I got the point and also I found a paper on this topic in American Journal of Physics-1995. One thing I want to know, What the basic difference between the field with radiation and without radiation is.
Recently I found that, if I apply a sinusoidal current to a long solenoid I get a radiation from it. It is completely theoretical result. I want to verify whether my result is correct or not. For this verification I need either some experimental result or some theoretical explanation whether it...
Maxwell equation is curl B=J+\partialE/\partialt (ignoring some factors)
and also curl E=-\partialB/\partialt
as J is time dependent, therefore magnetic field should depends on frequence.
with ac magnetic field in a solenoid is= n*i sin(wt)-n*i sin(wt)*(R^2 -r^2)*w^2/(4*c^2) ,(with first approximation),in fact the magnetic field in side the solenoid is not uniform ,it has some r-variation.
to all,
I think one can replace time by entropy. A lot of problems are there but still one could think about it(as I think).I don't know whether it is more difficult or easy for calculation, but it has a great physical meaning.
This is one of the possibilities.In some sense it is equivalent to...
is there any need to introduce time as a parameter?
is there any meaning of time, without any velocity?
time is because of some change and that change can be measure by position only. so why is there an unnecessary extra parameter (time).is there any need to measure a rate of change with...
oh..but, thank you very much.
can i neglect the j*A term (for simplicity)? because it is much weaker than electric field.
actually i want to calculate it without looking any book.
please help
thanks Bob,
is there any explanation behind this T.i mean, we have to calculate this T.what i am trying to say is that ,this fluctuation may be related to this T.
if there is such fluctuation,then it can be treat as the external perturbation (time dependent) in that atom,and
therefore we are...
recently i listened something about vacuum fluctuation.i don't know what exactly is it.but from that fluctuation is it possible to say that there is some width of the energy eigenvalue of a system where the particles are interact with em field.i don't know anything about field theory.
to,
neopolitan
is it a meaningful question that "if the speed of light in that medium is less than 'c'. then the observer who standing outside the medium will realize that the rest mass of photon (moving in the medium) is non-zero."
I have a problem about the speed of light in refractive medium. if the speed of light in that medium is less than 'c'. then the observer who standing outside the medium will realize that the rest mass of photon (moving in the medium) is non-zero. because the speed of the photon is less than 'c'...