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. H

    Bouncing charged ball experiment

    Hello, I would like to share a cool experiment... but not yet experimented for me. Suppose you have a ball of metal between two plates. The upper plate is charged - and the lower plate is charged + There is constant potential between the plates. When the ball touches the lower plate, it...
  2. F

    Magnetic fields and charged particles

    Hi, just reviewing some of my physics material, and realized I had a question that has never been answered for me. I know that charged particles, traveling parallel to a magnetic field, feel no force either forwards or backwards, but feel a force perpendicular that causes them to spiral...
  3. D

    Electric Field of Uniformly Charged Ring: Derivation Explained

    hi every one on an exercise on book we ask us to find the electrical field for a uniformly charged ring where we going to find : E=kqz/(z2+R2)3/2 then we have to derivate it wth respect to z and we find : dE/dz=kq*(R2+2z2)/(z2+R2)5/2 so my question is how do we get this derivation ?
  4. S

    Calculate the electric potential of a charged bar

    Consider that the bar has a linear density λ and is in the x axis. Also consider that V=0 in infinite. Determine the potential in point P. I can calculate it, but I don't understand how the bounds of the integral are supposed to be determined: dq =\lambda dx'\\ r = x + x'\\dV =...
  5. P

    Capacitance of capacitor with unevenly charged plates

    Homework Statement I'm almost embarrassed to post this, but insofar none of my searches online have yielded any results. My question is simply, given a parallel plate capacitor (for the purpose of simplicity let's assume that there are no edge effects) whose constituent plates have charge +aQ...
  6. H

    Radiation from a charged harmonic oscillator

    Anyone know if there are any graphical simulations online for the field of a charged harmonic oscillator, or better yet maybe some kind of paper on it?
  7. 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...
  8. S

    Do Charged Objects Lose Their Charge in Air?

    If I have a charged object in contact with normal air (but nothing else) and insulated, does it lose charge over time? Does the answer depend on the object being an conductor or an insulator itself?
  9. C

    Charged mass connected to spring, swung in circle in mag. field

    Homework Statement A spring with an unstretched length of 20 cm and a force constant of 100 N/m is attached to a 2-kg mass with a charge of 3.0 C. The mass is swung in a circle in a zero gravity environment, so that the spring is perfectly horizontal and is parallel to the radius of the...
  10. E

    Net Power In a Charged Rotating Cylinder

    Homework Statement A long hollow nonconducting cylinder (radius R= 0.060 m, length L= 0.70 m) carries a uniform charge per unit area of σ= 4.0 C/m^2 on its surface. Beginning from rest, an externally applied torque causes the cylinder to rotate at constant acceleration α= 40 rad/s^2 about the...
  11. S

    Capacitance of a capacitor in which the first plate is (-)vely charged

    I have read that if we have an isolated positively charged conductor, we can increase itself capacitance by bringing an identical conductor close to it and then earthing it, so, that the second conductor develops a negative charge and thereby helps in reducing the net electric potential on the...
  12. I

    Capacitors charged to voltage in parallel

    Homework Statement Suppose you have a capacitor with capacitance C charged to voltage V and a second capacitor with capacitance C charged to voltage 2V. The two capacitors are connected in parallel. What will be the voltage across the two capacitors after being connected in parallel?Homework...
  13. C

    Electric field due to a hollow, charged cylinder

    Homework Statement Find the electric field at a point on the x-axis due to a uniformly charged, hollow cylinder. The x-axis is parallel to the cylinder and goes through it's centre. One end of the cylinder is located at the origin. Homework Equations R = radius of cylinder Q = charge on...
  14. I

    Charge surrounded by charged conducting sphere

    A spherical conducting shell with charge total q surrounds a charge –2q at the center of the shell. The charges on the inner and outer surfaces of the shell are respectively I know that if the conducting sphere has no charge the inner and outer charges would be +2q, and -2q respectively but...
  15. W

    Drift velocity in uniform magnetic field near charged wire

    Problem (a) Derive and expression (using cylindrical coordinates) for the drift velocity of a particle of mass m and charge q in a uniform vertical magnetic field B\hat{z} when the particle is located at a perpindicular distance p from a long, straight vertical wire carrying a line charge...
  16. 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...
  17. 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...
  18. 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...
  19. S

    Magnetic Moment of a Charged, Rotating Sphere Problem

    Homework Statement Show for a solid spherical ball of mass m rotating about an axis through its center with a charge q uniformly distributed on the surface of the ball that the magnetic moment μ is related to the angular momentum L by the relation μ=(5q/6mc)L Homework Equations μ=IA/c...
  20. K

    Finding voltage from a fully charged capacitor?

    Homework Statement I am given a circuit in which my homework is asking my to find the time constants of this circuit: The problem wants the time constants and then wants to find the voltage response when the circuit is in the position connecting the 2k ohm resistor. the capacitors...
  21. J

    Capacitor charged then Connected to another Capacitor.

