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. B

    Electric Field of Uniformly Charged Ring

    A uniformly charged ring of radius 10.0 cm has a total charge of 58.0μC. Find the electric field on the axis of the ring at the following distances from the center of the ring. (Choose the x-axis to point along the axis of the ring.). I know the equation I want to use is E=...
  2. yango_17

    Charged balls connected by spring

    Homework Statement Consider two small balls with charges +q and -q, connected by a spring with spring constant k. A homogeneous electric field E has been turned on. E is collinear with the line that connects -q to +q. By how much will the string stretch? Homework Equations Coulomb's Law...
  3. K

    Charged Particles (Potential Energy)

    Homework Statement Figure 24-21 shows four pairs of charged particles with identical separations. (a) Rank the pairs according to their electric potential energy (that is, the energy of the two-particle system), greatest (most positive) first. (b) For each pair, if the separation between the...
  4. C

    A positively charged wire bent into a semi-circle

    Homework Statement A positively charged wire is bent into a semicircle of radius R, as shown in the figure below. The total charge on the semicircle is Q . However, the charge per unit length along the semicircle is non-uniform and given by λ=λocos(θ) What is the relationship between λo, R...
  5. yango_17

    Potential for a charged ring and point charge system

    Homework Statement A ring of radius R lies in the x-y plane with the center at the coordinate origin. The ring is uniformly charged with with a uniform charge density +λ. a) Charge +q is brought along the z-axis from -∞ to the center of the ring. What is the increase in total potential energy...
  6. gracy

    Is conducting shell =uniformly charged thin spherical shell?

    I want to ask Is conducting shell same as uniformly charged thin spherical shell? Because while finding Electric field due to uniformly charged thin spherical shell surface charge density is taken the same happens in case of conducting/metallic shell all the charges reside on surface similarly...
  7. K

    Two charged beads on a plastic ring

    Homework Statement Two charged beads are on the plastic ring in Figure (a). Bead 2, which is not shown, is fixed in place on the ring, which has radius R = 63.3 cm. Bead 1 is initially on the x axis at angle θ = 0o. It is then moved to the opposite side, at angle θ = 180o, through the first and...
  8. Alan I

    Detector moving toward charged ring - rate of change of V

    Homework Statement A thin ring (radius r = 1.41 cm) carries a charge Q = 8.57 pC distributed uniformly along its length. The ring lies in the y-z plane, so the axis through its center is the x-axis . A small detector is moving along the positive x-axis toward the ring at velocity v = -0.543i...
  9. Alan I

    Proton falling through tiny hole on charged shell

    Homework Statement Suppose a hollow metal shell (outer radius 25.3 cm, inner radius 5.2 cm) carries charge Q = -7.99 pC. There is a tiny hole in the sphere, so small that it does not affect the charge distribution or the electric field created by the charge. An proton is released from rest at...
  10. nomadreid

    Electric field lines from a moving charged particle

    The electric field emanating from charged particle travels at the speed of light; fine. To pose an unrealistic thought experiment (a more realistic, if more complicated, thought experiment could replace this one, but the unrealistic one gives the idea), if a proton were to suddenly pop into...
  11. M

    Electric potential of a charged ring

    Homework Statement Find the electric potential of a ring of radius R that is charged uniformly with a linear charge density λ. Homework EquationsThe Attempt at a Solution I wasn't sure which section to post this in but I finally landed here. It isn't really a problem that I'm troubled solving...
  12. davidbenari

    Calcs. for continuous charged media don't explode?

    Title doesn't let me be sufficiently clear so let me do it here: The potential for a continuous charged object is ##V(\vec{r})=k\int\frac{dq}{|\vec{r}-\vec{r'}|}## and similarily for the electric field. This makes sense outside of the charged object but not inside! Namely, I say it doesn't...
  13. yango_17

    Electric Field due to Charged Washer

    Homework Statement A thin flat washer lies in the x − y plane, with the center at the coordinate origin. The washer has an inner radius R1 and an outer radius R2 (so it looks like a disk of radius R2 with a concentric circular cut-out of radius R1). The surface of the washer is uniformly...
  14. yango_17

    Electric Field Inside a Charged Insulating Sphere

    Homework Statement A charged spherical insulating shell has inner radius a and outer radius b. The charge density on the shell is ρ. What is the magnitude of the E-field at a distance r away from the center of the shell where r < a? Homework Equations Gauss' Law The Attempt at a Solution I...
  15. teetar

    Questions about charged objects in isolation

    Not sure if the title accurately conveys my questions, but my question is, in such a situation that an object is charged and in hanging from an insulating thread, will it eventually lose its charge? This seems extremely simplistic, and my instinct is to say of course, but for whatever reason...
  16. W

    Finding theta of a charged pendulum

    Homework Statement a small spherical insulator of mass 6.00×10−2 kg and charge +0.400 μC is hung by a thin wire of negligible mass. A charge of −0.220 μC is held 0.290 m away from the sphere and directly to the right of it, so the wire makes an angle theta with the vertical. What is the angle θ...
  17. C

    How do you calculate the voltage between two charged nodes?

