What is Moving charge: Definition and 93 Discussions

The Independent Moving Pictures Company (IMP) was a motion picture studio and production company founded in 1909 by Carl Laemmle. The company was based in New York City, with production facilities in Fort Lee, New Jersey. In 1912, IMP merged with several other production companies to form Universal Film Manufacturing Company, later re-named Universal Pictures Company with Laemmle as president.

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  1. J

    Magnetic field of a moving charge: which way to the North pole?

    http://cognizantwire.net/HTMLKHSL/ELECTRON/MAGNETIC/MAGNETIC.HTM http://www.chemistry.mcmaster.ca/esam/Chapter_3/section_3.html The first image shows the electron moving in a straight line, and in the second image it's moving in circles. In both images we see the north pole is up and south...
  2. P

    Question relating to direction of magnetic force on moving charge

    Hi I have always been very curious if anybody knows why the magnetic force on a moving charged particle in a magnetic field is always perpendicular to the plane containing the magnetic field's vector and the charged particles velocity vector. Any help would be greatly appreciated. Thanks...
  3. G

    Relativistic Magnetic Field of a moving charge

    I believe this delves into relativistic physics so I put this here. If I am incorrect I apologize. I've been learning about magnetic fields and how they are generated by moving charges. If a charge is moving at some arbitrary speed it generates a magnetic field. This is what I've been taught...
  4. Y

    Field generated by a moving charge

    I was reading Feynman's Lecture on Physics, chapter 28, where he mentioned the formula for the electric field generated by a moving charge. One thing I don't understand is that, if the charge moves at the speed of light towards the point of interest, then it moves at the same speed of the...
  5. S

    Retarded Potential of Moving Charge

    Homework Statement Calculate \phi_{ret} for a charge moving with constant v, along the x-axis. 2. The attempt at a solution $$ \phi = q \int_{-\infty}^{\infty} \frac{\delta(x' - vt')}{|\vec{r} - \vec{r}'|} dx'. $$ I then use the Dirac delta relation, $$ \int_{-\infty}^{\infty}...
  6. Q

    Why does an a moving charge spin in a magnetic field

    I am very much familiar with the Lorentz force. From what I know, that is HOW a moving charge in a magnetic field gains centripetal acceleration. My question is this : Is there any explanation over why a moving charge in a magnetic field moves in a circular motion? I know the magnetic field is...
  7. R

    Uniqueness Theorem, Concentric Equipotential Cylinders & Moving Charge

    Homework Statement Consider two electrodes 2 mm apart in vacuum connected by a short wire. An alpha particle of charge 2e is emitted by the left plate and travels directly towards the right plate with constant speed 106 m/s and stops in this plate. Make a quantitative graph of the current in...
  8. V

    Radiation from a moving charge

    1. The problem statement The problem is from the textbook Mathematics for Physicist by S.M. Lea. it's problem 2.35 The power radiated per unit solid angle by a charge undergoing simple harmonic motion is \frac{dP}{dΩ} = K \sin^{2}θ \frac{cos^{2}(ωt)}{(1+β \cosθ \sin(ωt))^{5}} where...
  9. C

    Work and electric potential in a moving charge

    1. Explain briefly the relationship between electric potential and work in moving a positive charge q from point A to point B in an electric field Should I explain that work is potential energy plus kinetic energy? is it asking for that? and also, does the fact that it's a positive charge...
  10. P

    Does a magnetic field created by a moving charge act upon the charge itself?

    Let's say that a positive charge is held in position. A negative charge, which is 25cm away, is then attracted to this positive charge. But as the negative charge is moving towards the positive charge, it creates a magnetic field. Would this magnetic field then push the negative charge...
  11. S

    Moving charge in gravitational field.

