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. S

    Electromagnetism Charged Sphere Q.

    Hey, I have a series of questions on a basic charged sphere and deriving quantities such as the infinitesimal charge, the total charge and the electric field. The question is part (b) in the image below: So I found dQ' by equating it to the surface area of a shell at a distance r'...
  2. C

    Charged sphere place within a cylindrical capacitor

    Homework Statement The outer conductor (radius b, length l) of a long cylindrical capacitor is earthed. The inner conductor (radius a, length l) is hollow, insulated and uncharged. A sphere of radius R is charged to a potential V far from any other bodies and is inserted inside the inner...
  3. P

    What is the formula for the charge of a charged soap bubble?

    Homework Statement A soap bubble of radius 0.1mm has a wall thickness of 3.3x10^-8m, and is charged to a potential of 100V. Give a formula for the charge of the bubble. I know this is probably a really easy question, but I've only ever done problems with spheres of negligible wall...
  4. F

    Electric Field Strength Inside Concentric Uniformly Charged Spheres

    Homework Statement The graph in the figure shows the electric field strength (not the field lines) as a function of distance from the center for a pair of concentric uniformly charged spheres. Which of the following situations could the graph plausibly represent? (There may be more than one...
  5. N

    Gravitational field caused by a charged particle

    I am new to General Relativity, so this question might sound silly. I know that the source of gravitational field is the stress-energy tensor. What I wonder is how do I find the spacetime metric, gmn caused by a stationary charged particle? What is the stress-energy tensor of a stationary...
  6. T

    Are Charged Black Holes Just a Myth?

    Hi, I've been thinking about the concept of charged black holes. What I'm wondering is this; if light cannot escape a black hole, and photons are the bosons of the EM force, then is it meaningful to describe a black hole as having a 'charge'? If the photons can't escape the black hole, then no...
  7. S

    Initial energy of a charged particle

    Homework Statement Ernest Rutherford in his lab at McGill University, Montreal, fired alpha particles of mass 6.64 * 10^-27 kg at gold foil to investigate the nature of the atom. What initial energy must an alpha particle (charge +2e) have to come within 4.7 * 10^-15 m of a gold nucleus...
  8. J

    My Charged Insulating Marble: What Should Have Happened?

    I have a charged insulating marble -- let's say I used an electrostatic generator to get it up to 1 coulomb, and it weighs 1g (don't make me say 9.8mN). I have it in an insulating "box" whose walls and ceiling are very far away. I have it sitting still for a long time, so its E field is ~1/r^2...
  9. P

    Accelerating charged particles emit EM waves?

    I know that if you have alternating current in a wire, it will produce electromagnetic waves since the electric and magnetic field change direction continuously as the wave propagates, and that the wave direction, orientation of the E component, and orientation of the B component will all be...
  10. J

    Force between two uniformly charged identical rods

    Homework Statement Identical thin rods of length 2a carry equal charges, +Q, uniformly distributed along their lengths. The rods lie along the x-axis with their centers separated by a distance b > 2a. Find the force, F, exerted by the left rod on the right one. Left rod's center @ (0,0) → rod...
  11. T

    Will charged black holes evaporate?

    Black holes only emit hawking radiation which is black body radiation. If black holes only emit photons then the black hole can never get rid of charge which means it can never get rid of all its mass. Does this means black holes also emit charged particles?
  12. G

    Gravitational waves, electromagntic waves and charged particles

    Hi all, I am trying to out what happens when a gravitational wave caused by a monochromatic, electromagnetic plane wave interacts with a charged particle. As we all know, the electromagnetic wave causes the particle to follow a figure of eight shaped path (in the particles rest frame anyway)...
  13. H

    Charged particle within an electric field

    Homework Statement Homework Equations DON'T KNOW The Attempt at a Solution I can honestly say I've never been this confused by a question. At first my mind automatically went to a=qE/m since I have both charge and mass, but it became apparent that the equation was irrelevant...
  14. P

