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. 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...
  2. J

    Question: will highly charged metals break apart?

    Because of the "sea of electrons" holding a metal lattice together is it possible to charge that metal so much positively (by removing enough electrons) that it will break apart due to the unbalanced repulsion between positive nuclei? normally the interaction between the "sea of electrons" and...
  3. M

    Charged particle、neutral particle will hit the ground simultaneously？

    If we drop a charged particle and a neutral particle at the same time(same hight) in a uniform gravitaional field, they will hit the ground simultaneously? on one hand：a freely falling charged particle will radiate according to a supported observer, so the radiation recoil (radiation...
  4. 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?
  5. PeteyCoco

    Electric Field over a charged cylinder using only Coulomb's Law

    Homework Statement What is the electric field at a point on the central axis of a solid, uniformly charged cylinder of radis R and length h? Homework Equations Well, I've set up the triple integral and have gotten to this point...
  6. 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...
  7. R

    Eletric potential inside charged sphere with hole inside

    Homework Statement Consider a charge density of ρ=k/r , k>0 , located between a sphere surface of r=a and another sphere surface of r=b, b>a. I'm supposed to find the electric field on all space, which I did. Now I have to find the electric potential in all space, which I also did for r>b...
  8. G

    Water bends when charged object is near

    Homework Statement Why is it that when a charged object is near a stream of water (polar), it causes the stream to bend towards the object (attraction) instead of bend away (repulsion)? I know why the water bends, but why does it not REPEL instead? Homework Equations N/A just an...
  9. FOIWATER

    How the electric field inside a charged ball is zero

    I am having issues with multiple gauss' law problems. Assume we have a charged spherical surface. Inside the surface, E=0V/m. But why? I understand that at the center it should be zero due to symmetry, but why would it be zero at some point say, inside the surface but not at the center...
  10. C

    Charged Metallic Sphere Touching Spherical Shell From Inside

    Homework Statement (From Physics for Scientists and Engineers, 7E, Serway-Jewett Chapter 25 Q11) (i) A metallic sphere A of radius 1 cm is several centimeters away from a metallic spherical shell B of radius 2 cm. Charge 450 nC is placed on A, with no charge on B or anywhere nearby. Next...
  11. F

    Electric potential of a uniformly charged thin rod.

    1. Problem statement A thin rod of length 2L has charge Q uniformly distributed along its length. 1. Draw a graph of the charge density as a function of x from -L to L 2. Find the electric potential at point P a distance y away 3. Use the result in part 2 of the electric field at point...
  12. Q

    Charged ions and high pressure

    I apologize if this is the wrong category, Hello, this is my first time posting. I loved physics concepts and theories when I was younger but after taking two physics classes in college I realized that I was struggling with the math and had to give up on my dream to become a theoretical...
  13. O

    Equilateral triangle charged rods

    Homework Statement Three rods each of uniform charge Q and length a are formed into an equilateral triangle. Given[Q,a,q] determine: 1. The voltage at the center of the triangle. 2. If a charge -q is placed at the center of the triangle determine potential energy. 3. Determine the initial...
  14. michael879

    The Equilibrium Point of Shrinking Charged Shell: A Classical Analysis

    I've been looking into this relatively simple problem out of curiosity and I have to say I've thoroughly confused myself, hopefully someone can provide some insight: Imagine you have a massless (for simplicity) spherical shell with some overall charge on it that starts at a radius of...
  15. M

    Point Charge in the presence of charged, insulated, conducting sphere

    So here we are talking about solving this problem by method of images. The approach taken by most of electrodynamics textbooks is as follows: "If we wish to consider the problem of an insulated conducting sphere with total charge Q in the presence of a point charge q, we can build up the...
  16. P

    Electrodynamics Potential from charged sphere. I am lost :/

    ~Electrodynamics~ Potential from charged sphere. I am lost :/ Homework Statement A sphere of radius R, centered at the origin, carries a charge density ρ(r,θ)=κ/r^2(R-2r)sin^2(θ). κ is constant. Find exact potential. Homework Equations 1/4∏ε∫ρ∂t/r The Attempt at a Solution Question and...
  17. N

    Voltage of a point around an infinite long charged wire.

