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

    Uniformly Charged Cylinder - Potential at distance d?

    Homework Statement Consider a uniformly charged solid cylinder of radius R, length L and charge density ρ. Find the potential at a distance d (> L/2) from the centre of the object, along the axis of the cylinder. Homework Equations V=∫kdq/r The Attempt at a Solution For me, it...
  2. M

    Magnitude and Direction of E-field at a Point Due to a Charged Rod

    Homework Statement There is a non-conducting charged rod with length L=.0815(m) and linear charge density λ=-5.9x10-14(C/m). The rod is placed parallel to and on the x-axis, and at a distance a=.12(m) from the right-most end of the rod is point P. Calculate the magnitude and direction of E...
  3. E

    Application of Gauss's Law to Charged Insulators

    Homework Statement A cylindrical shell of radius 7.00 cm and length 240 cm has its charge uniformly distributed on its curved surface. The magnitude of the electric field at a point 19.0 cm ra- dially outward from its axis (measured from the midpoint of the shell) is 36.0 kN/C. Use approximate...
  4. R

    A charged rod transfers electrons to a neutral conductor

    An initially neutral conductor contains a hollow cavity in which there is a + 65.0 nC point charge. A charged rod transfers - 75.0 nC to the conductor. Afterwards, what are the charges along the inner surface and the exterior surface? I understand that the charges from the rod are equally...
  5. S

    Removal of dielectric from a charged capacitor.

    There is a parallel plate capacitor having capacity C. It initially has got no charge on it. Now we insert a dielectric material of dielectric constant K between its plates (it still has no charge). Now we connect this capacitor (with dielectric) to a d.c source of potential difference V. Now...
  6. D

    Charged particles deflecting in a statics question.

    [SOLVED] Charged particles deflecting in a statics question. Homework Statement A particle mass 2g and carrying a charge of q is suspended from a light, insulating thread. A second particle carrying an equal and opposite charge is held near to the first particle in the same horizontal plane...
  7. mrspeedybob

    Thoughts on electrically charged black holes

    Suppose there exists a black hole with a large + electrical charge. The escape velocity for any given particle will depend on the net force on it, gravitational + electrical. It seems logical that the more positive a particles charge the lower its escape velocity will be from any given point. If...
  8. V

    Gauss's Law and charged conductors

    A conductor carries a net charge +Q. There is a hollow cavity inside the conductor that contains a point charge -Q. In electrostatic equilibrium,what is the charge on the outer surface of the conductor? A. -2Q B. -Q C. 0 D. Q E. 2Q I know that the answer is 0, however, I cannot...
  9. J

    Charged cork ball suspended

    Homework Statement A charged cork ball of mass m is suspended on a light string in the presence of a uniform electric field, as shown in the figure below. When E = (Ai + Bj) N/C, where A and B are positive numbers, the ball is in equilibrium at the angle ?. b) Find the tension in the...
  10. L

    Electric Field On Charged Cylinder

    I need to find the electric field at all values of radius for an infinitely long cylinder of charge. It's in insulator of radius R, and has a volume charge density \rho = \rho_{0}(\frac{r}{R}) while r<R. I need to find the electric field at all points first off. I'm not entirely sure how to go...
  11. K

    Finding Electric Field of Charged Dielectric Sphere

    Homework Statement There is a charged dielectric sphere of radius R. I center it at the origin of an x,y,z cartesian system. It has a charge density rho=3Qcos(theta)/4*Pi*R^3. Q and R are given. I need to find the Electric field at a point that is outside the sphere. Homework...
  12. B

    Motion of a Charged Particle in Electric & Magnetic Fields

    I can't figure out what is the motion of a charged particle at rest at origin in a constant uniform magnetic field when it is subjected to an oscillating electric field starting t = 0. I need to find the equations representing its motion.
  13. A

    Uniformly Charged Ring Acting on a Particle

    Homework Statement Solve for the Electric force exerted on a Particle a distance z above a uniform ring of charge Q. Determine the potential energy of the charge where the charge lies directly in the center. Homework Equations F=kq1q1/r^2 The Attempt at a Solution Knowing E=F/q I...
  14. B

    Potential at a Distance away from a FINITE continuously charged plane

    Homework Statement This is primarily a question that I'm trying to program into python. I want to know the potential at some distance (x,y) from the center of a square plane. Homework Equations V = integral (k/r) dq The Attempt at a Solution The way I see this mathematically is a...
  15. A

    Force exerted by a charged rod on a point charge

    Homework Statement Determine the electric force exerted on a negative point charge –Q located a distance d away from a line segment of charge, extending from –L/2 to +L/2 along the x-axis. The line segment has a non-uniform charge distribution, lambda(x)=lambda_0*x . Homework Equations...
  16. S

    Charged ring and charged particle problem

    The Problem is as follows: A ring of diameter 7.50 is fixed in place and carries a charge of 5.50 uniformly spread over its circumference. A) How much work does it take to move a tiny 3.80 micro-columb charged ball of mass 2.00g from very far away to the center of the ring? B) What...
  17. R

