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. F

    Deriving E of a charged spherical shell from V

    Wrote my question up in Latex Update: I have corrected the mistake when I stated the "textbook" version of the equation that the problem requires to be used. I have reposted the pdf with the same name.
  2. B

    Charged particle entering velocity selector

    [b]1. The problem A velocity selector consists of a parallel plate capacitor placed in an outside magnetic field (see figure). Charged particles entering the velocity selector experience an electric and a magnetic force (neglect effects due to gravity). Given is the setup in the figure below...
  3. L

    Charged straight wire Electrostatics

    Homework Statement We have a charged straight wire with radius ra = 0.2 cm and with charge ta = 3nanoC/m. Around the wire there are two hollow concentric cylinders, so that the wire is in their axis. Let the charge on the first cylinder be of radius rb = 3cm and its charge tb = -1.5nC/m and on...
  4. M

    Is the intersteller medium a charged gas or a plasma?

    Hello Physics Forums! I've been educating myself on electrostatics, electronics, and electromagnetics and I have come to the topic of plasmas. I understand that plasmas are essentially charged gases - but their behavior is so disparate from regular gases that they are classified as the fourth...
  5. R

    Electric field lines produced by two eccentric charged cylinders

    Homework Statement This is the theory for a laboratory session. If we have two hollow cylinders, one with radius r1 and the other with radius r7, the center of the first one being placed at a distance d from the center of the second one, what are the surfaces having the same electric...
  6. T

    Cycloidal Path of Charged Particle

    Homework Statement A charged particle (q), mass (m) is released from a frictionless inclined plane of angle θ under influence of Earth's acceleration (g) and magnetic field (B) perpendicular to (g) and plane of motion of particle. The particle slides down distance "l" along incline and then...
  7. H

    Electric Field and charged plane

    Homework Statement An infinite, charged plane/plate has a uniform positive charge density of σ. Another positively charged particle is found at a distant of D from the plane. In point P, positioned between the two, the electric field equals 0. A. What is the distance between point P and...
  8. sa1988

    Magnitude of electric field between two concentric oppositely charged

    Homework Statement Magnitude of electric field between two concentric oppositely charged spheres. Homework Equations The Attempt at a Solution So I first went with the simple electric field equation E=V/d So I have the potential difference V between the two sphere...
  9. R

    Electric field and the charged conductor.

    It is well known that under electrostatic conditions, a neutral conductor when placed in an external electric field encloses a net zero electric field within it. But, do you think that the electric field within a charged conductor is zero, when it is placed in an external electric field...
  10. L

    Charged ring, integrate for electric potential

    Homework Statement A flat ring of inner radius R1 and outer radius R2 carries a uniform surface charge density σ. Determine the electric potential at points along the axis (the x axis). [Hint: Try substituting variables.] Homework Equations V = (kQ)/r The Attempt at a Solution...
  11. A

    Can a CHANGING magnetic field change the speed of a charged particle

    We had this ques. in a test - "can a changing magnetic field change the speed of a charged particle". The ans given to us was "no because it's velocity is perpendicular to the magnetic force due to the mag field" but a friend of mine wrote that a changing mag. field will induce an emf which...
  12. J

    Measuring time delay before charged plates repel

    Imagine two parallel conducting plates set at a distance of several meters. If one charges the two plates simultaneously then one would expect a small delay before they started repelling each other due to the time it takes changes in the static field to propagate from one plate to the other...
  13. R

    Electric field inside a charged conductor placed in free space.

    It is true that under ELECTROSTATIC CONDITIONS, excess charge on a conductor always resides on the surface of the conductor because if they were inside it, there would be an electric field inside the conductor which would set the free electrons into motion. They distribute uniformly over the...
  14. B

    Line Image of a Charged Cylinder

    Homework Statement A long conducting cylinder bearing a charge \lambda per unit length is oriented parallel to a grounded conducting plane of infinite extent. The axis of the cylinder is at distance x_0 from the plane, and the radius of the cylinder is a . Find the location of the line...
  15. X

    Why do positive and negative charges repel each other?

    Can anyone explain this excerpt to me? I'm lost on how the positive and negative charges push each other away instead of attract. Thanks! P.s I think this goes in this forum.
  16. M

    Electric Field due to a charged line; With y as function of theta

    Well the main problem here its once a i get the integral i do not how to put dy as function of thetha and then integrate ; at the end that's what i get Ex=integral (dE*cos\theta)=(\lambda/4\pi\epsilon) times the integral of cos(\theta)dy/x^2+y^2 where i can easily find the cosine and...
  17. B

    Force on Electron Due to Two Charged Objects in an Electric Field

    Homework Statement Two charged objects are separated by a distance of L=0.4650 m as shown in the diagram. Object Q1 has a charge of +5.250 nC. Object Q2 has a charge of +2.960 nC. A) What is the magnitude and direction of the electric field at Point A, which is located a distance...
  18. Xeroxer

    A Charged Sheet Between Grounded Plates

    Homework Statement Two infinite conducting planes are held at zero potential at z=-d and z=d. An infinite sheet with uniform charge per unit area σ is interposed between them at an arbitrary point. a) Find the charge density induced on each grounded plane and the potential at the position of...
  19. D

    Why must a charged particle be accelerated to produced photons?

