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

    Connecting Two Charged Capacitors

    Homework Statement Two capacitors C1 & C2 are independently charged to potentials V1 & V2. Then the two capacitors are connected to each other, where each positive plate is connected to the other's negative plate. What is the final charge on capacitor 1 in terms of C1, C2, V1, V2? Homework...
  2. N

    Electric field on two charged spheres

    Homework Statement Two tiny spheres of mass m = 7.90 mg carry charges of equal magnitude, 72.0 nC, but opposite sign. They are tied to the same ceiling hook by light strings of length 0.530 m. When a horizontal uniform electric field E that is directed to the left is turned on, the spheres hang...
  3. S

    Charged Particle Oscillating in External Constant Electric Field

    Homework Statement A mass m that has net electric charge Q is oscillating along the x-direction on one end of a spring (whose other end is anchored) of relaxed length s0. Suppose that someone then swirches on an electric field E  that is uniform in space, constant in time, and which points...
  4. K

    Uniform charged ball charge density problem

    A 20-cm radius ball is uniformly charged to 80 nC. (a) What is the ball’s charge density (C/m3)? (b) How much charge is enclosed by spheres at points 5, 10 and 20 cm from the center? (c) What is the electric field strength at points 5, 10 and 20 cm from the center? ATTEMPT: part a: i...
  5. J

    Charged capacitors in series and both ends of wire connected

    Two Capacitors are connected in series (3 microfarad and 6 microfarad) with Vab=10V. Battery is disconnected and the loose ends of wire are connected. What happens to the potential difference?Would it be zero..charge? I can't figure it out...sounds like a short circuit?
  6. M

    E & M, E-potential and energy due to charged plate/ rod with infinite length

    Homework Statement An infinite sheet of charge that has a surface charge density of 25.9 nC/ m2 lies in the yz plane, passes through the origin, and is at a potential of 1.32 kV at the point y = 0, z = 0. A long wire having a linear charge density of 81.1 nC/ m lies parallel to the y-axis...
  7. M

    Electric Potential due to a charged conductor(sphere within a sphere)

    Homework Statement Two concentric spherical conducting shells of radii a = 0.360 m and b = 0.540 m are connected by a thin wire, as shown in the figure below. http://capa.physics.mcmaster.ca/figures/sb/Graph25/sb-pic2550.png If a total charge Q = 10.6 µC is placed on the system, how much...
  8. M

    Electric Potential due to a charged conductor

    Homework Statement Two charged spherical conductors are connected by a long conducting wire, and a charge of 22.0 µC is placed on the combination. If the first sphere has a radius of 4.49 cm and the second has a radius of 5.68 cm, what is the electric field near the surface of each sphere...
  9. E

    Charged Sphere with off-center cavity Electric field

    Homework Statement Consider a sphere uniformly charged over volume, apart from a spherical off-center cavity. The charge density is ρ, radius of the sphere is a, radius of the cavity is b, and the distance between the centers is d, d < a-b. (a) Find the total charge and the dipole moment...
  10. E

    Charged Sphere with off-center cavity Electric field

    Homework Statement Consider a sphere uniformly charged over volume, apart from a spherical off-center cavity. The charge density is ρ, radius of the sphere is a, radius of the cavity is b, and the distance between the centers is d, d < a-b. (a) Find the total charge and the dipole moment...
  11. S

    Two charged beads and maximum velocity.

    I apologize for the brevity but the forums logged me out and ate my entire post. I just want to get the information written down this time. Homework Statement We have two charged beads, 12.0cm apart. What are their maximum velocities when released? Bead A: -5.0nC, 15.0g Bead B: -10.0nC...
  12. G

    Find potential difference of negative charged particle?

