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. I

    How Much Work Is Required to Double the Separation of Charged Parallel Plates?

    two parallel plates of area A is separated by a distance d. One plate has positive charge distribution with area chrage density \sigma and the other plate has an area charge density -\sigma how much work does it take to move the plates 2d? W=Fd=QEd' i'm not sure what to use for the Q or the...
  2. X

    A dielectric is inserted between the plates of a capacitor.

    A dielectric is inserted between the plates of a capacitor. The system is charged and the dielectric is removed. The electrostatic energy stored in the capacitor is 1. greater than 2. the same as 3. smaller than it would have been if the dielectric were left in place. U= 1/2 (K)EAd E^2 K=...
  3. M

    Non-coductive material but thermal conductive plates

    i have a project of making electric stove for that top portion a plate like cover for transfering heat over 500degree and nonconductive material in thin of 2mm and dia over 160mm the material whatever may be with good surface.This is good product for cooking with low cosuption of power, for ten...
  4. M

    Induced charge - infinite plates

    No numbers here - purely conceptual. Two thin plates carry total surface charge densities of \sigma and \sigma_{1} respectively. An uncharged conducting slab is placed in between the charged plates, and then above \sigma. What are the induced charged densities on the surfaces of the...
  5. M

    Induced charge between/above infinite charged plates

    No numbers here - purely conceptual. Two thin plates carry total surface charge densities of \sigma and \sigma_{1} respectively. An uncharged conducting slab is placed in between the charged plates, and then outside \sigma. What are the induced charged densities on the surfaces of the...
  6. 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...
  7. 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...
  8. A

    Why electric field line are curved at top of two plates.

    Hello. I can't understand that why electric field lines are radial between two parallal plates but curved at the end.? what is the reason.
  9. B

    Outside the capacitor plates E is zero how potenital the same

    hi, We see theoretical discussion of Electric field inside the charged capacitor is confined in the space between the plates and E.d = potential difference between plates. Considering the battery terminal(let us say positive terminal), wire and left plate or top plate, being in the same...
  10. L

    Conducting Plates, electrical fields w/ conductor.

    1.Two plates placed a distance "D" apart. One charged +Q, the other -Q. An uncharged slab of metal is placed between the plates. 2. Does this slab change the electric field outside or between the plates (but outside the slab)? Do forces exerted on particle sitting between the plates (but...
  11. 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...
  12. 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...
  13. K

    Potential difference and kinetic energy between plates

    A point charge q = −2.40 nC is initially at rest adjacent to the negative plate of a capacitor. The charge per unit area on the plates is 4.50 µC/m2 and the space between the plates is 6.50 mm. (a) What is the potential difference between the plates? kV (b) What is the kinetic energy of...
  14. U

    Simple AutoCAD question (plates)

    Hey guys, I not similar to autocad at all and you know now its really difficult to me. I can even draw these stuff. If some one can help me out with these sample plates I will be so glad. *Complete the top view on the space provided: http://rapidshare.com/files/29181074/152222.dwg.html*draw...
  15. G

    Charge on object between two charged plates Problem

    Homework Statement http://aycu16.webshots.com/image/13135/2004772066267823450_rs.jpg The mass of the ball is 40 milligrams, the applied potential difference is 480 V and the plate separation is 6 cm. If the string hangs at an angle of 20deg to the vertical, determine the charge on the...
  16. L

    Two glass plates - next dark fringe?

    Question Two glass plates 10.0 cm long are in contact at one end and separated at the other end by a thread 0.0500 mm in diameter. Light containing the two wavelengths 400 nm and 600 nm is incident perpendicularly. At what distance from the contact point is the next dark fringe? Relevant...
  17. H

    Plates in a CRT and how they become charged

    I just am trying come up with a hypothesis regarding the plates in a CRT system? How do they become charged? Looking at when an electron travels between the two plates, say the plates are on the top and bottom and the top plate is positively charged and the bottom is negatively charged, we...
  18. R

    Can Non-Microwave Safe Plates Cause Explosions in a Microwave Oven?

    Would plates that are not marked "microwave safe" explode in a microwave oven or crack slowly?
  19. 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}...
  20. 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...
  21. S

    Opposite Charged Plates with Sphere

    Homework Statement A small sphere with mass 2.90 g hangs by a thread between two large parallel vertical plates 0.05 m apart. The plates are insulating and have uniform surface charge densities + \sigma and - \sigma . The charge on the sphere is q = 9.70×10^6 C. What potential difference...
  22. 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...
  23. S

    Spheres, Plates, and Gauss' Law

    Homework Statement A sphere of radius 8.0 cm carries a uniform volume charge density rho = 500*10^-9 C/m^3. What is the electric field at r = 3.0 cm? a.36.0 N/C b.230 N/C c.140 N/C d.565 N/C e.450 N/C Homework Equations E = (k*Q*r)/(R^3), where...
  24. A

    The force tha apears betwin the plates of a capacitor

    helo :smile: have a proble here can someone help me out? supouse i know the surface of the plates of a capacitor ( that are flat surfaces place one in front of anougthere ) the distance bethwin them and the charge. how do i calculate the force that apears betwin them?
  25. 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...
  26. J

    Capacitor Plates: E Field Outside or Between Plates?