    An accelerated charge particle radiates. So, in the light of principle of equivalence, does a charge particle also radiate when it is in a gravitational field? Sorry if the question doesn't make any sense.
  12. A

    Understanding the Effects of Electric and Magnetic Fields on Moving Charges

    Dear Fellows I have just came across with the basics of electromagnetism, and about the application of electric and magnetic force on charge particle, Ohm's law for charge is j=σE (1) if the charge is moving with the...
  13. J

    Direction of magnetic field - moving charge

    Homework Statement according to Maxwell a moving charge will create a magnetic field perpendicular to the direction of travel. does this mean in ALL perpendicular planes (e.g: if the charge is moving to the left the magnetic field will act up, down, and side to side) or will it only act in one...
  14. A

    Electromagnetic Four-Vector for Uniformly Moving Charge

    The general formula for the electromagnetic four-vector produced by a moving charge is the Lienard Wiechert formula, which involves the retarded position of the charge. However, in the special case where the motion of the charge is a uniform velocity motion, the result becomes extremely simple...
  15. S

    How can a single moving charge generate a magnetic field relativistically

    Hey, I just remember reading about how the magnetic force can be thought of as a relativistic effect in the sense that the moving charge will see the charges in the wire contract and so it will see a higher density of positive (or negative) charges along the wire. However if this is true how...
  16. Y

    What is constant velocity? This is in a question of moving charge.

    This is in a question of finding retarded potential where the point charge is moving at constant velocity. The book let the charge pass through the origin at t=0 so \vec w(t) = \vec v(t) which I don't understand. This might be a stupid question. velocity is a vector with amplitude and...
  17. M

    Moving charge creates a magnetic field

    Hey. I am learning about electromagnetism and have been told that a moving charge creates a magnetic field which can then interact with an external magnetic and produces a force on the moving charge which is the basis of the motor effect etc. I am now onto electromagnetic induction and am...
  18. S

    Theoretical problem (no calculations) with electric field from moving charge

    Homework Statement I'm in a physics 2 (electricity and magnetism) course, and I'm having trouble with something the professor discussed in class. I tried approaching him about it afterwards, but it still didn't make sense to me. I really think he made a mistake here, and I'd like input...
  19. C

    Electric Field of Moving Charge

    The electric field of a charge moving with uniform velocity points towards the charge's present location. You can either get that from a whole lotta math on the vector and scalar potentials. Or more easily from special relativity. Is there a quick, minimally mathematical, and intuitive...
  20. A

    Two Parallel Conducting Plates with moving charge

    Homework Statement Two parallel conducting plates that are in deep space are brought to a potential difference of 3500 V, and a small pellet of mass 6.95 mg carrying a charge of 6.70 × 10-7 C accelerates from rest from the positive plate. With what speed will it reach the other plate...
  21. F

    Force on a moving charge in a magnetic field

    Can someone Explain to me the "force on a moving charge in a magnetic field". I have this assignment and i need to report it on friday and I am confused if that is the same with magnetic force on a moving charge. and can someone pls give me an example problem with answer if you can...
  22. H

    Moving charge in a magnetic field, magnetic-magnetic interaction?

    When a charged particle moves through a magnetic field, the field excerts a force in the normal-direction (90 degrees).. Is this caused by magnetic-magnetic interaction? I.e. a charged moving particle sets ut a circular magnetic field, is it this field which interacts with the magnetic...
  23. S

    Magnetic force on a moving charge particle with friction force acting on it

    Homework Statement A "q" charge particle is moving along +y axis with velocity V0 starting from Origin. A friction force is acting on the charge particle " f= -(alpha)V(Vector) ".A constant magnetic field of magnitude B0 acting along +Z axis. The mass of the particle is m. Find the x...
  24. P

    What is the speed of the moving charge when it's 1.0cm from the fixed charge?

    Homework Statement Two identical 25g particles each carry 5.0uC of charge. One is held fixed, and the other is placed 1.0mm away and released Find the speed of the moving charge when it's 1.0cm from the fixed charge Homework Equations The Attempt at a Solution I thought that...
  25. Jonnyb42

    Do moving masses create another field, similar to how a moving charge

    Do moving masses create another field, similar to how a moving charge creates a magnetic field?
  26. W

    Is magnetic field is produced by uniformly moving charge?

