Electromagnetic Help: Finding Suitable Green Function

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montser
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electromagnetic help!

I have a general question on finding the suitable green function for a given potential for example:
Find the suitable green function for \nabla^2 \varphi= \frac{1}{l^2} \exp (\frac{-|x|}{l})
 

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I didn't get to see your Qus.pdf, but if the only BC is \phi-->0 as
r-->infinity, then G=-1/{4\pi|r-r'|}.
 
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