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. A

    Two charged spheres are brought into physical contact with each other.

    Homework Statement Two charged spheres are brought into physical contact with each other. Initially, the charge on the first sphere was 2.34 nC, while the charge on the second sphere was -3.23 nC. a) What is the final charge (in C)on either charge?(2A) b) How many electrons moved...
  2. C

    Two negatively charged balloons on strings. Find tensions?

    Homework Statement "Two balloons are rubbed with wool. Let us assume that the two balloons are at rest (in equilibrium), have unequal charges (Q > q) and unequal masses (M > m). In which string is the tension greater, T1 or T2? Show your work for your conclusion.
  3. J

    Number of electrons when something is charged

    When something is charged, is the number of excess electrons a large or small number when compared to the total number of atoms?
  4. 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
  5. R

    Electric field generated by a charged wire

    Homework Statement A charge per unit length +λ is uniformly distributed along the positive y-axis from y = 0 to y = +a. A charge per unit length −λ is uniformly distributed along the negative y-axis from y = 0 to y = −a. Write an expression for the electric field at a point on the x-axis a...
  6. M

    Electric field of a uniformly charged disk

    Hello, I am looking at an example of finding the charge of a uniform disk with a continuous charge on the surface. They go about the problem by finding the infinitesimal charge of concentric rings dq = σdA = σ(2πr dr) The part I don't understand is that they use the area as 2πr dr...
  7. S

    Uniformly charged rod(exam in 3 hours, )

    Homework Statement A rod 11.9 cm long is uniformly charged and has a total charge of −17.7 μC. Find the magnitude of the electric field along the axis of the rod at a point 46.2418 cm from the center of the rod. The Coulomb con- stant is 8.98755 × 109 N · m2/C2. lecture problem I am...
  8. S

    The electric field of a charged semicircle from its electric potential

    Homework Statement A question involving the relationship between the electric field E(r) and the electric potential V( r) is about computing the electric field on the z-axis due to a uniform line charge distribution λ spread out on a semicircle of radius R, lying on the first half of the XY...
  9. R

    Radii of eqiuipotential surfaces of a charged metal sphere

    Homework Statement A metal sphere of radius r0 = 0.29 m carries a charge Q = 0.90 µC. Equipotential surfaces are to be drawn for 100 V intervals outside the sphere. Determine the radius r of the following equipotentials from the surface. a) first:___m b) tenth:___m c) 100th:_____m...
  10. A

    Force between two charged spheres hanging from a string

    Problem Two small identical small spheres with mass m are hung from insulating threads of length L, as shown in the figure. Each sphere has the same charge q1 = q2 = q. The radius of each sphere is very small compared to the distance between them, so that they may be considered as point...
  11. S

    Point Charge and Charged Sphere; Gauss' Law

    Gauss' Law has been fairly tough for me and I seem to be struggling to analyze situations properly and, specifically, decided on the net charge included in arbitrary symmetrical-shapes used for this law. Specifically, this one includes two spherical shells. Homework Statement A point charge q1...
  12. 0

    (Very Basic) Movement of Charged Particles Through Parallel Plate Apparatus

    Homework Statement What is the electric potential two-fifths of the way through a parallel-plate apparatus (from the positive plate) if the plates have a total separation of 5cm and field strength of 5000N/C.Homework Equations Difference Potential Energy = Electric Field Strength x Distance V =...
  13. A

    Ranking forces between charged particles

    Homework Statement Two charges with magnitude (Q) experience a force (F) when held a distance apart. Rank from smallest to largest the forces between charges of the following magnitudes (q), held the following respective distances (r) apart. (There may be ties.) A) q= Q/3 r= R/3 B) q= 2Q...
  14. jtbell

    Good Grief Charlie Brown has been charged with stalking

    http://www.cnn.com/2013/01/23/showbiz/charlie-brown-actor-arrested/index.html?hpt=hp_t3
  15. A

    Uniformly charged disk and the E field some distance Z from the center

    Homework Statement Hi, I have a problem that describes a uniformly charged disk and the electric field a distance z from the center. I have found an equation that describes the E field at any point z already. Now I have to find out how the E field decreases as z increases-- as 1/r^2...
  16. K

    Electric field at a distance from a charged disk

    A disk of radius 2.4 cm carries a uniform surface charge density of 3.1 μ C/m2. Using reasonable approximations, find the electric field on the axis at the following distances. I have used the equation E=(Q/ε0)(1/(4*pi*r2)) I also tried the equation E=(Q/2(ε0))(1-(z/(√(z2)+(r2))) Thanks...
  17. S

    Potential Energy of a System of charged particles

    Homework Statement Homework Equations V = kQ/r PE = Vq The Attempt at a Solution Tried a lot of ways... get an order of magnitude less than the answer and also off by a bit too. Please help. I think you are supposed to take V at each location then multiply by q since this is PE. I carry...
  18. R

    Charged Sphere with a Hole - Check my work?

