
  30. S

    Sample smaller than parallel plates in capacitance setup

    Hi, My setup for measuring parallel plate capacitance consists of an LCR meter and a parallel plate test fixture. The area of the parallel plates is much larger than the area of the samples I am measuring. From what I've seen in literature, and my physics classes, the sample area should be...
  31. P

    Force between capacitor plates

    What will happen to the force between the capacitor plates (Will increase or decrease or remain constant) if we introduce a dielectric between them? As per the answer given the physics textbook , the force will remain same? But as per my understanding the force should decrease since electrical...
  32. K

    Mass of charged sphere suspended between charged plates

    Homework Statement A small sphere with charge 2.4 micro coulombs is suspended from a thread between 2 charged plates. The plates have a voltage of 62 and the distance between the plates is 3.1 cm. The sphere hangs at 18 degrees to the vertical. Homework Equations E = V/r FE = Eq Fnetx = FE -...
  33. C

    Force between plates of a capacitor with dielectric and cell

    Homework Statement My teacher told me that the force will increase ##k^2## times, where ##k## is the dielectric constant, but I don't see how. Homework EquationsThe Attempt at a Solution To start with, with no dielectric, the force between the plates is given by ##\frac{q^2}{2A\epsilon_{0}}##...
  34. Ian Baughman

    Electric Fields (Uniformly Charged Plates)

    Homework Statement In the figure two large, thin metal plates are parallel and close to each other. On their inner faces, the plates have excess surface charge densities of opposite signs and magnitude 7.76 × 10-22 C/m2. What is the magnitude of the electric field at points (a) to the left of...
  35. F

    Gauss' Law between infinite plates

    Homework Statement The volume between two infinite plates located at x=L and x=-L respectively is filled with a uniform charge density ##\rho##. Calculate the electric field in the regions above, between and below the plates. Calculate the potential difference between the points x=-L and x=L...
  36. Biker

    Uncharged object between two charged plates

    Homework Statement Imagine if you have two charged plates which have the same magnitude but opposite in charges. If you place an uncharged object near of the positive plate what will happen? Homework Equations I don't think it depends on equations The Attempt at a Solution Okay, so If you rub...
  37. vetgirl1990

    Thin films: reflection between glass plates

    Homework Statement Two parallel glass plates of index of refraction n are separated by an air film of thickness d. Light of wavelength λ in air, normally incident on the plates, is intensified on reflection when, for some integer m a) 2d=mλ b) 2d=mλ/n c) 2d=mnλ d) 2d=(m+1/2)λ e) 2d=mλ/2...
  38. person_random_normal

    Electrostatics - System of parallel plates

    For a system of 'n' parallel plates(metal plates) bearing charges q1, q2,... qn ; why it is so that the facing surfaces of the plates bear equal and opposite charges ? How do we prove that ?
  39. C

    Combined resistance of plates made of different materials

    Homework Statement This problem propped in my head yesterday related to a project I'm working on (not homework, I'm not in school, but I thought this was the best place for it) and I just can't figure out how to crack it! If we have a large plate made up of nxn smaller plates, what is the...
  40. erick rocha

    Using Gauss's Law on two separated, and infinite plates

    Homework Statement The figure shows cross-sections through two large, parallel, nonconducting sheets with identical distributions of positive charge with surface charge density σ = 1.06 × 10-22 C/m2. What is the y component of the electric field at points (a) above the sheets, (b) between them...
  41. S

    Finding velocity given potentials of two parallel plates

    Homework Statement A charged particle (either an electron or a proton) is moving rightward between two parallel charged plates separated by distance d=2.87mm. The plate potentials are V1=-75.8V and V2=-49V. The particle is slowing from an initial speed of 90.0 km/s at the left plate. What is...
  42. A

    What is the maximum charge on plates when dielectric removed

    Homework Statement A capacitor with two parallel plates of area 88.5 cm2 and nylon (dielectric strength 14 MV/m) inserted between them breaks down when a potential difference of 5.80 kV is applied. What is the maximum charge the plates will hold when the nylon is removed and the space filled...
  43. M

    Magnitude of charge on parallel plates

    Homework Statement A small plastic ball of mass 7.51 × 10-3 kg and charge +0.123http://edugen.wileyplus.com/edugen/courses/crs6407/art/qb/qu/c18/lower_mu.gifC is suspended from an insulating thread and hangs between the plates of a capacitor (see the drawing). The ball is in equilibrium, with...
  44. P

    Is Work Required to Move Capacitor Plates Apart?

    If I have a capacitor and I maintain the potential difference between the two plates as I move them apart would I have to do any work (other than mechanical work) to move them apart? my logic tells be I shouldn't have to as I'm not doing any work again the potential field? Just wondered what you...
  45. H

    Electric fields between parallel plates

    Homework Statement Two large parallel plates are 0.8 m apart and generate an electric field of 12 N/C between them. At 0, 1/4, 1/2, 3/4, and full distance (0.8m), how much kinetic energy does a +0.25 C charge gain as it passes through each location? Homework Equations V = PE/q The Attempt...
  46. ft92

    Electric Field between two charged plates

    Homework Statement Two large, parallel, conducting plates are 7.5 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 1.3 × 10-15 N acts on an electron placed anywhere between the two plates. (Neglect fringing.) Find the magnitude...
  47. gracy

    Earthing of a System of Parallel Metal Plates

    whenever any plate of system of parallel plates is earthed total charge on outer faces of the plates will become zero .Is it always true?or only in case of system of two plates?
  48. D

    What happens of charges on other side of plates of capacitor

    When a capacitor is connected to battery then positive charge is induced on one plate and a negative charge is induced on another plate.Now what happens to the charges that are induced on opposite sides of each plate i.e. on plate with positive charge a negative charge would be induced on...
  49. J

    Using Peltier Plates for heating

    I know that peltier plates are for cooling(mostly :smile:) but I wish to try out heating other substances using peltier plates. I'm planning to use 3 peltier plates (TEC1-12712) [maximum temperature difference of 70 degrees measured at 25 degrees / Maximum temperature difference of 80 degrees...
  50. leviterande

    Wake drag of moving/stationary flat plates: Not identical?

    Hi All! See the picture. A-Consider a flat plate physically moving perpendicularly through the air. B-Consider this same flat plate sitting perpendicularly and stationary now in a wind tunnel where air is made to flow. Accordingly if airspeeds, areas etc are similar, the 2 situations...
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