- #1

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## Main Question or Discussion Point

Hi guys.

I play now a bit with EM fields and I have encountered some problems connected with Dirac delta. By coincidence I visited this forum and I thought I could find some help in here.

The problem is that in order to get a potential in some point from a single charge you need to just solve such thing:

[tex]

\square \phi = - \frac{ \rho}{\epsilon}

[/tex]

and there by the way you need to use such equation:

[tex]

\nabla^2 \frac{ 1}{ | \vec{r} - \vec{r_0} |} = - 4 \pi \delta ( \vec{r} - \vec{r_0})

[/tex]

I would appreciate if someone could show me where it comes from :)

PS. Sorry for my mistakes or improper names for some mathematical or physical stuff but I am from Poland :P

I play now a bit with EM fields and I have encountered some problems connected with Dirac delta. By coincidence I visited this forum and I thought I could find some help in here.

The problem is that in order to get a potential in some point from a single charge you need to just solve such thing:

[tex]

\square \phi = - \frac{ \rho}{\epsilon}

[/tex]

and there by the way you need to use such equation:

[tex]

\nabla^2 \frac{ 1}{ | \vec{r} - \vec{r_0} |} = - 4 \pi \delta ( \vec{r} - \vec{r_0})

[/tex]

I would appreciate if someone could show me where it comes from :)

PS. Sorry for my mistakes or improper names for some mathematical or physical stuff but I am from Poland :P