    Homework Statement The work done by an external force to move a -8.5μC charge from point A to point b is 15x10^-4 J. If the charge was started from rest and had 4.82x10^-4 J of kinetic energy when it reached point b, what must be the potential difference between a and b Homework Equations...
  13. C

    An experiment with a charged electrolyte and magnet

    Hi, I am a high school student and I'm planning on entering a regional science fair with an experiment involving electrolytes, magnets, and electric currents. However, I don't understand electromagnetism well enough to fully understand everything that would be going on in the experiment, and as...
  14. C

    Electric Field of a uniformly charged rod

    Homework Statement A uniformly charged rod of length L and total charge Q lies along the x-axis as shown. Find the components of the electric field at the point P on the y-axis a distance d from the origin. There's also a part b but I should be able to figure it out easily enough...
  15. F

    Electrostatics - Electron passing through charged plates

    Homework Statement http://img716.imageshack.us/img716/7692/picture8sj.png Homework Equations ΔEp=QV Ek=0.5mv2The Attempt at a Solution I'm making sure I understand what's going on here. Please bare with me. ΔEp = Ek .5mv2 = Q(1200+V) Solving for V, I get -642V. In a nutshell, is this what...
  16. H

    Initial acceleration of a charged particle

    Homework Statement If sphere 2 were free to move its initial acceleration would be ___m/s^2 Homework Equations Two small spheres carrying charges q1 = 7.68 µC and q2 = 5.74 µC are separated by 19.9 cm. The mass of sphere 1 is 10.5 g and the mass of sphere 2 is 15.2 g. The Attempt at...
  17. H

    Charged particle attatched to spring.Find the period of oscillation?

    Homework Statement A point particle of mass m carrying an electric charge q is attatched to a spring of stiffness constant k.A constant electric field E aong the direction of spring is switched on for a time interval T (T<<Sqrt(m/k)). Neglecting radiation loss,Find the amplitude of...
  18. G

    Energy of homogenously charged sphere

    hi i know that the energy of a conducting charged sphere is E=Q²/(8epsilon_0*pi*r) and i know how to calculate this. now i found that a homogenously charged sphere has E=3/5*Q^2/(epsilon_0*pi*r). does anybody have an idea how to calculate this? i don't know where this 3/5 come from?
  19. S

    Charged Teflon Rod & Aluminum (Conductor vs Insulator type question)

    Hello, Just wanted to check my some of my reasoning to these. If anyone could confirm if these answer I got are right (or point me in the right direction if they aren't!) I'd really appreciate that. Thanks! 1. Homework Statement (No Relevant Equations, real, & Attempts at Solutions are...
  20. A

    Calculate the field within a hole on a charged sphere

    Homework Statement If you have a uniformly-charged negative hollow sphere of charge, with a positive circular piece of charged shell superimposed on the outside, what is the electric field in the center of the circular piece? Also what part of the field going through the piece's center is...
  21. G

    Conservation of angular momentum - tetherball vs charged particle

    Hey all, I was wondering if one of you could help me out with a debacle I'm having. I'm having trouble reconciling what exactly happens between an orbiting tetherball and the separate scenario of a orbiting particulate charge. With the particulate charge: you can, given the velocity and...
  22. H

    Electric Potential Energy Question With two Similarly charged Objects

    Homework Statement Two frictionless pucks are placed on a level surface as shown, at an initial distance of 20m. Puck 1 has a mass of 0.8 kg and a charge of + 3x10^-4 while puck 2 has a mass of 0.4 kg and a charge of +3 x10^-4. The initial velocity of puck 1 is 12 m/s [E] and the...
  23. A

    Describe chemical compounds as CHARGED, POLAR or NONPOLAR

    Ok, I thought the only two options in existence were Polar and Non-polar... and I'm being asked which ones are CHARGED? What does this mean? Example: NH4+ (ammonium), NO3- (nitrate), N2, O2, H2O Thanks!
  24. E

    Effect of the magnetic field on a charged object's inertia.

    A question many of us repeatedly solved in high school goes like this: An electron is accellerated a certain distance by an electric field of a certain strength. Determine its final velocity. I and my teachers always treated this as a simple F=ma question, but recently it's occurred to me...
  25. K

    Force between 2 parallel, charged, conducting sheets.

