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-   -   Please help with this derivation on part of the retarded potential (http://physicshelpforum.com/advanced-electricity-magnetism/5773-please-help-derivation-part-retarded-potential.html)

yungman Apr 24th 2011 03:13 PM

Please help with this derivation on part of the retarded potential
 
I cannot do it with Latex, so I have to up load with image!! I have to actually go to physics forum, type in the Latex there and then copy on to Woed, then scan and then upload onto Tinypic to put it on here. If you have any better idea to do Latex direct here, that would save a lot of time.

http://i51.tinypic.com/5l2p6o.jpg

Please help me on this,

Thanks

Alan

topsquark Apr 24th 2011 06:05 PM

Quote:

Originally Posted by yungman (Post 17083)
I cannot do it with Latex...

I'll look at the rest of the problem (no promises) but I can quickly address the LaTeX problem. There is a sticky about this in the LaTeX Help forum, but briefly we can use the "command line"

[img]http://latex.codecogs.com/png.latex?*LaTeX commands go here*[/img]

-Dan

yungman Apr 24th 2011 06:28 PM

Quote:

Originally Posted by topsquark (Post 17086)
I'll look at the rest of the problem (no promises) but I can quickly address the LaTeX problem. There is a sticky about this in the LaTeX Help forum, but briefly we can use the "command line"

[img]http://latex.codecogs.com/png.latex?*LaTeX commands go here*[/img]

-Dan

I read your other post and I'll look into the Latex stuff. How about the current question? I am getting quite despirate!!! Sorry!!

Thanks

topsquark Apr 24th 2011 06:42 PM

Okay, first an admission. I am somewhat familiar with advanced and retarded Green's functions, not advanced and retarded potentials. That they are related is clear, but I don't know just how to relate one to the other.

I noticed an interesting mistake in the equation below (1). You are correct that there are similarities with (1), but you have missed the details of the primes. Here is what the equation should be:

http://latex.codecogs.com/png.latex?...artial z'}

http://latex.codecogs.com/png.latex?... \eta \right )

That, at least, puts that term in the form you need it.

-Dan

yungman Apr 24th 2011 10:33 PM

Thanks, actually that's the second part of my question, http://latex.codecogs.com/png.latex?...r\;',t_r)} is at the source point (x',y',z') so It is should be http://latex.codecogs.com/png.latex?...t z J_{z'} instead of http://latex.codecogs.com/png.latex?... +\hat z J_{z} in all the equation.

But as show in (A), there is the charge density term that I really don't get:


http://latex.codecogs.com/png.latex?...abla'\eta)

I guess I reverse engineering your latex and got it now!!! Now that I know how to post Latex, I am alive!!!


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