    Homework Statement One capacitor is charged until its stored energy is 4.0 J, the charging battery then being removed. A second uncharged capacitor is then connected to it in parallel. (a) If the charge distributes equally, what is now the total energy stored in the electric fields?(b) Where...
  22. P

    Electric field on the surface of uniformly charged spherical shell

    We can easily find from gauss's theorem(or otherwise) the field inside and outside a uniformly charged spherical shell.But i was wondering what would be the field on the surface of the shell.
  23. D

    Electric field along the y-axis of a charged semicircle

    Homework Statement Find the electric field along the y-axis of a charged semicircle (with the center of the circle in the origin) with radius R, with a uniform charge distribution $$ \lambda$$ ...
  24. L

    Does the concept of dipole moment of charged molecule exist or not?

    Generally the concept of dipole moment is used in neutral system, ie the total positive charge equals to the total negtive charge. Could the concept and also the calculation be used in charged system? For example, NaOH, (Na+)(O-2)(H+), we can calculate its dipole moment. Could I calculate...
  25. Evo

    News Fifth Graders Charged With Murder Conspiracy

    So, these two obviously violent individuals could be released in 2 years or less? I keep reading that serial killers start by torturing and killing animals when they are children. I wouldn't be surprised if these two are also into that, but have also decided to move on to humans. I'd like...
  26. R

    Find electric field a distance from a charged sheet

    Homework Statement For a sheet of infinitesimal area, find the electric field 9 mm from the surface if the charge density is 5 μC/mm^2. Homework Equations E=σ/2ε0 The Attempt at a Solution E=(5x10^-6 C/m^2)/(2*8.85x10^-12) = 2.8 x10^5N/C I know the correct answer is about...
  27. R

    Find a point charge a distance form a charged rod

    Homework Statement See image Homework Equations KQ/r^2 The Attempt at a Solution I have seen several different ways of working this problem, but they have all failed on me. I tried this using the equation above from my book E = (8.99x10^9)(1036 C)/(4x10^-6m) E= 2.328x10^18 N/C I also...
  28. E

    Potential of a uniformyl charged sphere

    Homework Statement The question asks to find the potential due to a uniformly charged sphere at r<R where R is the radius. Homework Equations Va-Vb= ∫ E dr from a → b The Attempt at a Solution My attempt was like this Va is to be a the point of interest r.. Vb to be R... We...
  29. B

    Electric Potential and Potential Energy Due to Charged Particles

    Two charged particles of equal magnitude are located along the y-axis equal distances above and below the x-axis. Plot a graph of the electric potential at points along the x-axis over the interval -3a<x<3a. You should plot the potential in units of (KeQ)/a Let the charge of the particle...
  30. M

    E field above charged spherical surface

    the calculation of the E field a distance z above a spherical surface of charge gives rise to this integral which can be done by partial fractions...I don't see this integral in Stewart's table did I not input correctly in Mathematica? Integrate [(z-R*u)/(R^2+z^2-2*z*R*u)^(3/2),{u,-1,1}]...
  31. B

    Maximum possible force between two electrically charged plates?

    Hi! What is the limit to how much you can electrically charge two plates? I want to create the maximum possible force between the two plates per kilogram of plate. Say that the plates are separated by a good vacuum, because that is the best insulator, right? The plates are also surrounded...
  32. T

    Electric Potential of a Uniformly Charged Sphere

    My book gives the electric potential of a uniformly charged sphere as \frac{1}{4\pi \epsilon_0}\frac{Qr^2}{r_0^3}. I can't derive this forumula. What I get is \frac{1}{8\pi \epsilon_0}\frac{Qr^2}{r_0^3}. I can guess how the book did it which is by taking the equation for voltage of a single...
  33. C

    Are All Charged Molecules Polar and Can Polar Molecules Be Uncharged?

    Hi, Is it correctly understood that all charged molecules are polar (if they have a charge at some point, they must also have a unequal distribution of positivity and negativity) but polar molecules can be charged or uncharged ( they have Δelectronegativity)
  34. L

    Need help with gauss law and charged ring AP Physics FRQ

    Homework Statement 1. 2. Homework Equations ∫E.dA = Qenc/\epsilon_{o} \lambda=Q/L \rho=Q/V V= q/4πε_{o}r The Attempt at a Solution these types of problems i suck at, i don't know how to do these at all independently, and is there any difference in question 2 if there is an insulator or...
  35. G

    Capacitors with unequally charged plates?