    Homework Statement Two square parallel sheets with area>>distance between them have total charges of Q1 and Q2 on them. What is the force between them? Homework Equations Q1in+Q2in=0 Q1in+Q1out=Q1 Q2in+Q2out=Q2 Q1out=Q2out The Attempt at a Solution I set up 4 equations for the...
  26. S

    Energy Stored in a Charged Capacitor

    Homework Statement A 12.0-V battery is connected to a capacitor, resulting in 54.0 μC of charge stored on the capacitor. How much energy is stored in the capacitor? Homework Equations 1/2CV^2 The Attempt at a Solution At first this problem looks to be easy for me but somehow I...
  27. E

    Electric Field Magnitude at Point P Inside a Charged Sphere

    An insulating solid sphere of radius a = 1.2 m is uniformly charged with charge Q = 4.5 x 10^-6 C. Point P inside the sphere is at a distance r = 0.60 m from the sphere center C. What is the magnitude of the electric field at point P? So I'm using Gauss' Law: q,enc = Q[(pi * r^2)/ (pi *...
  28. Z

    FEM software? Poisson equation: Boundary conditions for a charged boundary

    Hi all, I want to calculate the electrostatic potential for an two-dimensional area with given Dirichlet boundary conditions (say, a square) with a charged ring in it (like a wedding ring, but inifinitely thin) with a given line charge density. I figured out that the problem should be...
  29. I

    Potential at the corner of a insulated charged cube

    Homework Statement An insulating cube of edge a has a uniform charge density p. The charge is zero everywhere outside the cube. The potential at an infinite distance from the cube is taken to be zero. If the potential at the center of the cube is Vo, find the potential at a corner of the cube...
  30. M

    Work done by an external force to move a charged particle

    Homework Statement A particle of (positive) charge Q is assumed to have a fixed position at P. A second particle of mass m and (negative) charge -q moves at constant speed in a circle of radius r1, centered at P. Derive an expression for the work W that must be done by an external agent on...
  31. C

    A charged particle in constant gravitational field

    In classical electrodynamics a paradox arises when we compare the power radiated by a charge falling under gravity using larmor formula (proportional to square of the acceleration, hence g^2) but the radiation reaction , given by abraham lorentz formula gives zero.(since it depends on the time...
  32. K

    How do I approach this Moving Charged Particle problem?

    Homework Statement The problem statement is attached. Homework Equations The Attempt at a Solution How do I start this problem?
  33. C

    Charged particle motion in a uniform magnetic field

    Consider that we have a macroscopic, electrically charged, point object tracing out a circular path in a uniform magnetic field in the usual way due to the Lorentz force. Now we very slowly raise the overall strength of the magnetic field (slow enough that on one orbit, the object sees the same...
  34. L

    Forces between charged particles, energy is coming from nowhere?

    So I've created a program in C# with the XNA libraries which is meant to simulate motion between charged particles. I drew a pic to show the problem I'm having and how I'm moving the particle.
  35. R

    Charged ball hanging from the side of charged cylinder, great complication.

    Homework Statement We have a charged ball with charge e and mass m hanging from the side of the charged cylinder with radius R and surface charge density of \sigma. The string to which the ball is attached is of length L Find a relation between charge e on the ball and the angle \varphi...
  36. B

    Charged ball hanging in equilibrium between two parallel plate capacitors.

    1. An experiment is run to determine the validity of numerous electrostatic principles. A small ball of mass 6.50 x 10-3 kg with a charge of ±1.50 μC is suspended from a non-conductive wire and hangs between two parallel plate capacitors. An angle of 30.0° is measured between the wire and the...
  37. J

    A charged wire exerts force on a proton.

