What is Charged: Definition and 1000 Discussions

In physics, a charged particle is a particle with an electric charge. It may be an ion, such as a molecule or atom with a surplus or deficit of electrons relative to protons. It can also be an electron or a proton, or another elementary particle, which are all believed to have the same charge (except antimatter). Another charged particle may be an atomic nucleus devoid of electrons, such as an alpha particle.
A plasma is a collection of charged particles, atomic nuclei and separated electrons, but can also be a gas containing a significant proportion of charged particles.

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  1. T

    Problem with solving laplace equation with a charged ring

    Homework Statement A ring charge of total charge Q and radius a is concentric with a grounded conducting sphere of radius b, b < a. Determine the potential everywhere. The ring is located in the equatorial plane, so both the sphere and the ring have their center at the same spot. Homework...
  2. LAByrinthAC

    Can Gauss's Law Derive the Electric Field Around a Uniformly Charged Ring?

    Hey guys can we derive the formula of Electric Field Intensity around a uniformly charged ring if yes please share the derivation thanks
  3. M

    Motion of a charged particle in an uniform electric field

    Homework Statement Imagine a particle with charge +Q moving with constant horizontal velocity passing perpendicular to electric field between two parallel plates. The length of the plates is L. Therefore, is the time spent in the field (well, between the plates), simply the length/horizontal...
  4. Jabbar

    Electric field due to a charged rod

    Homework Statement https://gyazo.com/d502fb408d6224ffa70700cf047bad20 (link to problem: #4). [moderator edit: Image inserted for clarity] A total charge Q is distributed uniformly over rod length L. The rod is aligned on the x-axis, with one end at the origin and the other at point x=L. a)...
  5. O

    Justification for 0 net E field within a charged shell

    SORRY TITLE SHOULD READ: "JUSTIFICATION FOR 0 NET E FIELD WITHIN A CHARGED SHELL" << Title fixed by Moderator (except for the all-caps of course) >> 1. Homework Statement A conceptual query: Considering an irregular shaped conducing shell with a net charge, using Gauss' Law, any Gaussian...
  6. J

    Decelerating charged particle and energy conservation

    Consider a charged particle moving with velocity v, having the energy 1/2 m v^2. Now we deccelerate the particle very quickly; so quickly that the radiated energy is greater than the kinetic energy (it can be arbitrarily large). Note also that energy obtained from decceleration is positive...
  7. B

    A charged particle entering a magnetic field at an angle -- is work done?

    Hello PF's members I know a magnetic field doesn't work on charged particles if magnetic field being perpendicular to the velocity of the particles. also i know magnetic field doesn't work if a charged particle enters with right angle into the field. But suppose that a charged particle like...
  8. T

    Electric field inside and outside a charged cylinder

    Homework Statement WITHOUT using Gauss's law calculate the electric field at all points outside and inside an infinite cylinder with circular cross section of radius b and charge density ρ Hint: Use cylindrical coordinates and place the target charge on the x axis..Homework Equations E =...
  9. B

    Position of a charged particle

    Homework Statement Two particles 1 and 2, each carrying 6.0 nC of charge, are located along an x axis, one particle atx=−30 mm and the other at x = 30 mm. Where along the y-axis is a particle 3 carrying a charge of +2.0 nC if it experiences an electric force of 6.9 × 10^−5 N ȷ^? Homework...
  10. Aldo Biko

    The force between charged and neutral object

    Homework Statement I did a lab involving Van de Graaff generator. Basically, below the charged sphere, I put a neutral sphere on a scale and measure the difference in mass which then I can calculate the force acting on the neutral sphere. I repeated the experiment with different distance. What...
  11. V

    A Transforming lepton basis to diagonlise charged lepton mass

    To determine the mass of charged leptons, we rotate such that the matrix of yukawa couplings (which gives the mass matrix after EWSB) is diagonal. We also call this flavour basis for neutrinos, because the flavoured neutrinos couple directly to the correspondong flavoured lepton in weak charged...
  12. 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?
  13. Milind Chakraborty

    A Charged Particle moving in Uniform Magnetic Field

    Homework Statement Problem given in the image attached. Uniform Magnetic Field : B Positive Charge : q Uniform Velocity : v Mass : m Charged particle enters the magnetic field making an angle θ with the plane perpendicular to the magnetic field. Width of the region of Magnetic field : d d <...
  14. Spinnor

    Pulling apart a charged capacitor and Poynting theorem.

