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. M

    Metal sphere drawn and then repelled by charged rod

    Homework Statement An uncharged metal sphere hangs from a nylon thread. When a positively charged, nonconducting glass rod is brought close to the metal sphere, the sphere is drawn toward the rod. But if the sphere touches the rod, the sphere suddenly flies away from the rod. Explain why the...
  2. L

    Electric field at a point inside of a uniformly charged ball

    As the name of the thread says, I am wondering what would the amount and the direction of the electric field at some point in the uniformly charged ball of radius R(it has a constant charge volume density) be at the distance r from the centre of the ball. Does anyone know what would they be? I...
  3. Y

    Force on a charge due to charged sheet

    Homework Statement I want to find the force on a positive charge placed at a distance ##d## from a positively charged infinite plate. Of course, it can be simply done by finding the electric field due to the plate using Gauss's Law. But my teacher suggested a different method and I am unable...
  4. 1

    Radius of charged particle moving in magnetic field

    Homework Statement So, I got the problem from a friend who told me he copied it down in haste, so it's possible that my confusion stems from a missing variable, but I just want to be certain as my exam is in a few days. So the problem states that there's a +2 helium atom that was accelerated by...
  5. S

    Cycloid motion of a charged particle.

    Does the cycloid motion of the picture only apply to a particle at rest in the x y and z axis? What if it is moving with a velocity parallel to the magnetic field before the electric field accelerates it? I think it will then move in a spiral; although, I am not sure.
  6. M

    Charged mass hanging in electric field

    Homework Statement My teacher came yesterday, and put in the board one exercise, just the scheme, not aditional data, i have one picture of the scheme Homework Equations The given E its mean to electric field The Attempt at a Solution I need some help, go get the right way into problem [/B]
  7. J

    If a charged particle is released from rest....

    Homework Statement [/B] A) Calculate the electric potential at point A. B) If a small charged particle with a mass m=5.0 mg and charge q=7.0 nC is released from rest at point A, what will be its final speed vf Homework Equations V=Kq/r Uelec=qV Uelec=1/2mv2 The Attempt at a Solution A) I...
  8. M

    Potential due to non-uniformly charged disk

    Homework Statement 2. Equations v=q/4πrε 3. Attempt at solution Can I find the total charge by integrating the charge density equation from 0 to 2π and then plug that into the above equation?
  9. K

    Energy and charged particle collisions

    Homework Statement Find the initial velocity of an alpha particle with a mass of ##6.64 \times 10^{-27} kg## and a charge of ##+3.2 \times 10^{-19} C##, if it undergoes a head on "collision" with a gold nucleus. You may assume the gold nucleus does not move at all during the interaction. The...
  10. ajeet mishra

    Electric field inside a uniformly charged cubical box

    I have read that electric field at any point( not only at center) inside a uniformly charged spherical shell is zero(by symmetry). But if we take a uniformly charged cubical box, will electric field be zero at every point inside the box? I am confused please help ( I think it should not be zero...
  11. yeezyseason3

    Electric Field inside a charged ring

    Homework Statement Given a charged ring in 2-d, what is the e-field inside the ring? Homework Equations Epoint = kq/r^2 The Attempt at a Solution This isn't a homework question, but more of a problem I keep running into whenever I think about it. I assumed it was 0. I came to this conclusion...
  12. A

    Negative plate of a charged capacitor is connected to positive plate

    What happens when negative plate of a charged capacitor is connected to positive plate of another charged capacitor and vice versa. ?
  13. gracy

    Electric Pressure on a Charged Surface due to External EF

    Why he did not consider parallel force?Will parallel component of electric field not produce electric pressure on the surface?
  14. Z

    Electric field of a non-uniformly charged ring

    Homework Statement Calculate the magnitude and direction of the electric field due to the ring in the point P on the z-axis. Homework Equations Charge distribution on the ring is given by λ(φ)=λ_0\cdot sin(φ). This should result in the total charge on the ring being zero. Electric field is...
  15. MusWolf

    Electric field at (x,y) from uniformly charged rod.

    Homework Statement A thin rod carries a charge Q distributed uniformly over its length L , and is situated on the x-axis between x=±L/2. Find the electric field at an arbitrary point (x, y). (You will have to do separate integrals for the x and y components.) Homework Equations ∫dE=∫kdq/r2...
  16. Plok

    Is the sun positively charged?

    Hydrogen fusion as described by proton-proton chain reaction that dominates in the sun produces two positrons for each helium nucleus produced. These annihilate with free electrons while the number of protons remain the same. Over time the sun is supposed to become positively charged, yet the...
  17. J

    Charged sphere and neutral rod

    I'm totally confused what the question is asking. I do not know how to start... please help A charged sphere with 1×108 units of negative charge is brought near a neutral metal rod. The half of the rod closer to the sphere has a surplus charge of 2×10^4 units. What is the magnitude of the...
  18. H

    Why V=max inside a charged sphere?