    If: 1) you know the vertex and individual charge of each node and 2) voltage is the difference in electric potential energy between two nodes How do you calculate the voltage in a vacuum?
  18. G

    Electric potential at center of charged rod

    Homework Statement Find potential of a uniformly charged rod of length 2a Homework Equations -Superposition The Attempt at a Solution dV=\frac{kλdx}{r}, r=x V=λk\int\limits_{-a}^a \frac{1}{x}\mathrm dx=0 Potential at point B is zero. Is this correct?
  19. B

    Experiment of water defection with a charged rod

    Homework Statement A student designs an experiment to measure how electrically charged a plastic rod is. She knows a charged rod will deflect a stream of water from a tap. The student plans to measure the angle of defection of the water stream when she brings the rod towards it. She expects...
  20. Mnemonic

    Cylindrical Gaussian Surface around charged rod

    Homework Statement a) 21.4-nC of charge is placed on a 4.8-m long steel tube with a d = 5.9-cm diameter. What is the magnitude of the electric field as a radial distance of r = d / 3? b) What is the magnitude of the electric field as a radial distance of r = 20 d? I was able to determine the...
  21. G

    Electric field at point between two finite charged wires

    Homework Statement Two parallel charged wires are in vacuum. Width of wires is equal to the distance between them. Calculate electric field in the middle (point A). Homework Equations Superposition The Attempt at a Solution Using superposition, y components on vector E are cancelled. I get...
  22. Roy Stout

    Charged particles passing through a magnetic wave?

    Random thought... Is it possible for a charged particle to travel fast enough, or simply enter a magnetic field at just the right time in the magnetic wave's cycle, to pass through the magnetic field unaffected? If so, what is that calculation. If not, why not. Roy
  23. Noctisdark

    Electric field due to a charged sphere

    Another problem that yet I haven't managed to solve, finding the electric field due to a charged sphere of radius R using integration Homework Equations Continuous charged distribution $$|\vec E| = \frac{1}{4\pi\epsilon_0}\displaystyle \int\frac{\rho (r') dV}{r'^2}$$ The Attempt at a Solution...
  24. Noctisdark

    Electric field due to a charged disk

    Homework Statement I'm reading Griffith-Introduction to electrodynamics, In chapter 2 about electrostatics, I've encounter few problems that I've managed, to solve (luck !), I'm asked to calculate the electric field due to a charged disk of radius R in a point P above the center (Pic) Homework...
  25. Benevito

    Neutral and charged exitons (trions)

    How can we distinguish between neutral and charged exitons?
  26. M

    Calculating Distance Between Two Charged Objects

    Homework Statement What is the distance between two charges of - 5.00 C each if the force of electrostatic repulsion acting on them is 4.00 x 10^3 N?Homework Equations F=kq1q2/r^2 The Attempt at a Solution i got 7.5km... I am not sure if that's right
  27. L

    Motion of charged particles in electric and magnetic fields

    Homework Statement 1) Describe and explain what happens to the electron beam on the screen of a teltron tube as the EHT(electrical high tension) voltage increases from 3000V to 3500V. 2)What is the effect of E field on light waves? Homework EquationsThe Attempt at a Solution 1) The beam...
  28. fluidistic

    Charged particle in a B field, tensor notation

    Homework Statement A charged particle of charge q with arbitrary velocity ##\vec v_0## enters a region with a constant ##\vec B_0## field. 1)Write down the covariant equations of motion for the particle, without considering the radiation of the particle. 2)Find ##x^\mu (\tau)## 3)Find the...
  29. nmsurobert

    Charged ball exiting a box....

    Homework Statement A small ball has mass 3.4x10^-8 kg and charge of 2.0x10^-5 C. It enters a box with initial speed 1.2x10^4 m/s. The point where the charge leaves the box is at a voltage 350kV higher than the entry point. Find the speed of the ball as it leaves the box. [/B]Homework Equations...
  30. J

    Voltage drop for a charged capacitor

    Homework Statement What is the voltage drop across the 1000 Ohm resistor when capacitor is fully charged? Homework Equations V(t) = {V_i}*e^{-t/RC} = {V_i}*e^{-t/Tau} The Attempt at a Solution In RC circuit experiment, initial is 9V and final is 2V. The voltage drop should be difference...
  31. THE BEAST

    q1=q2 & L1=L2 for Equal Level Charged Pendulum

    1. Two small spheres with masses m1 and m2 hang on weightless, insulating threads of length L1 and L2. The two spheres carry charges of q1 and q2 (like charges) respectively. The spheres hang such that they are at the same level with one another. The threads are inclined at angle theta 1 and...
  32. R

    Charged capacitor discharges to neutral cap energy losses?