    Suppose you have an electron moving at constant velocity. This new area that it is moving into initially had 0 electric flux through it but now that the electron moves to that location the electric flux is changing which in turn cause a magnetic flux ad infinitum. So why must a charge be...
  20. vanhees71

    Massless charged particle in electrostatic field

    Does anyone here know a source, where the equation of motion for a massless charged particle (which of course does not exist in Nature as far as we know) in a homogeneous electric field is actually solved? I googled, and there are some papers about this, but the equations are never actually...
  21. A

    Finding the distance traveled by a charged object

    There are two electrically charged objects that are placed 6 cm away from each other. Each object has an electrical charge of +1 microColoumbs and a mass of 1 milligram. If one object is fixed in place, how far does the other go in 2 milliseconds? So I'm given the charge, distance between the...
  22. L

    Question about the E-field along center axis of charged ring

    http://www.physics.udel.edu/~watson/phys208/exercises/kevan/efield1.html I'm having trouble understanding the derivative notation. I know that "dE" and dQ" have to do with the derivative, but what exactly does that mean in the context of this problem? For some reason I find it difficult to...
  23. B

    Two suspended charged particles, find the angle from vertical.

    Homework Statement Two particles, each of mass m and having charge q, are suspended by strings of length l from a common point. Find the angle θ which each string makes with the vertical. Homework Equations F_e = k \frac{q^2}{r^2}, \quad F_G = -mg, \quad F_T = \text{tension on string}...
  24. B

    Charge & Energy Stored in Charged Capacitor (14V, 113pF)

    Homework Statement A voltage of 14 V is placed on a capacitor with C = 113 pF (picofarads). (a) What is the charge on the capacitor? (b) How much energy is stored in the capacitor? I believe I have the correct equation but I'm not sure about the final answer because of the picofarads...
  25. Sneakatone

    Line Charge and Charged Cylindrical Shell (Gauss law)

    Homework Statement An infinite line of charge with linear density λ1 = 6.2 μC/m is positioned along the axis of a thick insulating shell of inner radius a = 2.7 cm and outer radius b = 4.4 cm. The insulating shell is uniformly charged with a volume density of ρ = -552 μC/m3.1) What is λ2, the...
  26. K

    Does metal powder in water disperse when water is being charged?

    Does metal powder in water disperse when water is being electrically charged? I think that it might not disperse since water is also charged, the repulsion of water molecule will force it back making net repulsion equal to zero. Am I correct? Thanks for answering. Here is the diagram that I...
  27. A

    The force between charged parallel disks, when distance isn't given?

    Two circular disks, each of area 2.10×10-4 m2, are situated parallel to one another. The distance between them is small compared with their radii. Both disks are uniformly charged; their charges per unit area are σ = 5.10×10-5 C/m2 for one and -σ = -5.10×10-5 C/m2 for the other. Compute the...
  28. A

    Voltage on a electrostatic charged sphere

    I understand that voltage depends on how far the electrons are, so for a sphere it would be q*k / r. But what if a sphere with 100kv , then we put with contact to it a metal box , becoming on body, will the volt remain 100kv
  29. H

    Charged sphere hanging from a string-Find the charge?

    Charged sphere hanging from a string--Find the charge? A small, plastic sphere of mass m = 126 g is attached to a string as shown in the figure. There is an electric field of 151 N/C directed along the + x axis. If the string makes an angle 30 degrees with the y-axis when the sphere is in...
  30. C

    Find Electric Field Magnitude at Center of Charged Semi-Circle

    Homework Statement Positive charge Q is uniformly distributed around a semicircle of radius a. Find the magnitude of the electric field at the center of curvature P. Express your answer in terms of the given quantities and appropriate constants. Homework Equations The Attempt...
  31. Y

    Charged conductor in electrostatic equilibrium

    I have read that in electrostatic equilibrium, their are no electric fields or else the charges would be moving. So given a positively charged spherical shell, the positive charges would repel each other and reside on the outside, causing the shell to be in electrostatic equilibrium. But if...
  32. D

    Charged particle final position equation

    Hello all, I am new to PF; this is my first post. I am currently taking a physics class on electricity and magnetism. I am trying to find an equation to calculate the final position of a charged particle p, given that there are n other particles. Known: + initial (positions and...
  33. H

    Electric field inside a charged sphere

    If we have a uniformly charged spherical shell, supposing that the shell is non-conducting, could we have any electric field inside the sphere? Why?
  34. cactusblanket