    I'm currently on the chapter on capacitors in my physics book. I'm starting to get the concept, but everything still isn't crystal clear. I get that you can store charges in two plates, one containing a charge of Q, and the other a charge of -Q. But, would it not also work if the charges where...
  36. B

    Electrically connected charged balls

    Hello, I am reading through the problem given in this link: http://physicstasks.eu/uloha.php?uloha=300 There is one sentence I am particularly unsure of, "Charged ball's potential is in direct proportion to the charge of the ball and in reciprocal proportion to the ball's radius." Why is this...
  37. V

    An infinite charged line moving with velocity V and its energy current

    Homework Statement Consider an infinite charged line along the z-axis, with linear charge density . The charge moves uniformly with velocity v in the positive z direction. 1. Give an expression for the electric and magnetic field. 2. Give an expression for the energy flux density (or energy...
  38. D

    Electric Field outside charged metal sphere

    Homework Statement A metal sphere of radius 10 cm carries a charge of +2μC uniformly distributed over its surface. What is the magnitude of the electric field due to this sphere at a point 5.0 cm outside the sphere's surface? 8.0 x 109 N/C 4.2 x 106 N/C 8.0 x 107 N/C 4.0 x 109 N/C 4.0 x...
  39. M

    Capacitor charged then disconnected

    Hello, I am confused as to what happens when a capacitor is charged by a battery, disconnected, and then connected to a second uncharged capacitor. Is the situation different for whether the two capacitors are connected to each other in series or parallel? If in series, shouldn't the charges...
  40. P

    Length contraction on charged wire

    Lets say we have an infinite charged wire with a line charge \lambda on it. Now when I move with respect to this wire the E field will increase do to length contraction. And there will also be a B field that we could calculate with ampere's law. But the increased E would make it seem...
  41. teroenza

    Surface Charge of Uniformly charged sphere

    Homework Statement In the section on the discontinuity of the electric field (Griffiths introduction to electrodynamics) there is the following. "Where there is no surface charge, the perpendicular component of the electric field (to the surface) is continuous, as for instance at the...
  42. O

    Calculating Electric Field and Potential of a Charged Ring Segment

    Hi everyone, i have been looking at this problem for a few days now and i am pretty stuck, ill explain why first the problem : a charge Q is distributed over a ring section of radius r, between angles 90 and 180. find the V and E at the origin. Now the problem I am having ais everything...
  43. P

    Capacitors are charged, disconnected from battery, and had plates swit

    Homework Statement Capacitors C1=13μF and C2=21μF are each charged to 10V, then disconnected from the battery without changing the charge on the capacitor plates. The two capacitors are then connected in parallel, with the positive plate of C1 connected to the negative plate of C2 and vice...
  44. B

    Two Oppositely Charged Parallel Planes, Infinite In Extent

    Homework Statement Two parallel plates having charges of equal magnitude but opposite sign are separated by 14.0 cm. Each plate has a surface charge density of 37.0 nC/m2. A proton is released from rest at the positive plate. (a) Determine the magnitude of the electric field between the plates...
  45. U

    Electric Field On A Point Charge Due To A Uniformly Charged Rod

    Homework Statement This is regarding setting up an integral to calculate the electric field on a point charge that is at a distance "a" from a uniformly charged rod of length "L". I have attached a picture of my work, which includes a diagram of the problem, and wanted to know if my thought...
  46. E

    Uniformly charged distributions (Electricity)

    Homework Statement Positive charge +Q is distributed uniformly along the +x axis from x=0 to x=a. Negative charge - Q is distributed uniformly along the +x axis from x=0 to x=-a. A positive point q lies on the positive y axis, a distance y from the origin. Find the force (mag and dir.) that...
  47. V

    Electric Field due to a charged conducting sheet

    Homework Statement A conducting sheet 10m x 10m x 1mm carries a charge of 1 mC. What is the electric field magnitude in kV m-1 just above the centre of the sheet?Homework Equations ρ=Q/Volume E=ρ/2ε0 The Attempt at a Solution I have arrived at an answer by the following: ρ = 1x10-3C / 10m...
  48. E

    Field of a uniformly charged disk

    I have a question about the electric field of a uniformly charged disk with radius a. I'll move point by point till i reach the part i really can't get. First of all, the surface area is made of infinite number of RINGS! So, we basically integrate the charge of the rings from r="0" to r="a"...
  49. Crazymechanic

    Can Electrons in an Electrically Charged Gas Generate Voltage?

    Hello, could you please share some insights on the matters I'm about to ask. The examples will be without any numbers of real physical dimensions more like theoretical concepts. In a fluorescent lamp or gas discharge lamp the electrons flow from cathode to cathode(anode ??) as I believe...
  50. michael879

    Energy stored in charged ring current

    I'm a little disappointed in myself for not being able to calculate this or find the answer online, but I've hit a bit of a mental block so I was hoping someone could help me out a bit. I was doing a thought experiment involving kerr-newmann black holes, and basically I would like to calculate...
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