    I want to calculate the total energy lost when a charged capacitor discharges to a neutral capacitor. It is my understanding that voltage will remain constant in the discharge, but current will decrease. What factors should be accounted for in any energy losses that would occur in this process?
  33. M

    MHB Electric field and magnetic field acting simultaneously on a charged particle

    The problem that I'm working on states: "An electron has initial velocity (12j +15k)km/s and a constant accelaration of (2.0 x 10^12 i) m/s^2 in a region of uniform electric and magnetic field. If B equals 400i microTeslas, find electric field E. I know how to do most of the components of this...
  34. G

    Find electric potential at a center of charged rod

    Homework Statement Find electric potential at a center of charged rod with charge 'Q' and length '2a' if referent point is at infinity. Homework Equations Electric potential of a point charge: V=kQ/r Electric potential via electric field: integral (Edl) The Attempt at a Solution I used...
  35. Proz3m0

    How to derive kinetic energy equation for charged particles

    I know there are some threads discussing about the Lorentz force equation but this is something different I came across and I couldn't find anyway to derive that formula. To be specific I'm talking about a charged particles in a magnetic field, where F=vqB and everything that is moving has...
  36. S

    Coupled differential equations for charged particles

    Hello, I wanted to study the behaviour of electrons in a spatially bounded system. I want to have a larger number of electrons, but I took 3 to start with and arrived at this system of coupled equations: \begin{align}\begin{bmatrix} \mathbf{\ddot{x_{1}}}\\ \\ \mathbf{\ddot{x_{2}}}\\ \\...
  37. E

    Electric Field of a Uniformly Charged Cylindrical Surface

    Homework Statement An infinitely long cylindrical surface of circular cross-section is uniformly charged lengthwise with the surface density σ = A cosΦ where Φ is the polar angle of the cylindrical coordinate system whose z axis coincides with the axis of the the given surface. Find the...
  38. I

    Electrostatics- Charged Identical Spheres

    In electrostatics, why is it that identical spheres that are touched for a brief moment or connected by a conducting wire (wire not gaining any charge) should have an equal charge? Why is that they come in an equilibrium of charge? For example - If we take 2 identical spheres one bearing a...
  39. C

    Wave propagating inside moving charged particles

    Hello. Sorry if my question sounds somewhat weird (I'm a mathematician, not a physicist). I am trying to understand something for my work. I would like to know what is your opinion about it. Assume that there are two electrodes inside a vacuum tube, with a difference of potential between them...
  40. K

    Infinitely Long Charged Cylinder in a Maxwellian Plasma

    Hi guys, having a hard time figuring out where to start on a plasma physics related problem. Homework Statement An infinitely long metallic cylinder with a radius of ##r_0## is immersed in a Maxwellian plasma. An electric potential, ##\phi_0##, is applied to the cylinder. Assuming that the...
  41. Quotes

    Calculating Potential at Apex of Charged Cone

    How to calculate the potential at the apex of uniformly charged right circular cone (charge only at the curved surface), having height "h" and radius "R" and lateral height "l" and change density sigma?
  42. R

    Charged massive particle reacting to EM wave

    Homework Statement Consider a particle of charge q and mass m, free to move in the xy plane in response to an electromagnetic wave propagating in the z direction (might as well set δ to zero) a) Ignoring the magnetic force, find the velocity of the particle, as a function of time. (Assume the...
  43. S

    + charged sphere and - charged sphere touch and separate

    Homework Statement A small metal sphere X is charged by losing 500 electrons. An identical metal sphere Y is charged by gaining 1000 electrons. The two spheres are first put in contact with each other and then separated. If -e is the charge on an electron, what is the charge on each sphere...
  44. AdityaDev

    Electric potential on circumference of charged ring

    I heard that maximum electric potential for charged ring is at its circumference. Is there an expression to find the electric potential at any point on the circumference of a charged ring?
  45. X

    If current doesn't flow in an open circuit, how are capacitors charged?

    When answering a related question on physics forum, I found something I seemed to be confused about: Suppose we have a battery connected in series to a capacitor with no charge. A capacitor with no charge on it acts like an open circuit. I know what happens next: the battery charges the...
  46. J

    Charged Capacitors - Homework Equations & Attempt at Solution

    Homework Statement A 10nF and 20nF capacitor is independently charged to respectively 40V and 50V. The positive sides of the two capacitors are connected, and a 1kΩ resistor is connected across the negative terminals. Find equations for total voltage VT(t) across the resistor and voltages...
  47. Y

    Electric Potential Energy Inside a Charged Sphere

    Homework Statement A point charge q<0 lies just outside a uniformly and positively (non-conducting) charged ball. Assume the charge can pass through the ball freely. Describe the motion of the charge. Homework Equations Coulomb's force law, energy equation. The Attempt at a Solution Obviously...
  48. lonely_nucleus

    Can hot objects become charged?

    Because a hot object like a hot metal has a lot of heat flowing through them are they charged? What are some ways to charge objects.
  49. mooncrater

    Two oppositely charged wires and their capacitance

    Homework Statement Two long wires with the same cross section are arranged in air PARALLEL to each other . Assume both have opposite charge densities +λ and -λ. The distance between the axis of the wire is η times larger than the radius(r) of wires cross section . What would be the capacitance...
  50. Y

    Electric field due to 2 charged spheres

    Homework Statement The first part is to calculate the electric field everywhere in space given a body of 2 spheres of radius R and distance d apart (d<R), located on the z-axis, with charge density ρ and -ρ. Of course when r>>R this is essentially a dipole. The second part is to approximate the...
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