Charged Definition and 1000 Threads

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. W

    Electrostatics: "Compressing" Charged Spherical Shell

    Homework Statement How much work is required to squeeze a uniformly charged spherical shell from a radius of ##r## to a radius of ##r−dr##, if (a) the total charge q is a constant, (b) the sphere is kept at a constant potential, e.g. grounded. (c) Are the answers the same or different...
  2. D

    I Charged black hole - static electric field lines

    Where do the static electric field lines appear to originate from a charged black hole, non rotating, Reissner–Nordström metric? I've had a number of qualified physicists say they appear to come from the center of the black hole, but people on these forums have said that doesn't make sense...
  3. Matt Chu

    Potential Energies of Two Charged Cylinders

    Homework Statement Problem 1.24 (this is unimportant; it's just a different way of calculating the potential energy of a solid cylinder) gives one way of calculating the energy per unit length stored in a solid cylinder with radius a and uniform volume charge density ##\rho##. Calculate the...
  4. Brystephor

    Electric field magnitude between two charged disks problem

    Homework Statement Consider two thin disks, of negligible thickness, of radius R oriented perpendicular to the x axis such that the x axis runs through the center of each disk. (Figure 1) The disk centered at x=0 has positive charge density η, and the disk centered at x=a has negative charge...
  5. klm_spitifre

    Electrical field near infinite, charged rod

    Homework Statement Calculate the electric field at point ##P## if the distance from the center of an infinitely long, charged rod to point ##P## is ##a = 0.6m##; the charge density equals ##\lambda = -CX^2##, ##C=10^{-3}C/m^3##. Show all steps in finding the equation of the field, then find the...
  6. Likith D

    Gauss' law for uniformly charged space

    the problem: Say we have the entire space uniformly charged. Then, the E field experienced by any point is zero, from symmetry.* But, it means that for any Gaussian surface, the flux though it is zero even though the charge enclosed is clearly not. Gauss' law seems to disagree with symmetry, but...
  7. Q

    How do I calculate the force between a charged and a neutral sphere

    Homework Statement Two otherwise identical, small conducting spheres have charges +6.0 µC and −2.0 µC. When placed a distance r apart, each experiences an attractive force of 9.1 N. The spheres are then touched together and moved back to a distance r apart. Find the magnitude of the new force...
  8. slow

    Asymmetrically charged capacitor

    Hi. I put the simplest case. A capacitor formed by two flat metal plates faced in the vacuum, with charges of the same absolute value in both plates. In this case, the electric field of the capacitor, in a static situation, has an energy expressed in the following way. E=\dfrac{q^2}{2 \ C} Now...
  9. ubergewehr273

    Why do charged capacitors prevent current flow?

    It is given that an uncharged capacitor is connected with a battery. Clearly, it gets quickly charged and flow of current stops in the circuit. What is the reason behind a charged capacitor in completely restricting the flow of current ?
  10. nagyn

    Spin of a charged sphere in a non-uniform magnetic field

    Homework Statement Consider a solid spinning sphere of negative charge in a non-uniform magnetic field: http://d2vlcm61l7u1fs.cloudfront.net/media%2F2f8%2F2f840122-3d7f-4af3-98a7-efa9b2e7d26a%2FphpBOhfaK.png (the rotation illustrated at the top is supposed to be counter-clockwise). What...
  11. F

    Which creates an electric field -- charge or a charged particle?

    wich creates an electric field charge or a charged particle (electron)
  12. D

    Intro Physics Photon and charged particle interactions with matter

    I am about to teach some of an introductory course for bachelor students in the field of medical physics. More specifically the topic "Photon and charged particle interactions with matter" in respect to radiation therapy (again, medical physics). I know there are a lot of topics within radiation...
  13. Pushoam

    V(center) of charged metal sphere inside a grounded shell

    Homework Statement Homework EquationsThe Attempt at a Solution Potential at the center of conducting charged sphere surrounded by a grounded shell If I take another sphere of charge –q of radius a with uniform charge density, then the potential on the spherical region from the radius a to...
  14. C

    Can charged baryons flow induce magnetic field?