    Suppose we have equal and opposite charge densities on a parallel plate capacitor. Let the plates be separated some small distance d (small when compared with the plate size). Now slowly separate the plates so that their separation is now doubled to 2d. We have done work and the electrostatic...
  15. dumbdumNotSmart

    Electric Field in a cavity of a charged sphere

    NOTE: Other threads suggest solving it with Gauss' Law. I'd like to see an approach through direct integration, no full followthrough necessary.. 1. Homework Statement Consider a sphere with a uniform distribution of charge ρ (ro). Inside the sphere is a cavity (spherical). Calculate the...
  16. Sophrosyne

    I Wavelength of photons exchanged between charged particles

    When two electrons approach each other, there is a repulsion between them by the exchange of a photon as the electromagnetic force carrier. Is there a general range of wavelength of such photons? Does it depend on how rapidly these electrons are approaching each other?
  17. J

    Infinitely charged wire and moving charge

    Homework Statement There's a uniform infinite line charge with the charge density λ. A point particle with charge q moves with a velocity v parellel to infinite line. What is force exerted on point particle? What is magnetic field seen in ths moving frame(particle frame)? Homework Equations...
  18. D

    Scattering of two charged particles

    Homework Statement Two identical charged particles, each of mass m and charge e, are intitialy far apart. One of the particles is at rest at the origin, and the other approaching it with velocity v along the line x=b, y=0 where b=e^2/2 \pi \epsilon_0 mv^2. Find the scattering angle in the CM...
  19. Ankit Chowdhury

    Question from Electrostatics -- Charged beads on a wire....

    Homework Statement On a long friction-less non-conducting straight needle are threaded an infinitely large number of identical beads.The beads are made of insulating materials and have charges of equal magnitude and alternate plus and minus signs.Assume charge distribution on a bead unaffected...
  20. Clara Chung

    Calculating Electron Speed Between Parallel Charged Plates

    Homework Statement An electron is emitted by an electron gun which is midway between two parallel charged plates which are 20 cm apart. The electrical field strength between the plates is20 N C^-1. The electron is attracted towards the positive plate and strikes the plate as shown. If the...
  21. Spinnor

    B Energy Stored in Charged Capacitor: Kaluza-Klein Theory

    In terms of Kaluza-Klein theory how does one view the stored electromagnetic energy between the plates of a charged capacitor. Thanks!
  22. Spinnor

    B Energy density of charged capacitor via QFT

    From the view point of quantum field theory how does one describe the electromagnetic energy density between the plates of a charged capacitor? Thanks!
  23. F

    Electric Potential of charged isolated body.

    Homework Statement Two equal isolated metallic bodies A & B start with no charge and zero potential. A is given a charge giving B the potential U. B is then Grounded giving A the potential U. What potential did A have before B was grounded? Hint: Use symmetry and use potential coefficients...
  24. 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 -...
  25. Safinaz

    I LHC searchs for charged Higgs scalars

    Hi all, I'd like to know what is the most recent exclusion bounds on the mass of new charged Higgs scalar according to CMS and ATLAS collaborations searches at CERN ..
  26. AndresPB

    Why is Bremstrahlung or K-shell emission necessary in an x-ray machine?

    Good morning all, I was just wondering the following question. When an electron is accelerated it emits electromagnetic radiation, depending on how much it is accelerated the energy varies so the frecuency does and the electromagnetic wave emitted would be of different colors or maybe even...
  27. DuckAmuck

    I Black Holes and Charged Particles

    What happens when charged particles fall into a black hole? Say like N electrons fall in, giving the black hole a net charge of -N. Since light cannot escape the event horizon, I imagine electric fields cannot either, since they are mediated by photons. So is that charge effectively lost until...
  28. K

    A Charged black holes and charge balance in galaxies

    Greetings, There seems to be a supposition in astronomy that charged black holes are uncommon. Is this assertion well supported? According to a paper I found by Briet and Hobill, if you look at gravitational lensing alone charged black holes look just like regular black holes, but with a mass...
  29. V

    Potential of charged and uncharged conductor

    Homework Statement Homework EquationsThe Attempt at a SolutionAssuming zero of the potential is at infinity , the potential refers to the potential difference between the each conductor and infinity . The potential of the uncharged conductor would be due to three charges, positive induced...
  30. W

    Electric field due to a charged square

    Homework Statement there is a square on the XoY plane, centered at the origin (just outlines of the square) it has a charge Q (Q>0) and side 2L, i must evaluate the electric field along the z axis. see attached image Homework Equations E=k*q/r^2 The Attempt at a Solution So first i divided...
  31. 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...
  32. P

    Charged particle in centre of equilateral triangle

    Homework Statement 3 charged particles located at equilateral triangles corners has charge ##q_1=q_2=q_2=4*10^{-6} C ## The 4th particle with charge ## q_4=3*10^{-4}## is placed at bisectors crossing. The distance between q1 and q4 is 3.46 cm .What is the net force on q4? Homework Equations...
  33. D

