What is Charged particle: Definition and 271 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. L

    Charged particle passing through velocity selector

    Homework Statement A velocity selector uses a 64mT magnetic field perpendicular to a 28kN/C electric field. At what speed will charged particles pass through the selector undeflected? Homework Equations v = E/B The Attempt at a Solution [/B] Using dimensional analysis, I converted units T...
  2. E

    Calculating Electric Force of a Point Charge on a Charged Particle Thread

    Charged Particle thread with linear charge force Homework Statement A uniformly charged thread with linear charge density 5 C/m lies along the curve y = (3/m) x^2 for 0≤x7m. The y component of the electric force it exerts on a 6 C point charge located at (3m, 0m, 2m) is given by...
  3. J

    What-If: Massless, Charged Particle

    Please note that I neither hypothesize the existence of such particle, nor know any evidence of it. This is purely a what-if scenario. So, my questions are: 1)Is there any law or whatsoever that forbid the existence of a massless particle that possesses charge? 2)If such particle exist, how...
  4. ShayanJ

    Charged particle on a sphere with magnetic dipole at its center

    I just wanted something to play with so I thought of this problem and solved it but now I have questions about it. Consider a charged particle with charge q and mass \mu which is constrained to move on the surface of a sphere of radius R. There is a magnetic dipole with moment \vec m=m \hat z...
  5. Satvik Pandey

    Time of approach of two oppositely charged particle

    Homework Statement Two point charges q1=1\muC and q2=-1\muC with mass 1g each are at distance 1m from each other. The charges are released from rest at . Find the time t in seconds at which they collide. Homework Equations F=kQ1*Q2/r^2.The Attempt at a Solution Let the dist. of separation...
  6. S

    Can a charged particle be in uniform motion in reality?

    If a charged particle is at rest, external magnetic field cannot move it. If an external electric field is applied, the particle will get accelerated. Now the external magnetic field will exert a force on the particle perpendicular to its motion. This will change the direction of motion of the...
  7. A

    Propagation of charged particle inside a set of magnets

    Hi I am trying to find the equations of a charged particle inside a dipole & quadripole. Practically, I need to write a simulation program for it which assumes a beam passing through a dipole-quadripole-dipole which are setting around an arc. Is there some recommended literature ? Of course...
  8. T

    Motion of a Charged Particle - Jumbled Notes, Unsure of Possibility

    1. Problem - Notes Jumbled, do not know if I am missing variables or not needed to answer the questions? Disclaimer: I am good at maths, fine with algebra and derivations, I just forget the formulae and units, especially when I haven't practiced things a lot, such as this topic (other subjects...
  9. F

    Charged Particle Moving in a Magnetic Field

    Hello. Can you please check out the attachment? Solving (a) is easy. The correct answer to (b) is "the period for the return trip is unchanged" (that is, T = 130 ns). Okay, fine: the attachment shows why T only depends on m, q, and B. How on Earth, though, do you reconcile this with the...
  10. L

    Electric field due to a charged particle at a random point in space

    Can we calculate the electric field at any given point in space even if there are no charged particles there? The equation for electric field given in a standard EM course is kqq0/q0r^2 where q0 is a test charged impacted by the electric field. How about just any point in space?
  11. U

    Charged particle moving under electric field

    Homework Statement A charged particle having charge q and mass m is projected into a region of uniform electric field of strength E, with velocity v perpendicular to E. Throughout the motion apart from electric force particle also experiences a dissipative force of constant magnitude qE and...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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?.
  20. 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.
  21. 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...
  22. 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...
  23. A

    Magnetic field of a moving charged particle

    A moving charged particle produces a magnetic field around it, thus a stationary observer would notice a moving electric and magnetic field. Does this moving magnetic field (as seen by the stationary observer) in turn produce another electric field?
  24. O

    Right hand rule charged particle direction question

    1. Two charged particles are traveling in circular orbits with the same speed in a region of uniform magnetic field that is directed into the page, as shown. The magnitude of the charge on each particle is identical but the signs of the charges are unequal. Which one of the entries in the table...
  25. Crazymechanic

    How Do Charged Particles and Electric Fields Interact?