    Inside a charged sphere, the electric field strength is zero because there are electrostatic forces from all directions. I can't understand why electric potential inside the charged sphere is maximum ?
  19. G

    Light interaction with charged particles

    Does anybody know what happens when say a laser accelerates charged particles? Do photons get absorbed and the intensity of the laser drops, or do they get absorbed and scattered and there's a redshift of the photon etc
  20. N

    Distribution of force acting upon two charged objects

    Coulombs law states 2 point charges of opposite sign will attract where acting simultaneously on two point charges and as follows: The formula calculates the force that will act and implies the force be equally experienced by both points of charge even if one charge is much greater than...
  21. ft92

    Electric Field between two charged plates

    Homework Statement Two large, parallel, conducting plates are 7.5 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 1.3 × 10-15 N acts on an electron placed anywhere between the two plates. (Neglect fringing.) Find the magnitude...
  22. P

    Electrostatics -- the case of a charged cylinder

    Hello , I post a message because I will need help with this exercise I would like to knowif my answer are good, I'm french : An infinite hollow cylinder charge is constituted of a sheath whose outer limits are R2 and R3. Wearing a uniform charge density ρ Question 2)calculate the total...
  23. I

    Charged particle hitting electric field at angle?

    If I have an electric field between a cathode and an anode, are there electric field lines between the plates? If yes, what happens if a charged particle enters the field at an angle? Is the force acting on the particle reduced?
  24. B

    Magnetic field cannot accelerate a rest charged particle?

    Let's see delocalized electron cloud on a surface of a metal (a piece of iron for example): When a strong Nd magnet get close the spin of these electrons allign to the magnetic field but the electrons don't move. Why? The force is not canceled out. Electrons should move and compressed in one...
  25. C

    Electrostatics || A cone charged unifomly, find intensity

    Homework Statement A cone of height H and base radius A is charged with charge Q uniformly distributed in all its volume. Find electrostatic field intensity at the top of the cone. DATA: H, A, Q Homework Equations E=ρ/(4πε0) ∫Ω dΩ/R2) and R is a vector (rr^+zz^) r^ and z^ are versors The...
  26. person_random_normal

    Understanding Earthing: Impact on Charged Bodies & Charge Distribution

    I understand earthing as - if we Earth a charged body, its charge distribution changes such that, its potential becomes zero. So now I have a doubt that if we have 2 charged spheres(Q1 , Q2) ,separated by some distance and then if we Earth one of them , then how will the charge distribution...
  27. gracy

    Simple pendulum with Charged bobs

    If two simple pendulum with charged bobs hanging from the same point are taken in a satellite ,then their strings will become perfectly horizontal. I think that should be the case when these bobs are charged with similar charges and hence repulsion occurs but what if the bobs are oppositely...
  28. K

    Commutator of Charges of the charged Weak Currents

    Homework Statement I'm having a bit of trouble evaluating the following commutator $$ \left[T^{+},T^{-}\right] $$ where T^{+}=\int_{M}d^{3}x\:\bar{\nu}_{L}\gamma^{0}e_{L}=\int_{M}d^{3}x\:\nu_{L}^{\dagger}e_{L} and...
  29. D

    Can skin be positively or negatively charged?

    Is it possible for skin to hold a negative or positive charge on one part of the body, such as the back of a hand? How does this occur? Thank you
  30. Titan97

    Field inside a charged sphere

    What is the direction of field inside a charged non-conducting sphere? Using gauss law, I can find the magnitude of electric field inside the shell by assuming a spherical Gaussian surface. But how can I find its direction? Also, if electric field exists inside a charged sphere, wouldn't the...
  31. D

    How Do You Calculate the Magnitude of a Charge in a Magnetic Field?

    Homework Statement A charged body, moving with a velocity of 8.0 * 104m/s at an angle of 30.0° with respect to a magnetic field of strength 5.6 * 10-5 T, experiences a force of 2.0 * 10-4N. What is the magnitude of the charge? Homework EquationsThe Attempt at a Solution I have no idea where to...
  32. C

    Torque of charged rotating disc in uniform magnetic field

    Hi, I'm having an issue with finding a starting point for the following problem. I've looked through my magnetism and electrodynamic notes but was unable to find a starting point. Could someone please help direct me on the correct path? Thank you. Homework Statement A thin circular disc of...
  33. G

    Force between charged and neutral sphere after scaling

    Homework Statement Consider two solid dielectric spheres of radius ##a## separated by a dis- tance ##R## (##R\gg a##). One of the spheres has a charge ##q## and the other is neutral. We scale up the linear dimensions of the system by a factor of two. How much charge should reside on the first...
  34. S

    Circle or polygon for charged particle in magnetic field....