    Why won't a magnet exert a force on a stationary charged particle

    Why is it that a static electric field will exert a force on a stationary charged particle but a magnetic field from a permanent magnet will not? I am somewhat confused by this because the magnetic field in a permanent magnet is the result of spin charge polarisation which must generate closed...
  34. Salvador

    Charged particles through various B field shapes quesion

    Hi, first of all I wan to ask a few simple questions , when we move a piece of wire perpendicular to a uniform magnetic field like between the faces of two magnets facing N-S we get a current either one or the other way in the wire , yet when we would shoot an electron beam the same path as the...
  35. V

    Charged particle in Electric and Magnetic field

    Homework Statement A particle of specific charge q/m is projected from the origin of coordinates with initial velocity ##v_1\hat{i}+v_2\hat{j}## in space having uniform electric field and magnetic field as ##-E\hat{j}## and ##-B\hat{j}## respectively. The particle will definitely return to the...
  36. A

    When a charged object is brought close to an uncharged one (attraction)

    I have always been told that a charged object will attract an uncharged on when brought close (but do not touch) the uncharged object. However, wouldn't this depend on whether the uncharged object is an insulator or an conductor? This is my reasoning, but I am not sure if it is correct: When...
  37. D

    I Uncharged Particle near Charged Mass

    I know that the curvature of space-time around an uncharged mass is different from that around a charged mass (specifically, one situation is characterized by the Schwarzschild metric and the other by the Reissner-Nordstorm metric). But consider an uncharged particle in each situation. Wouldn't...
  38. 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...
  39. D

    Magnetic field on charged cloud

    An electron beam can be curved into a loop using a magnetic field with flux lines at right angles to the electron beam. These electrons have a high kinetic energy leaving the electron gun. My question is how would a magnetic field effect motionless charged particles for example a cloud of...
  40. A

    Speed of charged particle moving in E and B fields

    [moderator note: Thread title changed to make it descriptivie of the problem] Homework Statement A particle having mass m and charge q is released at the origin in a region in which magnetic field and electric field are given by B= -B' j and E= E' k where j and k are unit vectors along y-axis...
  41. JulienB

    Maximal repellence between charged spheres

    Homework Statement Hi everybody! I just started electromagnetism, and I'd like to make sure I get the concepts correctly before going further. I got this homework: A charge is shared between two spheres. How big must the share of charge relative to one another be, so that there is the maximal...
  42. D

    Electric field due to a charged sheet

    When a plane sheet is given a charge Q the electric field at any point around it is given as ##E = \frac{\sigma}{\epsilon_0}##. Thus mathematically it can be concluded that the electric field is constant everywhere and is independent of distance of the point from the sheet. But what logical...
  43. U

    Electric charges and fields: Charged conducting spheres touching then separated

    Homework Statement Two charged metallic spheres of same size repel each other by a force F. They are now touched with each other and are then separated to same initial distance. Now the force of repulsion is F'.Homework Equations On touching the spheres will reduce their charges... So the new...
  44. Khaled Yasein

    Electrostatic potential of a charged disk

    How can I find the electrostatic potential of any point on a charged disk with radius R and surface charge density σ
  45. S

    Electric Field along bisector of charged line (w/error)

    Homework Statement You wish to determine the electric field magnitude along the perpendicular bisector of a 230-mm line along which35 nC of charge is distributed uniformly. You want to get by with a minimal amount of work, so you need to know when it is sufficient to approximate the line of...
  46. T

    A Charged Conductive Plate with a Charged Plane

    Homework Statement In the "Before" scenario, there is conductive plate in electrostatic equilibrium with uniform surface charge density +η (the plate has some thickness but the width and length are significantly larger). In the "After" scenario, an infinite plane of negative charge with fixed...
  47. K

    Charged particles moving through a magnetic field

    Homework Statement A collection of charged particles move through a magnetic field at an angle to the field lines. Calculate the velocity of the particle if it is an electron moving at 30 degrees to the magnetic field of strength 3.4mT, causing it to experience a force of 4.7x106-18N Homework...
  48. S

    A few questions about charged particles

    I understand the basic forces moving charges experience in magnetic fields. I dont; however, understand how these these charges would interact with particles uninfluenced by the magnetic field. 1. If a charged particle is moving perpendicular to a uniform magnetic field, it will follow a...
  49. Titan97

    Uncharged capacitor connected to a charged capacitor

    Homework Statement An uncharged capacitor is connected to a charged capacitor as shown: The ends are left as it is. Will the charges redistibute? Homework Equations None The Attempt at a Solution I think it won't. Let the first capacitor be charged with charge Q. Before closing the switch...
  50. A

    Heat energy from a charged configuration

    Homework Statement [/B] I have two spherical metallic shells with radius ##3a## and ##a##, the little one is placed inside the larger so that the center of the little one is at a distance of ##a## from the center of the larger. The outer one has a charge ##3Q## and the one inside has a charge...
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