    Acceleration of a Charged Particle in 3D Vector Notation

    Homework Statement Hi there! Here is a problem from our 1st year course. We have covered the basics on charges and Coulomb's Law. However our prof said he designed the following question to be "deliberately obscure"! Two charges of 4.00μC are fixed in space, Q1 at (0,0,0) and Q2 at...
  35. Ascendant78

    Finding the electric field of a charged rod

    Homework Statement Homework Equations See above The Attempt at a Solution I messed with this for hours. I also searched all over the web and can't find anything that is similar. None of the problems I could find gave a value, they just gave lambda. Anyway, I have no idea what...
  36. T

    Maximizing Spring Elongation in Charged Object System

    Homework Statement Two equal and opposite charged objects of magnitude 2C and mass 2kg are attached to a spring of spring constant 4 N/m in the natural length of the spring. The system is suddenly placed in a uniform electric field of field strength 5 N/C in the direction of electric field...
  37. Spinnor

    5 positivly charged particles on sphere, min energy configuration, rel

    Assume 5 charged particles (charge 1) constrained to live on the surface of a sphere are in a configuration that minimizes electrostatic potential energy. Are there configurations that are stable but that are not the minimum energy configuration? A simple computer program could quickly(?)...
  38. D

    Potential outside charged metal sphere.

    Homework Statement Find the potential outside a charged metal sphere (charge Q, radius R) placed in an otherwise uniform electric field E0. Explain clearly where you are setting the zero of potential. Homework Equations The Attempt at a Solution My only problem here is that I...
  39. F

    Charged Particle Beams: Uses & Potential Applications

    Besides proton therapy: What are charged particle beams currently used for and what new uses could they have?.
  40. harjot singh

    Why Does the Movement of Charged Particles Create a Magnetic Force?

    here is my question,a simple one that is :- why with the movement of charged particles a magnetic force develops through it?is it have any relation with quantum?explain me all about it?
  41. C

    Charged particle in a magnetic field

    Just doing some homework with magnetic fields and was just wondering, why is a charged particle affected by a magnetic field only when its in motion? Physics teacher didn't know so, just wondering if any of you do.
  42. F

    Charged particle movement in arbitrary electromagnetic field

    Hello there! This is my first post here, hopefully I am not posting in the wrong place. Also, I am an engineer and have not used this stuff for years, so please be patient with me, I am pretty sure that my question is stupid :-) I would like to develop a simulation code for charged particles...
  43. T

    Decay of a moving Kaon in to two charged Pions

    Homework Statement A Kaon (k0) decays into two charged pions (π+ & π-), what is the minimum momentum required for the kaon so that none of the pions move backwards (in the opposite direction of the kaon) in the laboratory frame. Homework Equations Conservation of momentum...
  44. V

    Eletric potential created by a homogenously charged disc

    Homework Statement I've to demonstrate the electric potential that a charge q feels when it's broght from infinite to a point z. The problem is that every demonstration i found out there starts with the definition of potential eletric as dV = k. dq/ r²; but i cannot use that, 'cause my...
  45. S

    Simple harmonic motion of a charged particle in a rod

    Homework Statement Two points, each of charge Q, are fixed at either end of a frictionless rod of length 2R. Another point charge, of charge q (not Q) is free to move along the rod. Show that if charge q is displaced a small distance x (0<x<<R) from the centre of the rod, it will undergo...
  46. H

    Force between two charged particles

    Homework Statement Two particles with a similar charge are held at a distance of 3.2*10^-3 m and then released. The acceleration of the first particle is measured at 7.0 m/s^2, and for the second at 9.0 m?s^2. The mass of the first particle is 6.3*10^-7. What is the mass of the second...
  47. M

    Electric field due to uniform charged line

    Homework Statement Find the electric field at point p 5cm away from a 10cm line with a uniform charge of 2x10^-4C. so its uniformly charged from 0 - 10cm and then point p is at 15cm This question is broken down into 4 step by step parts: first is to consider 100 individual...
  48. P

    Two opposite polarity charged capacitors in series

    Homework Statement Homework Equations Q=CThe Attempt at a Solution a) I want to say that since both have the same potentials then it is similar to a parallel circuit where the charges can differ on each capacitor. If i think of point A as an input and point B as an output then the potential...
  49. P

    Two positively charged plates : interaction force

    Hello, I am facing a paradox, well it seems like one, resolving the interaction force between two equally charged plates each bearing a positive charge. Let us assume this as Q, and plates having area A. On one hand , we can claim the force = Q^2/2Ae0 where e0 is the vacuum permittivity...
  50. J

    Electrostatics - hollow charged sphere

    So we have a cross sectoin of a sphere that is charged with Q (refer to attachment). electrostatics say the electric field within a charged conductor is 0, and the electric field is perpendicular to the surface. But for a hollow charged sphere (like in the attachment), does the hollow area...
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