    Is magnetic field is produced by uniformly moving charge?is it affect it,s magnetic field? Is Magnetic field of charge is due to relative motion?
  27. Y

    Change in Kinetic Energy of a moving charge

    Homework Statement A charge of +5.5 micro-Coulombs lies at x = -3.6 cm, y = 0 cm, a charge of +5.5 micro-Coulombs lies at x = +3.6 cm, y = 0 cm, a charge of +5.5 micro-Coulombs lies at x = 0 cm, y = +3.6 cm, and a charge of -5.5 micro-Coulombs lies at x = 0 cm, y = -3.6 cm. A charge of -6.5...
  28. W

    Type and intensities of field of a moving charge

    When a charge is in motion then what kind of field/fields sorround it on which factor it,s strength depend?
  29. K

    Magnetic field around a moving charge

    why does a moving charge create a magnetic field around it? can you please explain the clear mechanism? thanks in advance
  30. W

    Electric field of moving charge

    When a charge start motion it produce magnetic field.Is this cause any change in electric filed of this charge?and when there is no acceleration in this charge it will have magnetic field?also is this is relative velocity?
  31. J

    Electrostatics: Moving Charge (comprehension problem)

    I already know what the answer to this problem should be, however I do not understand why that is the case. Homework Statement The negative charge (= -1 micro Coulombs) in the figure below goes from y = -5 to y = 5 and is made to follow the dashed line in the vicinity of two equal positive...
  32. R

    Magnetic Field and Moving Charge

    Homework Statement The drawing shows a charged particle (q=2.80x10^-6C) moving along the +y axis with a speed of 4.80X10^6 m/s. A magnetic field of magnitude 3.35x10^-5 T is directed along the +z axis, and an electric field magnitude 123 N/C points along the -x axis. Determine the (a)...
  33. A

    Doubt regarding Force exerted by a magnetic field on a moving charge

    a charged particle ( say 'q' ) moving with velocity 'V' in a region containing a magnetic field 'B' experiences a force 'F' given by: F = q(VxB) when V = 0, then force = 0 my doubt is, is this velocity relative to the magnetic field ? ( i.e. when the velocity relative to the...
  34. snoopies622

    Calculating the EM Field around a Moving Charge

    I want to know how to find the electromagnetic field at a given point around a moving charge and this has led me to a few questions. My first one is, do both the \mu _0 \bf {J} term and the \mu_0 \epsilon _0 \frac {\partial}{\partial t} \bf E term contribute to the...
  35. Z

    Magnetic Fields. Finding the angle of a moving charge.

    Homework Statement An electron is moving through a magnetic field whose magnitude is 8.70 X 10-4 T. The electron experiances only a magnetic force and has an acceleration of magnitude 3.50 X 1014 m/s2. At a certain instant, it has a speed of 6.80 X 106 m/s. Determine the angle \theta (less...
  36. P

    Is there a force exerted on both particles in the moving charge paradox?

    Hi there, here I have this paradox and hope you can explain. There are 2 charged particles, one is moving at speed v, one is stationary. We know the moving charge gives off a magnetic field which can not exert any force onto the other charge because it does not move. Now assume we stay in a...
  37. G

    Magnetic Force on a Moving Charge

    Homework Statement A magnet produces a 0.5 T field between its poles, directed to the east. A dust particle with charge q = -8 times 10-18 C is moving straight down at 0.6 cm/s in this field. What is the magnitude and direction of the magnetic force on the dust particle? Homework...
  38. J

    Relative Moving Charge: Electric vs Magnetic Field

    So what is the answer to "if I am moving at velocity v with respect to a single charge, charge q, will I see the electric field as I would at rest with respect to the charge, or will I see a magnetic field? what will be the strength of the magnetic field?"
  39. L

    Magnetism results from relativistic effects on a moving charge?

    Hi Does anyone have a link to a proof that magnetism is a result of relativistic effects on a moving charge? I am sure that I have seen one but I can't find it. Thanks John
  40. K

    A single moving charge constituite a current

    Can you tell whether a single moving charge constituite a current?Not necessarily steady current.I will be happy I we get a non-steady current.To have a non-zero current we need dq/dt not equal to zero.So at point in space,we measure dq/dt and it is 0 at time t,q at time t' and 0 again at time...
  41. A

    Magnetic field of a moving charge

    The magnetic field of a moving charge is: \boldsymbol{B} = \frac{\mu_0}{4\pi} \frac{q \boldsymbol{v}\times \boldsymbol{\hat{r}}}{r^2} This is an inverse square law. But also we know that every localized current distribution (and a moving particle is most obviously a localized current...
  42. B

    Magnetic force on moving charge

    greetings 1) 2) 3) 4) 5) cheers
  43. S

    Velocity & Force on a Moving Charge in Magnetic Field

    Are there components of the velocity that cannot be determined by measuring the force if one looks at the formula F = q*B*v?
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