    ...perpendicular to its path? OK; let's say you have any charged particle moving perpendicular to a magnetic field; does it describe a gigantic polygon or a perfect circle? I think it's a polygon; the particle absorbs a "quantum of force" from the magnetic field, so to speak, and changes...
  35. marciokoko

    Calculus & magnetic force on charged particle

    I'm reading how a charged particle moving through a magnetic field experiences a force (called magnetic force). I understand that it moves the particle in a certain direction and because the greatest force is experienced when the magnetic field is perpendicular to the particle's velocity vector...
  36. R

    Charged particles in a liquid and B field

    I would like to ask your opinions on what would happen if you had a liquid containing charged particles and then applied a sinusoidal magnetic field? 1. would the particles move in one direction and when the current changes direction then move in the other direction? 2. would there be a...
  37. JaredMTg

    Accelerating a charged particle generating an "electric field wave"

    Hello, My question is about accelerating charges generating electromagnetic radiation, and is more of a theoretical one, or a thought-experiment in my head...probably because I'm not totally understanding something. I was playing with this applet which simulates the electric field lines of a...
  38. gracy

    Potential due to a uniformly charged sphere

    http://www.phys.uri.edu/gerhard/PHY204/tsl93.pdf To find electrical potential at r<R I want to know why should we subtract ##V##=-##\int_∞^R\frac{kQ}{r^2}\,dr##-##\int_R^r(0)\,dr##=##\frac{kQ}{R}## I don't know why are we subtracting these two?
  39. M

    Calculating D field in a region between two charged surfaces

    1. Question: There is a wire with charge, surrounded by a metal cylinder with opposite charge. There is a dielectric surrounding the wire, going out half way to the outer cylinder. Calculate the D field in the region between the cylinder and wire.Homework Equations : [/B] Gauss's law for...
  40. Titan97

    Electric field at center of charged hemispherical shell

    Homework Statement Find Electric field at center of charged hemispherical shell Homework Equations In spherical coordinates, $$dA=R^2\sin\phi d\phi d\theta$$ The Attempt at a Solution From the image, Enet=2dEy=2dEcosφ $$dE=\frac{kdq}{R^2}E$$ $$dE=\frac{k\sigma dA}{R^2}$$ $$dE=\frac{k\sigma...
  41. moenste

    Fleming's left-hand rule on charged particles

    Homework Statement Diagrams (a) to (c) show a magnetic field of flux density 0.2 T directed perpendicularly into the paper. In each of (a) and (b) a conductor of length 0.3 m is entirely within the field and is carrying a current of 4 A in the plane of the paper. In (c) an electron is moving in...
  42. V

    Position of third charged particle

    Homework Statement Two particles are separated by a distance d, Particle A has charge +Q and Particle B has charge +3Q. At what distance from particle A along the line connecting particles A and B would you place a third charged particle such that no net electrostatic force acts on it ...
  43. M

    Potential Difference between two parallel charged plates.

    How do we find out the potential difference between two equal and opposite charged (conducting) parallel plates mathematically? Let the charge on a plate be 'Q', Total area of a plate be 'A', the distance between the plates be 'd'. I need a direct mathematical solution please, I've come across...
  44. S

    Electric Field Inside a Charged Conductor: Explanation Needed

    I understand that there is no electric field inside a charged conductor, but; I don't understand why a connection to ground made on the inner surface of said sphere will flow current. Is this not correct?
  45. N

    Electrostatic discharge current

    I understand that electrically charged objects such as a rubber balloon or even the human body can hold several thousands of volts. What's troubling me is that I know the current that results from an electrostatic discharge is not enough to cause serious damage or kill a human, yet if you touch...
  46. B

    Charged Capacitor: Is Disconnecting Dangerous?

    In this video: exactly in the 7:05, the narrator says that is dangerous to charge the inductor and disconnect it of the circuit and that is necessary provide anoter path for the current flow. The same phenomenon happens with a charged capacitor too? Is necessary provide a path for a charged...
  47. S

    Uniformly Charged Disk above a grounded conducting plane

    A uniformly charged disk has radius R. It was a charge density and is located above the conducting plane at a distance a. The disk is parallel to the conducting plane. Find the electrostatic potential at (0,0,z) in the region above the plane. The conducting plane is grounded
  48. 24forChromium

    Moving charged particle and its magnetic field

    What kind of magnetic field does a moving, electrically charged foam ball create? What are the relevant variable determining the properties of the magnetic field? Its charge? velocity? (Assume it's in space and charge is in the shape of a point) Are electrons or ions analogous to this foam ball?
  49. K

    E in the charged parallel-plate air capacitor,,,

    Homework Statement I want to know whether the magnitude of the charged electric field in the parallel plate-air capacitor is always delta/epsilon... In the last image, I have to put E=delta/2epsilon unlike the two situations above. What's the difference between the last one and the first...
  50. C

    Gauss's law for a charged ring

    Hello physics world, I am having a hard time understanding a rather simple thing. Let's consider the electric field produced by a uniformly charged ring of radius R, at a position $z$ along the ring's axis. From Coulomb's law in every textbook, we know that E_z∝Qz/(R^2+z^2). That is, there...
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