    Suspended Charged Object in Uniform Electric Field

    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 = (A + B) N/C, where A and B are positive numbers, the ball is in equilibrium at the angle θ. (a) Find the charge on the ball...
  15. V

    Electric field due to a uniformly charged disc

    At the end of the derivation, it is given The electric fiel due to elementary ring at the point P is dE = [2∏rσdrx]/[4∏epsilon zero (x^2 +r^2)^(3/2) ] To find the total E due to disc is given by ∏σx/4∏ε∫(2rdr)/(x2 + r2)3/2 I am stuck with the calculus done here to arrive at the...
  16. T

    Force on a point charge at the tip of a solid uniformly charged insulating cone

    Homework Statement A solid insulating cone has a uniform charge density of rho and a total charge of Q. The base of teh cone had a radius of R and a height of h. We wish to find the electric force on a point charge of q' at point A, located at the tip of the cone. (Hint: You may use the...
  17. J

    Electric field of a charged disc

    ... with constant charge density σ = Q/((pi)a^2) The Electric field is, after some calculation, is given by E_p below: z is the z-axis, and a is the radius of the disc. Now for the questions at the bottom of the page, here are my thoughts: σ is independent of a because as a->2a, Q->4Q, and...
  18. J

    Charged and Current-Carrying Strings

    The Sturm-Liouville Equation describes normal-mode solutions to the general string equation: \sigma(x)\frac{\partial^2 u}{\partial x^2}=\frac{\partial }{\partial x}\left [ \tau(x)\frac{\partial u}{\partial x} \right ]-v(x)u Where u(x) is the string's displacement from its equilibrium position...
  19. B

    Motion of a charged particle in a uniform magnetic field

    See attachment. I don't why a charged particle in a uniform magnetic field will move in a circle. Why can't it just continue straight in the direction its going until another force acts on it?
  20. P

    Voltage created by charged flat plates

    Homework Statement Two flat charged plates create a uniform electric field (E). What happens to voltage (V) when the distance (d) is doubled? Homework Equations Voltage in uniform electric field: V = E*d Capacitance equations: V = Q/C C = K * A/d The Attempt at a Solution...
  21. G

    Charged Particle Moving in Magnetic Field

    An electron is accelerated through 2.4 x 105 V from rest and then enters a uniform 1.7 T magnetic field. What are the maximum and minimum values of the magnetic force this particle experiences? QV = 0.5mv2 F=QvB Basically, I've got a final value from the above equations, but I'm not...
  22. fluidistic

    Charge distribution of a uniformly charged disk

    Homework Statement The problem can be found in Jackson's book, I think in chapter 1 problem 3 or something like this. I must determine the charge distribution of a uniformly charged disk of radius R in spherical coordinates (I've done it in cylindrical coordinates and had no problem). The...
  23. A

    How Do Magnets Work At an Atomic Level (Motion of Charged Bodies)?

    I'm a year 12 physics student and I have a keen interest in the inner workings of a magnet. I know that magnetic fields are created by the motion of charged bodies. 1. Is this somehow related to the how magnets create their fields, within their structure at an atomic level? I've heard that...
  24. M

    Work required to assemble eight identical charged particles

    1. How much work is required to assemble eight identical charged particles, each with charge q, at the corners of a cube of side a? Explain, based on your answer, whether or not this configuration is stable.
  25. B

    Electric field in a semi-circle (non-uniformly charged)

    Homework Statement A plastic semi-circle/arc with radius R has a non-uniformly distributed charge upon it. The density of the charge/length is \lambda = \lambda_0 sin\theta θ is 0 in the middle of the arc find the electric field in the point where the radius come from Homework Equations...
  26. S

    The Electric Field of a Uniformly Charged Disk

    Homework Statement A disk of radius R has a uniform surface charge density σ. Calculate the electric field at a point P that lies along the central perpendicular axis of the disk and a distance x from the center of the disk. Homework Equations Electric field due to a continuous...
  27. Spinnor

    Charged particle in a box, variable m and e.