    Lets say i have a infinitely long wire with charge per length, λ and a point, p of a position with its closest distance to the wire is y. The wire extend infinitely parallel to X-Axis. How to determine the voltage at the position p? Can i first regard the voltage contributed by a very small...
  18. O

    Electrostatics problem - accelerations of charged beads

    Electrostatics problem -- accelerations of charged beads Hi everyone Im reworking my MP homework and I can't seem to get the right answer for this problem(26.32). The set up says: A 1.5g plastic bead charged to -3.9nC and a 3.8g glass bead charged to 17.6nC are 2.2 cm apart(center to...
  19. 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...
  20. J

    Reaction-at-a-distance: Might charged plates immediately repel?

    Imagine that we have a pair of parallel plates, A and B, separated by some distance as in Fig. 1 below. At time t_1 we simultaneously charge both the plates. This could be done by previously sending a light signal to a charging apparatus at each plate from a source located at the...
  21. Y

    How Does Gauss's Law Apply to a Uniformly Charged Sphere?

    Homework Statement A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 10.5 cm, giving it a charge of -22.3 µC. (a) Find the magnitude of the electric field just inside the paint layer. (b) Find the magnitude of the electric field just...
  22. T

    "Charged Balloon Expands When Blown Up

    Homework Statement The charged balloon expands as it is blown up, increasing in size. Here is a link. It is question 15. http://cf.linnbenton.edu/mathsci/physci/rajabza/upload/wkbk_solutions_27.pdf Homework Equations The Attempt at a Solution Is that answer correct...
  23. K

    A Charged Sphere with a Cavity

    Homework Statement An insulating sphere of radius a, centered at the origin, has a uniform volume charge density ρ. A spherical cavity is excised from the inside of the sphere. The cavity has radius a/4 and is centered at position h(vector) , where |h(vector) |<(3/4)a, so that the entire...
  24. S

    Charged, Insulating Sheet question

    1. a sphere with mass 4.00 kg and charge of 5.00 C hangs from a thread near a very large, charged insulating sheet. The sheet is to the left of the sphere, and the sphere is is attracted toward the sheet, to the left. The charge density on the surface of the sheet is uniform and equal to...
  25. cgar666

    Find electric field on a point due to a charged arc.

    Homework Statement A charge of 25nC is uniformly distributed along a circular arc (radius = 2.0 m) that is subtended by a 90-degree angle. What is the magnitude of the electric field at the center of the circle along which the arc lies? I'm not getting the right answer however, so if someone...
  26. G

    Two Charged Masses Suspended From Strings

    Homework Statement Two similar tiny balls of mass m are hung from silk threads of length L and carry equal charges q. The angle formed by the two strings is bisected by an imaginary line, forming angle θ. Assume that θ is so small that tan θ can be replaced by its approximate equal, sin θ...
  27. 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...
  28. S

    Magnetic moment of a solid, uniformly charged ball

    Homework Statement Show for a solid spherical ball of mass m rotating through its centre 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: \textbf{μ} = \frac{5q}{6mc}\textbf{L}Homework Equations μ...
  29. F

    Finding electric field of a bent uniform charged rod.

    1. Problem statement. 2. Known equations. E = k § dq/r^2 Lamda = Q/L 3. Attempt. I am having trouble figuring out the dq in this situation. I know that lamda = Q/L, and since those 2 are the variables that are changing I take the derivative of them so it looks like Lamda = dq/dL I...
  30. 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...
  31. M

    Oppositely Charged Parallel Plates

    Homework Statement Two oppositely-charged parallel plates are separated by a distance of 0.03m. a. What is the strength of the electric field between the two plates if it takes 2.4x10^-19 J of energy to move an electron from one plate to the other. b. What is the acceleration of that...
  32. I

    E&M Problem - 2 Charged Masses Hanging on Strings

    E&M Problem -- 2 Charged Masses Hanging on Strings Homework Statement Two charges of identical mass m, one with charge q, the other with charge 2q, hang from strings of length l from a common point. Assume q is sufficiently weak so that any angle you're looking for is very small, and find...
  33. S

    Photons and charged particles and dark matter

    Are photons capable of interacting with particles with no charge. And if not, is it possible that that's the reason dark matter has so far eluded detection: because it has no charge?
  34. 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...
  35. andyrk

    Charged Spherical Shell and Solid Sphere

    A spherical shell and a conducting sphere each of radius R are charged to maximum potential. Which of the two has more charge? My attempt: Since in a conductor, no charge can reside inside the conductor so all charge is on the surface of the conductor just like the spherical shell. Now ...
  36. andyrk

    Why Does Earthing a Charged Sphere Neutralize Its Charge?