    Hello, Quick question. If you have a parallel plate capacitor charged with X volts. Is there a detectable E field outside the plates at all or only between the plates? Thanks, Jason O
  27. 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...
  28. 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...
  29. T

    Capacitance of coplaner (adjacent) plates

    Hi, Does anyone know an equation/approximation/model or other to estimate the capacitance between two coplanar (adjacent) plates? I know that for parallel plates: C = E0*Er*(A/d). I also know that the capacitance decrease as the plates move from a parallel to a coplanar geometry as the...
  30. M

    Point charge between two conducting plates

    Two infinite conducting plates 1 and 2 are separated by a distance l. A point charge q is located between the plates at a distance x from plate 1. Find the charges induced on each plate. I solved this problem assuming (intuitively) that a potential difference between plate 1 and 2 equals 0 and...
  31. E

    Electric field due to || CONDUCTING plates

    Hello, I am interested if ANYONE can point a mistake in my reasoning... I am constantly getting a result that is 2X greater than the textbook derivation. The problem is this: We have 2 CONDUCTING, infinitely large, oppositely charged plates (far away), each with a charge distribution of...
  32. T

    Confirming: Is Electric Field Double between Oppositely Charged Plates?

    obvious question IMO, but just need to make sure before test. if you have two parallel conducting plates, and apply charge to one of them, then the field between them is half, compared to if the plates were acting as an air capacitor ie. both plates oppositely charged? thing is, when I use...
  33. F

    What is the voltage across the capacitor plates

    Am I overthinking this problem? A 15uF capacitor is connected ot a 55V battery and becomes fully charged. The battery is removed and the circuit is left open. A slab of dielectric material is inserted to completely fill the space between the plates. It has a dielectric constant of 4.8...
  34. L

    Solving PDEs: Finding the Solution to Temperature Plates Touching After 10min

    there's something about these PDE:s that I don't understand, can't find out how it really works. Here comes a problem that we can discuss. 2 equal 0.2m think iron plates got the temperatures 100 and 0 degree C from the beginning. At the time t = 0 are these 2 plates laid next to each other...
  35. O

    Potential difference of plates

    Can anyone help me with a hint of some sort? I am lost... A small sphere with mass 1.50 g hangs by a thread between two parallel vertical plates 5.00 cm apart. The plates are insulating and have uniform surface charge densities + and -. The charge on the sphere is q = 8.90 10-6 C. What...
  36. K

    Potential difference between two plates

    The problem says that there are two parallel plates having charges of equal magnitude but opposite signs and they are separated by 16cm. Each plate has a surface charge of 31 nc/m2(sorry don't know how to superscript). I need to find the potential difference between the plates. I thought I...
  37. 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...
  38. 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...
  39. 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...
  40. maverick280857

    Point charge placed in the vicinity of two plates

    Hello all.. Here's a question I need some help with... A point charge +Q has been placed between two infinitely large conducting plates. The charge induced on the surface of the first plate is q_{1}. What should be the charge induced on the surface of the second? (Diagram attached; the...
  41. B

    Help with polarization and half-wave plates

    I am taking a course in Electro-Optics for Electrical Engineering and I am having some problem solving the following question. Take two ideal polarizers (the first with its axis vertical and the second, horizontal) and insert between them a stack of 10 half-wave plates, the first with its...
  42. B

    Force between Conductor Plates

    How does one prove that the force between two conductor plates is F=q^2/2eA, where e=epsilon. If I use F=qE. Where the electric field is generated by one of the conducting plates: E=q/eA, then F=q^2/eA. I think what the answer assumes is that the E-field is from a uniform plate...
  43. P

    Finding Graphite Plates to Build a Fuel Cell

    How much are graphite plates? I need them to build my fuel cell.
  44. E

    Capacitance Across Not-So-Parallel Plates

    I'm trying to calculate the capacitance across a couple of parallel plates but, for fun, one of the plates looks like a stair step. So it has 2 sections facing one normal parallel plate at different distances. I see two possibilities here, one being that I can simply treat the two sections as...
  45. 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...
  46. 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...
  47. S

    What's your stance on Alma Mater Vanity Plates?

    I am curious as to your thoughts about people who post stickers on the back of their cars or change the license plate frame to announce to the world where they went to college. In some cases you can learn much of a stangers background as they have two or three and one specifies mba or JD or...
  48. J

    Thickness between glass plates

    Hi, I generally understand interference and Newton's ring/Young's double slit experiments, but I can't find the answer to a pretty simple question: When two glass plates are placed together and their is a gap of thickness "t", contructive and destructive interference leads to interference...
  49. G

    Speed of a particle that can pass through plates

    Two plates, potential difference V =1500 which are .012m apart. What speed particle can pass through them without being deflected?
  50. 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?
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