Electromagnetic field theory. Q and A

[jj]

is there a limit to how much energy you can have on a photon?

Certainly, all of the mass-energy in the universe.

I'm not sure what happens if the E component exceeds the breakdown value of free space in one photon. Maybe somebody else knows.

 

[Anders]

is there a limit to how much energy you can have on a photon?

The energy of a photon is E=hv, where v is the frequence, and h Planck's constant. Also, c=lv where c is the speed of light and l the wavelength.

Those two equations together makes E=hc/l.

So the higher frequence the higher energy. But as you can see, l can't be zero so the energy of a photon can't ever be infinite.

 

[TillEulenspiegel]

is there a limit to how much energy you can have on a photon?

That depends on the viscosity of the energy, it's color and whether you use 1 or 2 coats.

 

[cogreslab]

Wow, Hans, I just got to this thread and it seems that you have quite a full class! But I think you should leave out or ban any discussion of brain waves if you wish to stay away from bioelectromagnetics.

 

[Johnny Pneumatic]

Wow, Hans, I just got to this thread and it seems that you have quite a full class! But I think you should leave out or ban any discussion of brain waves if you wish to stay away from bioelectromagnetics.

I'm a skeptic and was just wanting to learn someting I didn't know. Kumar is just trying to....do someting else. I've learned what I was wanting to know.

 

[yersinia29]

I've got some questions:

1) Whats the general equation for propagation of an electromagnetic wave in free space? I'm looking for a vector equation as a function of time and space. If its in differential equation form thats fine I dont need a closed set solution.

2) If a magnetic field is oriented in the +z direction, does a positively charged particle rotate CCW (right hand rule) or CW (left hand rule)?

3) What if its a negative charged particle, does the rule switch to left hand or what?

 

[Kumar]

A: I already answered no to this. Rephrasing the question won't get you another answer.

Previous A: Well, a magnetic field will align atoms in a magnetic material and make it temporarily magnetic. Strong electric fields can ionize materials and cause chemical change. Certain types of crystals will change shape if an electical field is applied to them (piezoelectricity).

Just to clear. You awnser indicate that strong magnetic fields can leave permanent effects on materials by causing chemical change or shape change. It is not transit type or temporary effect. Is it ok?

Q: Does it also meams that these fields can't exist independantly? How then these are measured?

A: No, they do not exist independently. They are measured with suitable instruments.

Does every substance have its own specific MFs? Can we know its type/characteristics & recreate this specific type MFs?

 

[epepke]

I had edited my post but I guess the forum didn't get it. Are brain waves electromagnetic radiation? If not what are they? If yes where are they on the EM spectrum? In radio?

Brain waves (if you're thinking on the order of Alpha and Theta waves) are usually measured as differences in potential at points on the skull. They are way low on the EM spectrum, around 7-12 Hz. Radio is typically 100,000 Hz. or above, although ultra-low frequencies around 10,000 Hz are used to communicate with submarines. Doubtless there is some electromagnetic radiation, but very little, due to the impedance mismatch with the skull. A reasonable momopole antenna for this would be about the radius of the Earth in length. Most heads are smaller than this, though you might not notice it by reading this forum.

 

[Walter Wayne]

SkepticJ:

Q: Are the magnetic fields around electromagnets and normal magnets composed of photons? If not what are they?

A: No, they are composed of something we have chosen to call magnet lines. We do not know what that is (any more than we know what a photon is ).

Hans, I beleive the magnetic field is also carried by photons in these cases. I'm wondering where you heard that the phenomenon has an unknown 'force carrier'.

Walt

 

[epepke]

Hans, I beleive the magnetic field is also carried by photons in these cases. I'm wondering where you heard that the phenomenon has an unknown 'force carrier'.

The electrostatic attraction and repulsion is carried by photons. The "magnetic field" is just a pattern of how this happens under relativity. The magnetic lines of force are just a visualization and teaching tool.