    We all think that electric current is the electrons flow without mass transfer in conductor, i.e. charged lepton flow. But charged baryons flow can also deemed as "electric" current, e.g. ionic current. My question is that charged baryons flow can induce magnetic field? Same amperes, then same B...
  15. Curtis Cleary

    Find the coordinates of a charged particle given the E field

    Homework Statement The electric field in an xy plane produced by a positively chatged particle is 7.2(4x+3y)N/C at the point (3, 3)cm and 100x N/C at the poiint (2, 0)cm. Note, x and y used here are unit vectors. find the x and y co-ordinate of the charged particle what is the charge of the...
  16. Const@ntine

    Gauss' Law: Charged Rod & Sphere (Electric Flux)

    Homework Statement A charged, straight line/rod of infinite length has a Discrete uniform distribution of charge, has a linear density of λ and is at a distance d from a sphere with a radius of R. Find the entirety of the Electrical Flux that is caused by this charged rod, which passes...
  17. E

    Connecting two charged capacitors

    Homework Statement One capacitor with a capacity of 6μF and another with a capacity of 12μF are charged by being connected in a series to a voltage source with an electrive force of 660V. After that, we disconnect the capacitors from the source and connect them to each other. What is the charge...
  18. V

    A Light polarization in charged exciton in Voigt configuration

    Dear all, I'm studying a charged exciton system, composed by two ground states (electron spin up 1/2 and down state -1/2) and the two heavy hole trion state (up 3/2 and down -3/2). In this case the light which couples two ground states and the trion state has right/left polarization, to...
  19. G

    Thermal radiation and charged particle acceleration

    A non ionized neutral gas should still emit thermal radiation.,say xenon. Is this solely because of electron transitions ? I ask this because a lot of sources attribute the emission to charge particle acceleration,so neutral atoms should not do this,is this right?
  20. N

    I Magnetic moment of a massless charged Fermion?

    The spin magnetic moment of a charged, spin-1/2 particle is $$g \frac e {2m} \frac \hbar 2$$ where g is the g-factor (2 for any particle in tree-level approximation, 2.00231930436182 for electron), e is charge m is mass ##\frac \hbar 2## is spin But with zero mass this expression does not make...
  21. C

    Collision of two charged particles projeced in magnetic field

    Homework Statement Two particles having mass m separated by a distance d is uniform magnetic field as shown in the figure . If v=qBd/m, at what instant does collision occur. The coulomb force between the particles is switched off. Homework Equations T=2πm/qB The Attempt at a Solution For the...
  22. C

    Force between two charged particle beams -- proton and electron beams

    Homework Statement A proton beam is going from north to south and an electron beam is going from south to north, so in which direction is the electron beam deflected Homework EquationsThe Attempt at a Solution . [/B] I thought an electron...
  23. J

    Charged particle in a magnetic field

    Homework Statement Homework EquationsThe Attempt at a Solution Velocity of particle at any time t is v = vxi + vyj Net Force on the particle F = (2qvyB)i + (2qvxB)j Net acceleration of the particle = F/m Magnitude of net acceleration = (2qvB)/m Particle has an initial velocity as well...
  24. N

    Did I Make Mistakes in Calculating the Potential of a Charged Sphere?

