Moving charge Definition and 94 Threads

Looking at the fields that result from a uniformly moving electric charge, derived from the Lienard-Wiechert potentials, you find that an observer at a right angle to the direction of travel will see a magnetic field proportional to ##\beta (1 - \beta^2)## suggesting a maximum field at ##\beta =...

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...

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...

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...

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...

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}...

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...

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...

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...

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...

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...

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.

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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

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?

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...

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

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

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?

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...

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)...

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...

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...

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...

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...

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...

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?"

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

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...

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...

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