    When we Earth a positively charged sphere, the positive charge of the sphere vanishes. Why does this happen? When we connect two charged bodies doesn't charge redistribute till we get equipotential surface? Now when there is no charge on the sphere means the sphere has 0 potential. So that means...
  37. andyrk

    Connecting Charged spheres by a conducting wire

    When charged spheres are connected using a conducting wire, the charge will redistribute so as to make the potential constant because the connection makes them a single conductor and conductors are equipotential surfaces. My doubt was that if the spheres are of different size and have different...
  38. B

    Electric field from a charged disk

    This is rather strange and has been bugging me, from chapter 22 (Electric fields) of Resnick & Halliday: So suppose you have a charged disk of radius ##R## (the disk has no thickness and charge is uniformly spread on the surface of the disk). If you are at a distance ##z## away from the...
  39. E

    Calculating E-field and potential of a charged ring

    Hello folks! I've been trying to calculate the E-field of a charged ring. It seems well documented for a symetric point(a line from the center etc.) but what I'm interested in is say if I'm slightly of the center of the ring, how can I make a more general equation? I've tried calculating...
  40. M

    Why the plates bcomes charged as soon as they are connected?

    Hi...why the plates bcomes charged as soon as they are connecetd ?
  41. WannabeNewton

    Mass conservation charged dust

    Hi guys! This is related to a recent thread but since that thread became cluttered, I figured it would be more coherent to just ask the question here. Say we have a congruence of charged dust particles in some space-time with tangent field ##\xi^a##. The energy-momentum of the charged dust is...
  42. 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...
  43. T

    Electric field in a hollow charged sphere

    I am wondering about why the electric field in a hollow sphere with charges on its surface would be zero. I have thought about the gaussian law argument for it. It only guarantees that the net number of electric field lines that pass the encloved surface are zero. But it says nothing about...
  44. F

    Aluminium has no negatively charged particles?

    Q: "A graduate student tells you that he has observed a Schottky defect in a sample of pure aluminium. Explain why it may take a long time for this graduate student to get his Ph.D" A: "Pure aluminium has no negatively charged particles, so a Schottky effect can not occur." So I know a...
  45. Crazymechanic

    Charged Ion Beam and Electromagnetic Induction: A Neutralization Method

    A rather simple question. A confinement of positively charged ions , a tube from the confinement and in the end of the tube a metal plate at a negative potential , if the charged ions are let to run towards the negative metal plate (which they would normally do) the plate would loose it's...
  46. B

    Uniformly Charged Circular Sector problem (Electrostatics)

    Homework Statement Hi, I am having problems trying to solve an electrostatics question. Basically there are two circular sectors of radius R and with angle 2β. Both of these sectors have their vertices at the same point in the xy plane (ie at the origin) but have a separation d in the z...
  47. F

    Current induced in a charged hollow sphere

    Homework Statement A hollow spherical conducting shell is suspended in air by an insulating string, so that the sphere is electrically isolated. The total charge on the conductor is -6 μC. If an additional point charge of +2μC is placed in the hollow region inside the shell, what is the total...
  48. R

    What happens if plates of charged capacitor gradually separated?

    Say you have a charged, parallel plate capacitor, isolated from any external circuit. If you were then to gradually separate the two plates (or thicken the dielectric) what would happen to the charge on the two plates ?
  49. V

    Find Tension in String Connecting Two Charged Spheres

    Two charged objects of charge q. Coulomb's law states that the force on one sphere by the field of the other is: F = qE But each sphere experiences that, correct? So the tension for the string would be 2F. Is that correct?
  50. Q

    Relativity with Charged Particles & Fluid Approx.

    Hello community, I'm new here. I'm using FORTRAN to model the motion of electrons and ions when accelerated under a high voltage potential. I'm using a fluid approximation and MHD-like equations (conservation of mass, energy, momentum) and a finite volumes numerical method to solve the...
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