    Say we have one spin-less electron in a box in the ground state. Say we have dials on the outside of the box that can vary mass and charge of the spin-less electron. Suppose we start with one spin-less electron in a box with m and e set to as near zero as we please, but not zero. As m and e go...
  28. T

    Magnetic force of one, moving charged particle on another (vector problem)

    Homework Statement At a particular instant, charge q_1 = 4.80×10^−6 C is at the point (0, 0.250m , 0) and has velocity v_1=(9.2*10^5 m/s) i_hat. Charge q_2 = −2.50×10^−6 C is at the point (0.150m , 0, 0) and has velocity v_2 = (-5.3x10^5 m/s) j_hat. At this instant, what is the magnetic...
  29. R

    Accelerating charged particle radiation reaction

    It is known that if a charged particle accelerates then it emits electromagnetic wave (energy). If so then this means that the work we do on particle, W=F*s, doesn't all go to particles kinetic energy, E=0.5*m*v^2. Then this means that Newton's F=m*a doesn't hold for charged objects, particles...
  30. S

    Overlapping Charged spheres: solve Electric Force of point charge (Q) locations

    I need help understanding how to calculate various Electric Field Strengths of several point charges (Q) both inside and along two OVERLAPPING identical spheres BUT with on NON-UNIFORM VOLUME CHARGE DENSITIES (-1p non-overlap density on the outside with -4p density overlapping internally) with...
  31. D

    Tension in a rope connecting charged spheres.

    Homework Statement Two positive charged spheres, with masses m = 2.0 g and with the same charge 2 µC are connected by a rope that is a distance of 5 cm. The charged spheres are at rest and the system is in static equilibrium. Homework Equations N/A. The Attempt at a Solution The...
  32. S

    Magnetic fields and charged particles

    It has been stated that a charged particle in the vicinity of a magnetic field experiences a force given by F = qV x B, which states that there is no force when its velocity is zero. It also shows that only the particles direction can be changed, not its kinetic energy. My question is this...
  33. L

    What happens when you connect a charged capacitor to 2 uncharged capacitors?

    For my electronics work I have a question to answer: "A 1000V source is used to fully charge a 1μF capacitor. The capacitor is then disconnected from the source and connected to two additional capacitors (2μF and 8μF) as shown in the circuit schematic below. a) Calculate the final voltage...
  34. J

    Finding the potential between two charged conducting shells?

    Homework Statement Suppose we have an outer shell with charge -2Q and radius b. We also have an inner shell with charge Q and radius a. what is the potential when a<r<b. Homework Equations E=kQ/r^2 V=kQ/r E=-dV/dx The Attempt at a Solution The method I have been using according...
  35. A

    Potential of a non-uniform charged rod

    Homework Statement A thin charged rod of length L lies along the x-axis as shown in the diagram below. The charge on the rod is distributed with a density of λ= c x (C /m) where c is a constant. What is the potential at a point (0,y)? (Your answer should be in terms k, c, L, and y). See...
  36. B

    Gauss's law and surface electrons on a charged conductor, contradiction?

    My textbook (Halliday & Walker) explains that a charged conductor (a solid, of an arbitrary shape) in electrostatic equilibrium will have the electric field inside be 0 and all electrons will be on its surface. It proves this by saying that if the electric field inside was not 0, the free...
  37. N

    Charged particles in parallel magnetic fields

    If a charged particle passes through a magnetic field it will be deflected according to the right hand rule, i.e. VxB. What if the magnetic field lines are parallel to the velocity of the particle? Will the particle still be deflected?
  38. I

    Graphing The ΔV between three charged metal electrodes

    Homework Statement Graphing The ΔV between three charged metal electrodes, in regards to x distance Here is the the picture I'm given with the problem. The hint tells me to assume that V=0 when x=0.Homework Equations C=Q/ΔVThe Attempt at a Solution I thought the electrodes looked kinda like a...
  39. D