 

[Walter Wayne]

3) What if its a negative charged particle, does the rule switch to left hand or what?

A negatively charged body will physically spin in the opposite direction, but since magnetic spin is determined by the rotation of charge they will have a similar spin

A positive charge spinning CW has a CW magnetic spin, and a negative charge spinning CCW has a CW magnetic spin as well.

Walt

Edit: in answer to your second question RHW and CCW.

 

[MRC_Hans]

Wow, Hans, I just got to this thread and it seems that you have quite a full class! But I think you should leave out or ban any discussion of brain waves if you wish to stay away from bioelectromagnetics.

Yes, and I'm waiting for your questions.

Brainwaves are bordering on bioelectromagnetics, but as long as we stick to technical facts, I see no problem.

Hans

 

[Walter Wayne]

I've got some questions:

1) Whats the general equation for propagation of an electromagnetic wave in free space? I'm looking for a vector equation as a function of time and space. If its in differential equation form thats fine I dont need a closed set solution.

And to your first, if we assume a plane wave in free space travelling in the z-direction it is:

Ex = E₀cos(2 π f t-2 π f/cz)
Ey = 0
Ez = 0

Hx = 0
Hy = E₀/η * cos(2 π f t-2 π f/cz)
Hz = 0

η is free space impedance and is about 377 ohms.

If you don't specify a plane wave, the solution can become quite interesting.

 

[MRC_Hans]

yersinia29:

Q: Whats the general equation for propagation of an electromagnetic wave in free space? I'm looking for a vector equation as a function of time and space. If its in differential equation form thats fine I dont need a closed set solution.

A: Ops, I'll have to look that one up, hang on.


Q:
2) If a magnetic field is oriented in the +z direction, does a positively charged particle rotate CCW (right hand rule) or CW (left hand rule)?

3) What if its a negative charged particle, does the rule switch to left hand or what?

A: Walter answered those. Thanks Walter, with this level of traffic, I'm gonna need all the help I can get.

Edited to add: I see Walter took care of #1 while I was typing, thanks again !

Hans

 

[MRC_Hans]

Kumar:
Q: Just to clear. You awnser indicate that strong magnetic fields can leave permanent effects on materials by causing chemical change or shape change. It is not transit type or temporary effect. Is it ok?

A: No, that was strong electric fields. Do try to actually READ the answers.

Q: Does every substance have its own specific MFs? Can we know its type/characteristics & recreate this specific type MFs?

A: Please use only generally accepted abbreviations. Do you mean magnet fields? No, every substance does not have its specific magnet field. It cannot be identified or recreated using a specific magnet field. Each substance has its characteristic spectral response, but that is another matter.

Hans

 

[Kumar]

Originally posted by MRC_Hans

A: No, that was strong electric fields. Do try to actually READ the answers.
Previous A: Strong electric fields can ionize materials and cause chemical change. Certain types of crystals will change shape if an electical field is applied to them (piezoelectricity).

Sorry,You didn't follow my Q. I meant to ask whether this effect is permanent or temprary/In-transit?

A:...Each substance has its characteristic spectral response, but that is another matter.

Can you bit explain it?

Walter Wayne quote:
--------------------------------------------------------------------------------
Hans, I beleive the magnetic field is also carried by photons in these cases. I'm wondering where you heard that the phenomenon has an unknown 'force carrier'.

Mr.Hans, can you please clarify it? Can magnetic field is also carried by photons?

Q: ... Are radiation also of non-physical nature?

A: They are not non-physical, they are a physical property. Like the weight of an object.

Then, I think that these radiation can live independantly (as Sun-light?). Can then these radiation particles seprated from the origional substance, transfered & stored on/in other substance?

 

[MRC_Hans]

Kumar:

Q: Mr.Hans, can you please clarify it? Can magnetic field is also carried by photons?

Then, I think that these radiation can live independantly (as Sun-light?).