    Homework Statement An electrically charged wire on the z axis exerts a force on a proton, which moves on the x axis. The initial conditions for the proton position and velocity are: x(0) = x0 and v(0) = 0. The force on the proton is Fx(x) = C /x where C = 3.2×10−15 Nm. (A) Determine the...
  38. B

    Charge Distribution Upon Contact: How Do Objects of Different Charges Interact?

    What happens when two objects of different charges come into contact? Do they distribute the charges per mass, volume, surface area or something else?
  39. Sigurdsson

    Mobility of charged particles in classical gas

    This is problem 9.2 in solid state physics by Ibach and Luth. Homework Statement Using the stationary Boltzmann equation, show that the mobility of the charged particles in a classical gas is given by \mu = \frac{e \langle v^2 \tau(\mathbf{k}) \rangle}{m \langle v^2 \rangle}...
  40. J

    A charged wire exerts a force on a proton.

    Homework Statement An electrically charged wire on the z axis exerts a force on a proton, which moves on the x axis. The initial conditions for the proton position and velocity are: x(0) = x0 and v(0) = 0. The force on the proton is Fx(x) = C /x where C = 3.2×10−15 Nm. (A) Determine...
  41. T

    Displacment equation of a charged particle

    In a case of a charged particle attracted to another fixed chrged particle both on one axis. force on charged particle will be F= (const)(q1*q2)/(r^2) for simplification = q1*q2*const =1 , and also mass of particle will be equal to one . so acceleration = 1/(r^2) r is distance between 2...
  42. E

    A circulating charged particle under a magnetic field

    http://imageshack.us/photo/my-images/543/unledyel.png/ This is a chamber, immersed in a magnetic field, containing circulating electrons shot into a gas. My question is: why is the direction of rotation for the electrons (as shown on the picture) clockwise and not counterclockwise? I am...
  43. A

    When can a charged sphere be treated as a point charge?

    Not much more to add to the title. I was just wondering, under what conditions can a charged sphere be treated as a point charge?
  44. D

    Electric field of a point outside a charged sphere

    If a conducting sphere has a negative net charge and there is a positive point charge at the center of the sphere, what charge would you use to find the Electric Field at a point outside the sphere? The equation is E=kq/r^2. Would I use the net charge of the sphere, or do I need to...
  45. V

    What happen when a plate of charged capacitor is earthed?

    Homework Statement A capacitor is charged with some potential difference. A charge will developed on both of it's plates. Now remove this capacitor from battery and ground/earth one of the plate through a wire. What will happen?? Homework Equations gauss law The Attempt at a Solution...
  46. S

    Motion of charged particle in magnetic field

    Greetings- I'm playing with the differential equations to get the standard or classical solution for the circular motion of a charged particle in a magnetic field. I have some question on my math. I'm doing this for fun - (just because) Should I post this in the homework section. Does...
  47. Y

    Charged cylinder with charge inside, find force

    Problem is: You have a non-uniformly charged solid cylinder along x-axis who's volume charge density (ρ=ρ°+vx), v is constant, changes according to where you are in reference to center of cylinder (origin). At center there is a charge q. Find force felt by the charge due to the cylinder. I know...
  48. T

    Electric Field of a Charged Ring

    Hi everyone, Homework Statement Let a charge Q be uniformly distributed on a circular ring defined by a < \rho < b. Find D at (0,0,h). Homework Equations E = kQ/r2 ar D = \epsilono E The Attempt at a Solution Well I thought I had this figured out, but I was wrong and I still...
  49. M

    Electric Force problem -> Infinite charged plane with hole

    Electric Force problem --> Infinite charged plane with hole The plane is infinite charged. It has a charge density (σ) of 10nC/m^{2}. If R=5cm, determine the electric force of a proton in the point P=(0,0,10cm). =====================================================================...
  50. A

    How Do You Analyze a Charged Shape Described by a Mathematical Function?

    The Image has all the details: http://img38.imageshack.us/img38/3448/question3p.jpg Uploaded with ImageShack.us I honestly I have no Idea as to where I should begin. Any hints on how to get started?
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