    Homework Statement A sphere of radius R has a volume charge density proportional to distance from center. Total charge contained in the sphere is Q. If electric potential at infinity is taken to be zero , potential at it's center is Homework Equations Here given are ρ= βr where β is a constant...
  25. astrocytosis

    Radial force on charged particle in beam of positive ions

    Homework Statement Many experiments in physics call for a beam of charged particles. The stability and “optics” of charged-particle beams are influenced by the electric and magnetic forces that the individual charged particles in the beam exert on one another. Consider a beam of positively...
  26. D

    Magnetic Force direction on a charged particle moving parallel to a wire

    Homework Statement Homework Equations The right hand curl rule gave me the counterclockwise direction for the magnetic field but I am confused about how is it going to work for the particle. Thanks The Attempt at a Solution
  27. D

    Magnitude of the Electric Field at the Following Distances

    Homework Statement The figure below shows a spherical shell with uniform volume charge density ρ = 1.87 nC/m3, inner radius a = 15.0 cm, and outer radius b = 2.60a. [Reference Picture] What is the magnitude of the electric field at the following radial distances? Homework Equations...
  28. A

    Potential on the axis of a uniformly charged cylinder

    Homework Statement Posting here because it was over a previous homework assignment and I don't understand the solution that was given out. For reference, the problem is 2.27 is Griffiths' Introduction to Electrodynamics. It reads "Find the potential on the axis of a uniformly charged solid...
  29. R

    Electric potential due to collection of charged particles

    Homework Statement A particle with charge q1 = -6.75x10^-6 is located at (0,3.25x10^-2 m ) and a second particle with charge 3.2x10^-6 is located at (0,-2.75x10^-2 m) what is the electric potential due to the two charges at the origin? Homework Equations V = kq/r The Attempt at a Solution So...
  30. A

    Solving the Charged Bubble Problem with Gas and Electrostatic Forces

    1. 2. The force due to gas pressure = p(V0/V) dA The force due to atmospheric pressure = p dA The force due to electrostatic repulsion = undetermined 3. Though I don't surely know what the expression for electric force should be, I took an educated guess and solved using the relation...
  31. T

    Period of three oscillating charged coins

    Homework Statement Homework Equations ## u = 1/2 a x^2\\ ke = 1/2 b {\dot x }^2\\ then\\ \omega = \sqrt{\frac{a}{b}} ## The Attempt at a Solution ## U = \frac{2 k q ^2}{l} + \frac{k q^2}{2 l cos \frac {\theta}{2}} ## from that it is easily seen that equilibrium position is when the...
  32. M

    Y coordinate of a charged particle

    Homework Statement On the diagram, a charged particle of charge 0.000003 C and mass 0.000007 kg moves across the electric field 6760 V/m with initial speed 40 m/s. When its x coordinate is 93.3 cm, its y coordinate is (in cm)? Homework Equations y=(e*Em*x^2)/(2*m*v^2), where Em is electric...
  33. DaTario

    Why a pulsating charged sphere does not emit radiation?

    Hi All, Consider an elastic sphere which is homogeneously charged and suferring an harmonic inflation and deflation. Is it correct to explain the theoretical result that it does not emmit radiation, even though all of its charge elements are accelerating, as a systematic effect of destructive...
  34. yrjosmiel

    Magnetic field of a single charged particle

    Let's say that there's nothing else in this universe except for 2 charged particles: q1 and q2. q1 is moving relative to q2, moving at velocity v. I've read that a magnetic field is made by a moving charge. In this case, the moving charge q1 is moving relative to q2. What would the magnetic...
  35. R

    Simple Electric field question -- Charged sphere

    Homework Statement A sphere with a charge of -3.5 x 10^-9 C and a radius of 1.0x10^-2 m is located at the origin of a coordinate system. What is the electric field 1.75 x 10^-2 m away from the center of the sphere along the positive y axis? Homework Equations e = kQ/r^2 The Attempt at a...
  36. J

    Moment of inertia of a charged spinning top

    How can I calculate the moment of inertia of a spinning top with charge Q submerged in an electromagnetic field? I've already calculated it for the case with no charge, but I don't know how to do this.
  37. soothsayer

    Force between similarly charged plates

    In a setup I am designing, I have two conducting plates of similar charge, separated by 1mm of vacuum. The "top" plate, which is mechanically fixed, is charged to -10kV. The other "bottom" plate, which is electrically isolated, but not mechanically fixed (can move toward the "top plate"), is...
  38. V