    Charged Sphere with a Hole -- Check my work? Homework Statement You have a spherical shell of radius a and charge Q. Your sphere is uniformly charged except for the region where θ<= 1° (which has σ = 0). Imagine that your fi eld point is somewhere on the positive z-axis (so z could be...
  19. 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...
  20. 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:
  21. K

    Voltage on a positively charged object?

    If I charge a van de graaff to say 10,000 V I would think of the voltage as electric pressure. There would be so many electrons looking to escape the metal ball, and this overcrowding of the electrons (electrostatic forces) would create electric pressure, or voltage. If my analogy is off, then...
  22. 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?
  23. P

    Why does a charged capacitor provide current to a circuit?

    I have a conceptual doubt concerning capacitors. Suppose that I connect the terminals of a resistor to a charged capacitor, so that current will flow through the resistor. Usually, in calculations involving capacitors, the electric field outside the capacitor is taken to be zero, because it is...
  24. 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...
  25. P

    Can Corona Discharge Occur Around Charged Glass/Dielectric?

    ...Considering there is NO dielectric breakdown or breaking of glass/dielectric..... Can there be a corona discharge ever around a charged glass/dielectric without a conductor in the vicinity? For instance; take a single-electrode glass high-vacuum tube, charge it to high voltage...
  26. T

    Electrostatical energy of charged surface in applied voltage

    Homework Statement 1. Given a coloidal polystyrene particle with a diameter of 350 nm and a surface charge of 7.73. µC cm-2 evaluate: a) the electrostatic energy under and applied voltage of 100 mV Homework Equations particle charge density: ρ = (3Q)/(4πR^3) U0 =∫V (r)dq The...
  27. J

    If the positive plate on a charged capacitor will pass current to the negative

    ...plate of a different capacitor, why won't the positive end of a battery (lets say AA) pass current to the negative plate of a different AA battery. Does it have something to do with the chemical reaction that happens inside the battery?
  28. J

    Electric Force on a charged conductive body

    Hi, how to calculate the force on a charged conductive body (ball), when that body is between two parallel plates (+V, -V) (see image), ooh and I am calculating numerically. I would first calculate the surface charges on the conductive surfaces (2 disks + ball), then calculate the potential...
  29. V

    Charged Particles and Ionization

    I'm studying A Level physics. I've read that a bubble chamber only shows up particles with a charge, as they ionize the hydrogen in the chamber, leaving tracks, whereas neutral particles don't show up. Is it therefore true then that only charged particles ionize? Because UV-radiation is ionizing...
  30. S

    Finding Kinetic Energy of Ions Leaving a Charged Plate

    I need to know how to find the kinetic energy of ions leaving a charged plate. I figure I can find the electric potential energy, but all i know is the power being supplied to the plate and the plate's cross-sectional area. Any ideas? Thanks in advance!
  31. 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
  32. A

    Mechanical force on unit area of charged conductor.

    Homework Statement OK first, I didn't know where to post this since it is and is not homework,anyways, posting here would be safest. Now, the attached scan is a proof from my (not so trustworthy) textbook and I have some doubts in it. The first doubt is in statement S1 : Every element...
  33. P

    Attraction force of atoms inside a metal sphere, near a charged plate

    Hi, I have read about electric charge and tried to understand one particular thing but still couldnt: If we positively charge a big metal plate with very high voltage and approach to it a small solid neutral metal sphere, the smaller sphere obviously will get attracted, i.e. a force will...
  34. A

    Electric field strength and potential in a charged conducting sphere

    The electric field strength inside a conducting charged sphere is zero, but why? In the book it says "that the field lines would link charges of opposite sign in the sphere and such a state of affairs is impossible under static conditions in a conductor." I don't really get this sentence. And...
  35. 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...
  36. D