    Ok so I have few question and would be happy if someone could answer them or reassure me of the way I think is right, thank you. First of all do electrons that have higher energy levels can attract two ions closer than electron with lower energy? Or is it a fundamental property that has to...
  26. Q

    Magnetic energy of charged particle?

    Consider a situation where you have a charge at rest in a uniform magnetic field.A sharp impulse is given to the charge in a direction perpendicular to the magnetic field,if the velocity is high enough the charge which starts revolving in circular path should behave like a current carrying...
  27. T

    Finding v of a charged particle in a uniform magnetic field

    Homework Statement So there's a rectangular region in the xy plane subjected to a magnetic field B with strength 0.06T pointing in the -z. A proton moving in the xy plane enters the region with velocity v such that the velocity components are initially vx = v*cos(24), vy = v*sin(24). It...
  28. J

    Calculating total force on charged particle

    Homework Statement A particle with charge 3 μC is located on the x-axis at the point -10 cm, and a second particle with the charge 4 μC is placed on the x-axis at -4 cm. What is the magnitude of the total electrostatic force on the third particle with the charge 7 μC placed on the x-axis at -2...
  29. F

    Measuring the momentum of a charged particle

    I am relatively new to particle physics, and I seem to have reached confusion already. I do not seem to comprehend how you could measure the momentum of a charged particle just by exerting force and a magnetic field on it. The formula F = Bqv is mentioned when I hear of this, which does not...
  30. mesa

    Does a charged particle rotate when traveling through a static Bf?

    I have been looking at mass spectrometers, in particular the interactions between the Bf ind of a charged particle in motion in a static Bf of the spectrometer. Figure 1 and 2 shown below are a basic 2 dimensional slice of the problem from the top (fig 1) and from the inside of the radius...
  31. Nemo's

    Motion of a charged particle in an electric field

    Homework Statement Each of the nuclei below are accelerated from rest through the same potential difference.Which one completes the acceleration with the lowest speed? 1H1 4He2 7Li3 9Be4 Homework Equations F=ma=QE The Attempt at a Solution v∝a∝Q/m so for lowest v Q/m lowest is 1 so...
  32. A

    Magnetic Fields of a Relativistic Charged Particle

    Where can I find a picture of the magnetic field lines produced by a charged particle moving near the speed of light? Is there a formula for the strength of B and direction of field lines as v --> c? Does this equation reduce to Ampere's right hand rule for a moving charge's ability to create...
  33. pratikaman

    Problem with use of 'velocity' of charged particle in lorentz force eq

    if we assume a charge particle enters in a uniform magnetic field with velocity V w.r.t inertial frame as shown fig. then according to the situation shown there will be force acting on particle due to magnetic field (neglecting B field induced due to charged particle itself). But now if we...
  34. M

    Charged particle focusing device

    Hi, Is there a device that can attract alpha or beta particles and focus them on a point. Something like the reverse of a CRT tube for electrons. BR, Adam
  35. P

    Problems with a Charged Particle in a Magnetic Field

    I was wondering about what the wavefunction of a particle in a magnetic field would look like, so after some quick work and a little research, I found the the Hamiltonian is \hat{H} = \frac{(\hat{p}+qA)^{2}}{2m} where A is the vector potential such that B=∇×A. I thought that the vector...
  36. C

    Energy spectrum of charged particle

    Homework Statement Homework Equations a(+) = (-ip+mwx)/(2hmw)^1/2 a() = (+ip+mwx)/(2hmw)^1/2 The Attempt at a Solution can i use these operators to solve this problem? please help me i need to give this homework tomorrow morning :confused:
  37. D

    Can a Charged Particle Lose its Charge While Moving at Different Speeds?

    hi PF, i got a question in my mind while studying electrostatics that Will a charged particle loose its charge if it travels with a speed a) Less than speed of light? b) Close to speed of light?
  38. D

    The work done by an electric field in accelerating a charged particle?

