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Rev. Cheeseman
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How does an electric field of a moving charge, for example a moving electron, inside a wire looks like? Does it looks like this with distorted circular radial lines?
Dale said:I would again recommend that you get some computer algebra software and program this yourself. Then you would know it is right.
That said, this is not the field of an electron in a wire. It is the field of a classical charge undergoing a brief acceleration in free space.
We can help with that too. And then at the end you will have actually learned EM and programmingwonderingchicken said:I don't know how to programmed it myself
There isn’t “really” a separate magnetic and electric field. They are different components of the electromagnetic field. The “real” thing is the combined electromagnetic field.wonderingchicken said:What is the real difference between the electric field and the magnetic field of a, say, radio wave?
Inside a wire it doesn’t make too much sense to think about the field of an individual charge. They behave collectively. Their collective field simply points along the wire proportional to the current density.wonderingchicken said:I tried to find pictures online on how an electric field of a moving charge inside a wire looks like
Dale said:Their collective field simply points along the wire proportional to the current density.
Dale said:No, that is exactly what I said doesn’t make too much sense.
That figure is for people who already understand electromagnetism and are trying to use it to learn relativity. I don’t think it will help you.
In what situation?wonderingchicken said:Can you think of any links that show the closest representations of what electric fields of every charges, not just individually but instead as the whole, actually look like?
Dale said:In what situation?
How would you know which was your selected electron, there are so many other free electrons, going every which way, while drifting slowly along together as a current.wonderingchicken said:How does an electric field of a moving charge, for example a moving electron, inside a wire looks like?
Can you think of any links that show the closest representations of what electric fields of every charges, not just individually but instead as the whole, actually look like?Baluncore said:How would you know which was your selected electron, there are so many other free electrons, going every which way, while drifting slowly along together as a current.
The electric field of the electrons on the wire can only be seen relative to the return circuit wire, which is at a different voltage and so establishes an electric field between the two wires. You need to know the geometry of the wires.wonderingchicken said:Can you think of any links that show the closest representations of what electric fields of every charges, not just individually but instead as the whole, actually look like?
Baluncore said:The electric field of the electrons on the wire can only be seen relative to the return circuit wire, which is at a different voltage and so establishes an electric field between the two wires. You need to know the geometry of the wires.
The equal and opposite current in the two wires, will sum to generate a magnetic field.
Top right;
https://en.wikipedia.org/wiki/Electric_dipole_moment#/media/File:VFPt_dipoles_electric.svg
Baluncore said:
The electric field is radial, falling towards zero volts at an infinite distance, but that is impossible with a current carrying circuit because there must be a return conductor for current to flow. Notice the magnetic field is orthogonal to the electric field.wonderingchicken said:... the electric fields coming out from this wire excluding the other wires ...
Baluncore said:The electric field is radial, falling towards zero volts at an infinite distance, but that is impossible with a current carrying circuit because there must be a return conductor for current to flow.
Baluncore said:Notice the magnetic field is orthogonal to the electric field.
Yes, but it is not useful, and it attenuates rapidly to make EM waves propagating as orthogonal E and M fields.wonderingchicken said:I saw some articles about cavity resonators generating parallel electric and magnetic fields few days ago so I think that's possible.
I guessed you've read the article, may I ask what is the title of the article? I forgot the title.Baluncore said:Yes, but it is not useful, and it attenuates rapidly to make EM waves propagating as orthogonal E and M fields.
The cross product of E and M is the Poynting vector, the direction of energy flow, which is orthogonal to E and M, so is into or out of the paper, parallel to the current.
I don't think Purcell will help you at all, because the wire is treated not correctly there. The correct treatment is here:Dale said:No, that is exactly what I said doesn’t make too much sense.
That figure is for people who already understand electromagnetism and are trying to use it to learn relativity. I don’t think “Purcell Simplified” will help you.
What article? What media? What about?wonderingchicken said:I guessed you've read the article, may I ask what is the title of the article?
The article in which you said "Yes, but it is not useful, and it attenuates rapidly to make EM waves propagating as orthogonal E and M fields."Baluncore said:What article? What media? What about?
I do not recall such an article.wonderingchicken said:The article in which you said "Yes, but it is not useful, and it attenuates rapidly to make EM waves propagating as orthogonal E and M fields."
So, how do you arrive at the conclusion?Baluncore said:I do not recall such an article.
Which conclusion exactly?wonderingchicken said:So, how do you arrive at the conclusion?
Baluncore said:Which conclusion exactly?
Baluncore said:I have been working in the world of EM and instrumentation for more than 40 years. I guess I might have picked a few things up along the way.
Yes, I have a very good reference for that. But first, why are you looking for these diagrams? Do you just want pretty pictures to decorate your wall, or are you hoping to accomplish something?wonderingchicken said:For example, in current-carrying wires.
Dale said:But first, why are you looking for these diagrams? Do you just want pretty pictures to decorate your wall, or are you hoping to accomplish something?
Baluncore said:Which conclusion exactly?
I have been working in the world of EM and instrumentation for more than 40 years. I guess I might have picked a few things up along the way.
Then it doesn’t really matter. Search the internet for the pictures you like the best. We are here for educational purposes, not decorating purposes.wonderingchicken said:As decorations to show the varieties of forms of electric/magnetic fields.
An electric field is a region in space where an electrically charged particle experiences a force. It is a vector quantity, meaning it has both magnitude and direction.
The electric field of a moving charge is different because it includes the effects of both the electric field created by the charge itself and the magnetic field created by its motion. This phenomenon is known as electromagnetic radiation.
The electric field of a moving charge can be calculated using the formula E = (1/4πε0) * (q/r2) * (1 - β2sin2θ)-3/2, where q is the charge of the particle, r is the distance from the particle, β is the velocity of the particle as a fraction of the speed of light, and θ is the angle between the direction of motion and the direction of the electric field.
The electric field of a moving charge can exert a force on other charged particles, causing them to accelerate or change direction. This is the basis for many technologies, such as electric motors and generators.
Studying the electric field of a moving charge has many practical applications, including understanding the behavior of particles in accelerators and designing electronic devices such as televisions and computers. It also has implications in the fields of telecommunications, astronomy, and medical imaging.