    Electrostatic Printer and two plate capacitors deflecting charged ink droplets

    Homework Statement One type of ink-jet printer, called an electrostatic ink-jet printer, forms letters by using deflecting electrodes to steer charged ink drops up and down vertically as the ink jet sweeps horizontally across the page. The ink jet forms 30-μm-diameter drops of ink, charged...
  37. Q

    Charged particles and gravity

    Hello ladies and gentleman! I have a question that I have been wondering about for some time now. Does a particle with mass m and charge q have a larger gravitational field than a particle that is the same with mass m but no charge? I am assuming that the particles are static. I thought that...
  38. nukeman

    Electricity & Flies: Exploring the Safety of Charged Fluids

    Can anyone tell me some fluids that are electrically charged? And if it would be safe for, let's say, a fly to consume?
  39. D

    Final repulsed velocity of two different charged masses

    1. Two small metal spheres with masses 2.0g and 4.0g are tied together by a 5cm long massless string and are at rest on a frictionless table. Each sphere has a (mue)c charge. The string is cut, what are the velocities of the sphere when they are far apart I know two conservative qualities are...
  40. J

    Electron mass increase inside charged sphere?

    Imagine an electron of mass m_e inside a hollow dielectric sphere. Assume that the electron is traveling with constant velocity v relative to the sphere. The momentum of the system p comprises just the momentum of the electron p = m_e v There is also a circulating magnetic field B...
  41. K

    Why is H3O positively charged?

    [H3O]+ has an extra electron, so shouldn't it be negatively charged? Similarly, [NCO]-, with (for simplicity sake) a ressonance structure of N=C=O means N needs an electron, and thus the whole molecule is short of one electron. Doesn't that mean it is positively charged?
  42. M

    Is there any other software to visualise n-body interaction of charged particles

    Is there any other software to visualise n-body interaction of charged particles in real time by modelling both electric AND magnetic forces, like this: "Virtual Bubble Chamber" Electric and Magnetic Fields: Positron & Electron do the helix dance...
  43. C

    Uniformly Charged Circular Disk

    Homework Statement In what direction (using cylindrical coordinates) around a uniformly disk does the electric field NOT point? Homework Equations The directions could be r, θ, or z. The Attempt at a Solution I don't think it can point in the θ or the z direction-- either one would...
  44. P

    Electric field lines from a solid charged sphere.?

    What would be the pattern of electric field lines 'inside' a solid charged sphere..?
  45. Physicist50

    Electromagnetically Charged Wave Light

    I was wondering if light when it's in wave form (seeing as when it's in wave form it's an electromagnetic wave, energy alternating from electric to magnetic in a continuous pattern) has an electromagnetic charge, and if so, what would it be?
  46. joe_cool2

    Maximum velocity of charged beads

    OP's edit: Please ignore - SOLVED Maximum velocity of charged beads **Never mind, solved** Homework Statement Bead A has a mass of 15 g and a charge of -5.0nC. Bead B has a mass of 25 g and a charge of -10.0 nC. The beads are held 12cm apart and released. What is the maximum speed achieved...
  47. P

    Electric field near infinite charged sheet and point charge

    Electric field near charged sheet is sigma/2E Which is independent of the distance from it.. However In case of point charge, as we go very close to it, magnitude of electric field tends to infinity.. But why doesn't this happen with charged sheet, i mean it can also be considered as...
  48. H

    Calculating Charge and Electric Field Inside a Spherical Cavity

    Homework Statement A spherical charged ball of radius "a" has an empty spherical cavity, of radius b<a, at its center. There is no charge outside the ball and no sheet-charge on its outer surface. The (radial) field has given value Ea on the outer surface; inside the ball it is given as...
  49. H

    Charged Disk Homework: Solve E&M Qs

    Homework Statement A charged disk of total charge "Q" and radius "a" lies in the xy-plane, centered at the origin. The surface-charge density distribution is nonuniform, having the surface-density, at any point inside the disk at distance "r" from the center of the form σ(r)= m x r^2 , m...
  50. J

    So what does a single photon do to a group of charged particles?

    I have heard, but never seen a representation, that we know the characteristics of photons because of their reaction with other charges particles. So what exact physical motions are induced on the particles when a photon travels through them. Does the magnitude of the electric and magnetic...
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