A: No, that is exactly the point. First, you must realize that a photon is not some sort of object. It is a quantum unit.

Then to the difference to (sun)light (I have been waiting for the question that would lead to this. Funny it should be Kumar who asked it ):

A field (magnetic or electric) is a force, it does nothing in itself, it is just a single-dimension force vector. If you combine two forces, an electromagnetic field and an electric field, you have a power. A power can be said to be two-dimensional. It has the potential for transferring energy, but it does not. Now add a third vector, time. Now you have energy(and three dimensions). Finally, add the fourth dimention, space; now the energy is transmitted, you have a wave phenomenon. Light is a wave phenomenon, and it can exist independently of its source, because the waveform is emitted and travels through space on its own. Not so with the field.

Q: Can then these radiation particles seprated from the origional substance, transfered & stored on/in other substance?

A: No Kumar, there is no way you can weasel an explanation for homeopathy out of this. Been there, done that, bought the T-shirt .

(I have started to color the answers blue for easier reading)

Hans

 

[Benguin]

I hate to interrupt the conversation you are having with Kumar, but I do have a question.

In terms of pure electric fields is there a minimum potential difference (or tension) required for the field to exist? or is it just incredibly small and weak for low values?

I got thinking about it after scott/luvhumility's funny little anti-tartness device. I know that was nonsense, but I did wonder what kind of field one would get from the anode connected to a few a 9V cells, and whether it would be at all measurable further than picometres away from the tip.

 

[Kumar]

A: No Kumar, there is no way you can weasel an explanation for homeopathy out of this. Been there, done that, bought the T-shirt

Mr.Hans,

I may not need for myself an explanaition for homeopathy because I have with me CPE/Placebo/other than...cancepts. But I do try for others, you...etc. or for some differant knowledge.

Thanks for your other replies but it is bit technical for me. Still, it will be interesting for me to know 'photon' concept & orbit shift concept.

Actually, one Peter chapell(you may be knowing him from otherhealth BB for his AIDS PC1 remedy) has claimed somewhat that' taken some imprint & made some remedy from it).

Q: What is the PC1 remedy made from?
A: It is made from the totality of the AIDS picture (physically, psychologically and spiritually), imprinted magnetically into water. The way water holds memory is beginning to be understood scientifically, and ‘Ie crystals’ is one explanation of this phenomenon.

http://www.aids-heal.com/faq.htm

They are made from a healing thought form, based on the totality of the disease imprinted into water and then transferred into a dropper bottle or into dry granules. There is no physical content, no physical source, they are not made from animal, plant or mineral sources, nor is it radionic or similar.
It’s a completely new method. This is unlike other medicines of homeopathy that are made from plant, mineral or biological sources. This is not an immune boosting herbal/mineral combination. It is a completely new invention, and nothing like it has been made before. http://www.peterchappell.net/remedies.htm
http://www.aids-heal.com/pc1hist.htm

 

[MRC_Hans]

Benguin:
I hate to interrupt the conversation you are having with Kumar, but I do have a question.

You are very much welcome! As long as Kumar asks questions that can lead to sensible answers, I'll go on answering him.

Q: In terms of pure electric fields is there a minimum potential difference (or tension) required for the field to exist? or is it just incredibly small and weak for low values?

A: Yes. An electric field is caused by a charge, and the minimum charge you can have is one quantum = one electron.

I got thinking about it after scott/luvhumility's funny little anti-tartness device. I know that was nonsense, but I did wonder what kind of field one would get from the anode connected to a few a 9V cells, and whether it would be at all measurable further than picometres away from the tip.

An electric field is measured between two conductors with different charge, so no matter how far you put the wires apart you would have a 3V (Ithink it was 3V) between them, and the corresponding field. Whether it would be measurable is another story. Since the impedance is extremely high, it would certainly require very sophisticated equipment to detect it. The pole shift, when his relay trips, OTOH, should be detectable under laboratory conditions.

Hans