    Accelerating charged particles

    They say accelerating charged particles emit electromagnetic radiation(emr). Ok. Take a mass m, apply a force F on it and it will cause acceleration. All the energy i apply on m will go to its kinetic energy, so conservation of energy is obtained. Now take a charged particle p, apply force f and...
  18. M

    Electric Dipole - Oppositely charged hemispheres

    Homework Statement A sphere of radius a carries a uniform charge density \rho_0 in one hemisphere and the opposite charge density -\rho_0 in the other hemisphere. The charged sphere produces an electric potential \Phi (r,\theta,\phi). For r>>a, the potential to leading order is of the...
  19. E

    Potential energy for a dipole between 2 infinitely large charged sheets

    Homework Statement A dipole consisting of charges +/- e 220 nm apart is placed between two very large (essentially infinite) sheets carrying equal but opposite charge densities of 125 uC/m^2. a) What is the maximum potential energy this dipole can have due to the sheets, and how should it...
  20. xaratustra

    Charged particle and virtual photons

    Imagine I am sitting on a lead ion and fly happily through the LHC tube :approve:. Suddenly I feel an strong force pushing me sideways to the left. A physicist sitting in the lab frame tells me later, that I have been going through a dipole magnet yoke with field lines from top to bottom...
  21. jegues

    E Field due to 2 parallel oppositely charged strips

    Homework Statement Two parallel, very long strips are uniformly charged with charge densities \rho_{s} and - \rho_{s}, respectively (\rho_{s} > 0). The cross section of the structure is shown in the figure attached. The width of the strips is the same as the distance between them (i.e. a)...
  22. jegues

    Charged Square Contour (E Field)

    Homework Statement A line charge of uniform charge density Q' is distributed along a square contour a on a side. The medium is aie. Find the electric field intensity vector at a point that is at a distance a from each of the square vertices. Homework Equations The Attempt at a...
  23. J

    Electric field of a continuously charged semicircle rod at center

    Homework Statement A uniformly charged insulating rod of length 14.0 cm is bent into the shape of a semicircle. The rod has a total charge of -7.50\muC. Find (a) the magnitude and (b) the direction of the electric field at O, the center of the semicircle. Homework Equations...
  24. Telemachus

    Electrostatics, infinite charged hollowed cylinder

    Hi. I want to know if I did this on the right way. The exercise says: An infinite hollowed cylinder, with the cavity being another concentric cylinder has a uniform charge density. Find the electric field and the potential over all space. And this is how I proceeded. I've called the inner...
  25. W

    Initial Velocity of Charged Particle in Electric/Magnetic Fields

    Hello all, I got this question off mastering physics and was unable to understand it. I eventually gave up to concentrate on other assignments and asked for the answer. I was unable to come up with more than one answer I thought possible without resorting to trial and error. Answer: Vx,Vy,Vz =...
  26. J

    Charged Particles Probem

    Homework Statement Identical isolated conducting spheres 1 and 2 have equal charges q and are separated by a distance r large compared to the diameters of the spheres. The electrostatic force acting on sphere 2 due to sphere 1 is 3.10-6N. Suppose now, that the third identical sphere 3, having...
  27. O

    Schroedinger's Equation for Electromagnetic field induced by charged wire

    Greetings all! I'm completely new to Quantum Mechanics (my PhD research is in Computer Vision) and I am planning to apply some concepts to my research. I would like to know whether it's possible to get the Wave Equation over the components of a \mathbf{B}=(B_\phi,B_r,B_z) field induced by...
  28. D

    Magnetic Moment of a Charged, Rotating Sphere

    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 \mu is related to the angular momentum \vec{\mu}={\frac{5q}{6mc}}\vec{L} Homework...
  29. J

    Charged particle suspended from elastic cord

    Homework Statement A charged particle with mass m = 200g and charge q = 25 µC is suspended from an elastic cord with force constant K = 5 N/m in a vertically upward electric field E of magnitude 3.7 x 10^5 N/C. What is extension of the cord when the particle is in equilibrium? Homework...
  30. T

    Point Charge and Charged Sphere

    Homework Statement A point charge q1 = -7 μC is located at the center of a thick conducting shell of inner radius a = 2.6 cm and outer radius b = 4.9 cm, The conducting shell has a net charge of q2 = 1.1 μC. What is Ex(P), the value of the x-component of the electric field at point P...
  31. M

    Diameter of a soap bubble increases when it is charged

    "Diameter of a soap bubble increases when it is charged." why?
  32. N

    Electric field of a charged ring.