    Force due to two thin charged rods acting on each other

    Homework Statement I have 2 thin rods of length L in the axial plane(x axis), they're of the same uniform linear charge distribution and are separated by a distance a . Homework Equations $$E = \frac{kq} {R^2}$$ $$F = qE$$ The Attempt at a Solution [/B] Let 0 be one at one end of the two rod...
  39. L

    Capacitors charged in parallel

    Homework Statement Capacitors C1 = 6.97 uF and C2 = 1.54 uF are charged as a parallel combination across a 281 V battery. The capacitors are disconnected from the battery and from each other. They are then connected positive plate to negative plate and negative plate to positive plate. A)...
  40. Z

    Angle between 2 charged spheres hanging from string

    Homework Statement Two positively charged metal spheres are suspended from the same hook by light strings of equal length, making an angle of 10.0◦ with each other. The charges carried by the spheres are as shown in the diagram. After that, the spheres are brought in contact briefly, then...
  41. R

    When a current is passed through a conductor, will it be charged?

    Please explain me the following answer Q)When a current is passed through a conductor, will it be charged? A)Charge carriers participating in conduction in a conductor are not excess charge carriers. The number of free charge carriers is equal to the number of opposite charge on the nearly...
  42. C

    Motion of Charged Particles in Electric Fields

    Homework Statement This is the question: An electron at rest of mass 9.11 × 10−31 kg is accelerated through a potential difference of 350 V. It then enters some deflecting plates of 50 V with dimensions as shown. Calculate the distance x (deflection of the electron) (Charge on an electron is...
  43. C

    Electric field strength between charged plates help

    Homework Statement Homework EquationsThe Attempt at a Solution E=kq/d2 how do I involve the kinetic energy K in the equation?
  44. V

    Energy change for a charged particle

    Homework Statement Without introducing any coordinates or basis vectors, show that, when a charged particle interacts with electric and magnetic fields, its energy changes at a rate $$\frac{dE}{dt}=\vec{v}\cdot \vec{E} $$ Homework Equations ##E_{kin} + E_{pot}= En =## const (1)...
  45. C

    Electric field strength between charged plates

    Homework Statement Homework EquationsThe Attempt at a Solution E=kq/r2 so when the distance increase E should decrease? I know this is wrong, but can someone explain why? Thanks
  46. C

    Charged insulator touches a conductor

    Ques : If a neutral metal sphere placed on an insulating stand is touched by a charged plastic rod , does the metal sphere acquire any charge ? I think that by simply touching the sphere by insulating rod , the metal should not acquire any charge as the charges on the rod are immobile unlike a...
  47. P

    Charged sphere and charged conducting shell

    Homework Statement A + q = 5 pC charge is uniformly distributed on a non-conducting sphere of radius a= 5 cm , which is placed in the center of a spherical conducting shell of inner radius b = 10 cm and outer radius c = 12 cm. The outer conducting shell is charged with a -q charge. Determine...
  48. anorlunda

    I Merging Charged BHs: Is A's Observation Continuous or Discontinuous?

    An earlier thread inspired me to imagine the following scenario. Consider observer A, black hole B and black hole C. A's past and future remains far enough away from any EH so that A is classical. In the past, A and B were stationary relative to each other. C approaches from infinity on a...
  49. Spinnor

    Charged basketball, inertia ball and field

    I was wondering how much I would have to charge a basket ball of mass M, so that I would begin to feel the inertia of the electrostatic field energy. We can calculate the total electrostatic field energy surrounding the charged basket ball, call it E. Can we then equate this energy E with a mass...
  50. R

    Electric Field of a Charged Sphere?

    Homework Statement A sphere of radius R has total charge Q. The volume charge density (C/m^3) within the sphere is ρ = ρ_0 (1 - r/R). This charge density decreases linearly from ρ_0 at the center to zero at the edge of sphere. a. Show that ρ_0 = 3Q/πR^3. b. Show that the electric field inside...
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