    Homework Statement A particle with a charge of 3.2x10^-19 C accelerates from rest between two charged plates. The electric field is uniform and is 39000 N/C. The distance between the plates is 4.5x10^-3 m. A) Calculate the force on the particle B) How much work is done by the electric...
  39. M

    Integrating a Uniform Magnetic Field: Solving for ∫Bdl

    Homework Statement I already worked out the right hand side. What is giving me problems is figuring out the left hand side, ∫Bdl Since B is uniform, it can be removed from the integral leaving B∫dl now I'm stuck. Homework Equations The Attempt at a Solution
  40. S

    Runge-kutta method for a force acting upon a charged particle

    I have this project that involves the runge-kutta method, and I honestly have no clue what I am doing. I never learned about this before, and I don't know much about ordinary differential equations. I am learning all of this next semester but it is required information for this project. In...
  41. A

    Classical Charged Particle backward in time/Feynman Stueckelberg interpretation

    Hello Friends, I was trying to illustrate intuitively (rather than rigorously) the equivalence of negative energy solutions moving backward in time to be equal to a particle of opposite sign a la Feynman. I begin with a quote from the maestro himself "A backwards-moving electron when...
  42. S

    Can charged particles be used as a barrier for destroying or displacing objects?

    Idea... charged particle berrier use of ionized particles moving at such high voilositys to and from 2 points such as copper and aluminum detract and attract so any objects that move between the 2 points gets intersected by the charged particles and destroyed or displaced.
  43. M

    What happens when a high speed electron collides with a stationary cation?

    What 'could' happen when a high speed electron hits a stationary cathion?
  44. J

    Trajectory of charged particle in uniform gravitational potential

    It sounds like an easy-enough problem, but even writing down the ridiculously nonlinear equation that would need to be solved is making my face hurt. I'm talking classical/Newtonian gravitation, action-at-a-distance, constant-force. It could really be any external non-EM conserved force...
  45. N

    Gravitational field caused by a charged particle

    I am new to General Relativity, so this question might sound silly. I know that the source of gravitational field is the stress-energy tensor. What I wonder is how do I find the spacetime metric, gmn caused by a stationary charged particle? What is the stress-energy tensor of a stationary...
  46. S

    Initial energy of a charged particle

    Homework Statement Ernest Rutherford in his lab at McGill University, Montreal, fired alpha particles of mass 6.64 * 10^-27 kg at gold foil to investigate the nature of the atom. What initial energy must an alpha particle (charge +2e) have to come within 4.7 * 10^-15 m of a gold nucleus...
  47. H

    Charged particle within an electric field

    Homework Statement Homework Equations DON'T KNOW The Attempt at a Solution I can honestly say I've never been this confused by a question. At first my mind automatically went to a=qE/m since I have both charge and mass, but it became apparent that the equation was irrelevant...
  48. B

    Motion of a charged particle in a uniform magnetic field

    See attachment. I don't why a charged particle in a uniform magnetic field will move in a circle. Why can't it just continue straight in the direction its going until another force acts on it?
  49. G

    Charged Particle Moving in Magnetic Field

    An electron is accelerated through 2.4 x 105 V from rest and then enters a uniform 1.7 T magnetic field. What are the maximum and minimum values of the magnetic force this particle experiences? QV = 0.5mv2 F=QvB Basically, I've got a final value from the above equations, but I'm not...
  50. Spinnor

    Charged particle in a box, variable m and e.

    Say we have one spin-less electron in a box in the ground state. Say we have dials on the outside of the box that can vary mass and charge of the spin-less electron. Suppose we start with one spin-less electron in a box with m and e set to as near zero as we please, but not zero. As m and e go...
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