  33. X

    Breaking & building a charged hollow sphere

    A charged hollow sphere with surface charge density \sigma & radius R is cut into two hemispheres...certainly the hemispheres with equal charges on them would repel each other...Now a force is applied on both the hemispheres to align them again as the original sphere..i shall be highly thankful...
  34. C

    Quick yes or no charged disc e field equation question

    Homework Statement the e field is given by (2*pi*k*omega)[1-(1+(R^2)/(z^2))^-.5] I was wondering if the capital R in that equation is the radius of the charged disk? And if so, why is it capitalized?
  35. D

    Human body grounding a charged object

    In a very good book, Chabay and Sherwood explain that when an initially uncharged person touches a negatively charged metal object, free electrons from the metal neutralize some Na+ ions in the salty layer on the person's skin. The person then becomes negatively charged and the neutral Na atoms...
  36. Drakkith

    Does Gravity Cause Accelerating Charged Particles to Emit EM Radiation?

    An accelerating charged particle produces EM radiation. Does gravity cause this effect as well? Does the particle actually accelerate due to it or would it not since it would be following a straight path through curved spacetime? I'm guessing the particle would not create EM radiation, but I'm...
  37. L

    Gauss's Law on a Charged Sphere

    Hi I'm sorry if this is posted in the wrong section or it's laid out wrong but I have a question that I need a bit of help with. Homework Statement I'm given: A spherically symmetrical charge distribution is contained within a sphere of radius a with no charge outside. At a distance r (r...
  38. R

    EM Radiation oscillating charged mass

    Homework Statement A particle of mass m and charge q is attached to a spring with force constant k, hanging from the ceiling. Its equilibrium position is a distance h above the floor. It is pulled down a distance d below equilibrium and released, at time t = 0; Under the usual assumptions...
  39. R

    Finding Charge of Two Charged Spheres

    Homework Statement Two hard rubber spheres, each of mass m = 15.1 g, are rubbed with fur on a dry day and are then suspended with two insulating strings of length L = 4.90 cm whose support points are a distance d = 2.97 cm from each other as shown in the figure below. During the rubbing...
  40. A

    Two of Breivik's victims: Can he be charged for pre-meditated homicide?

    Anders (not the monster) became only 18. As he and two friends tried two hide from the shooter they heard, they tried to secure a place on a mountain ledge, but Anders slipped and fell 10 meters onto the stony shore. He was killed by that accident. Håkon became only 17. Håkon was not a...
  41. R

    Magnetic force on a charged particle

    I am considering a positive charged particle moving with the velocity v into the magnetic field field B making an angle theta with the magnetic field, so the magnetic force exerted on the charged particle is perpendicular to the plane of B and v. My question is-Why the speed of the charged...
  42. 5

    Effect of an uncharged sphere touched to charged sphere

    Homework Statement Two identical metal spheres, each with a positive charge q, are separated by a centre-to-centre distance r. What effect will the following change have on the magnitude of the electric force exerted on each sphere by the other: -one sphere is touched by an identical...
  43. O

    How to determine the charged particles between a distance?

    I would like to determine the negative charged level on q2 particle, referring to following image, q1 is charged particle with x unit of positive charge, which q1 diameter is 80 cm, on the other hands, q2 is a neural particle, which q2 diameter is 30 cm. Both charged particles are separated in d...
  44. P

    Solving for Acceleration of a Charged Particle

    Homework Statement A 2.50-mg dust particle with a charge of 2.00 µC falls at a point x = 2.80 m in a region where the electric potential varies according to V(x) = (2.00 V/m2)x2 − (1.00 V/m3)x3. With what acceleration will the particle start moving after it touches down? (Enter the magnitude of...
  45. A

    Finding the E-field between two infinite plane charged sheets

    Homework Statement Two infinite-plane non-conducting, thin sheets of uniform surface charge p1 = 13.35 uC/m2 and p2 = -8.65 uC/m2) are parallel to each other and d = 0.245 m apart. (As shown in the diagram below.) What is the electric field between the sheets? (Note: the field is positive if...
  46. J

    Classical charged particle's reaction to its own retarded field

    Classical charged particle's reaction to a retarded field This is something I've been curious about for a while -- every once in a while, I'll see some random reference to it in an article, but I never feel like it's the whole story. The situation is this -- you have a moving classical...
  47. A

    Can massless charged particles exist in nature?

    Is it possible to have a massless charged particle in nature?
  48. A

    Why hasn't lightning charged the earth?

    The Earth has been struck by lightning for 4.5 billion years.Then why is it that the Earth has acquired no [or negligible] charge. I Have also heard that their is a permanent potential difference between the Earth's atmosphere and surface.What is the cause of this?Why doesn't lightning...
  49. S

    Electromagnetism: Finding Electric Field of non Uniform Charged Rod

    Homework Statement Here is the question: Thin rod AB has length l=100 cm and total charge q=37 nC that is distributed in such a way that its line density ? is proportional to the square of the distance from the end A, i.e. ?(x) =kx^2. Determine electric field E at the end A of the rod. ...
  50. N

    Electric Field on finite charged rod

    Homework Statement Thin rod AB has length L=100 cm and total charge q0=37 nC that is distributed in such a way that its line density \lambda is proportional to the square of the distance from the end A, i.e. \lambda(x) =kx^2. Determine electric field E at the end A of the rod. Homework...
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