    C++ Model of a charged particle in a magnetic field

    Homework Statement Im taking my first physics class and We have to do a research project. The project can be anything we want. I decided to make a c++ program to model a charged particle in a magnetic field. When I first researched the problem I't seemed straight forward enough. The force on a...
  40. X

    Work required to move charged particle traveling in a circle

    Homework Statement Hi everyone and thank you in advance for your time. I just had this problem on a physics exam (that everyone in the class bombed, and I mean everyone, including the best students). I honestly couldn't care less about the grade, but I really want to understand where I went...
  41. S

    Replacing a battery with a charged capacitor

    Homework Statement A Vbatt = 1.5 V battery stores Ubatt = 2.25 kJ of energy. I want to replace this battery with a charged capacitor that stores the same amount of energy and puts out the same voltage. That is, I want a capacitor such that UC = 2.25 kJ and VC = 1.5 V. What must the capacitance...
  42. B

    Calculating the potential energy of a uniformly charged sphere

    Homework Statement The sphere has a radius a and is filled with a charge of uniform. They way I am asked to do this is by building the sphere up layer by layer. And I know that the field outside the sphere is the same as if it were a point charge. Homework Equations U = ε/2∫E^2 dv The...
  43. M

    Finding equation for potential between concentric charged spheres

    Homework Statement A metal sphere with radius r_a is supported on an insulating stand at the center of a hollow, metal spherical shell with radius r_b. There is charge +q on the inner sphere and charge -q on the outer spherical shell. Take the potential V to be zero when the distance r from the...
  44. A

    Torque in a charged ring outside a magnetic field

    Homework Statement Homework Equations torque = MxB. The Attempt at a Solution as the ring is completely outside the magnetic field, B=0... even if its not, M=iA, and since the charge is static, i=0. so, as per my thinking, ans. should be 0...
  45. S

    Electrostatics: Creating Charged Objects

    An iron arrowhead has an initial charge of 2.100e-6 C. How many electrons are required to give it a charge of −2.82 μC? I know that e (the elementary charge) = +/- 1.602E-19 C And N is the number (or excess charge) I tried solving this problem 2 ways. The first way: (2.100E-6 -...
  46. S

    Finding Electric Field Outside a Charged Conductor

    Homework Statement In case of having a conductor (spherically shaped and uncharged) and an irregularly shaped hole inside it with a charge at an arbitrary point, I am asked to find the electric field right outside the conductor sphere. Homework Equations Gauss's law ∫EdA=...
  47. M

    How Does a Charged Particle Behave in an Electromagnetic Field?

    If you go to the relativistic Hamiltonian, what allows us to go from \dot{\vec{P}} = - \frac{\partial \mathcal{H}}{\partial \vec{x}} = e (\vec{\nabla} \vec{A}) \cdot \dot{\vec{x}} - e \vec{\nabla} \phi to \frac{d}{d t}\left(\frac{m \dot{\vec{x}}} {\sqrt {1 -...
  48. C

    Do non-inertial frames perceive a B field?

    Lets say I am standing in the middle of a charged ring. And I am standing on a turn table. Now I start to rotate in the center. From my point of view do I perceive a B field. I mean I would have a velocity component.
  49. A

    Electric Field/ infinite charged sheet

    Homework Statement There are three charged sheets with various charge densities. The following link shows a diagram, and solutions (not mine; these are some professor's solutions but I don't understand them yet): http://www.phy.syr.edu/courses/PHY212.08spring/HW/WHW-3.pdf Draw vectors at...
  50. C

    Metal ball charged with electron orbiting

    Homework Statement An electron orbits a 3.0 cm diameter metal ball 5.0 mm above the surface. The orbital period of the electron is l2.0 micro seconds. What is the charge on the metal ball? r=1.5cm or .015m R=.02m (.015+.005) Orbit=12*10^-6s Homework Equations E=(kq/r)R which gives...
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