- #1
mysubs
- 4
- 0
Hello everybody
I've been searching this today but I am a bit lost now. I've encountered two forms of Gauss law in its differential form, Poisson equation :
del2V(r) = -p(r)/e
del2V(r) = -4*pi*p(r)/e
where V:e.potential, p:charge density, e:permivity
Now, what's the difference between these two /or/ where does the (4pi) in the second one comes from?
Mathematically they are not equivalent, but they are presented as such. Any opinions?
I've been searching this today but I am a bit lost now. I've encountered two forms of Gauss law in its differential form, Poisson equation :
del2V(r) = -p(r)/e
del2V(r) = -4*pi*p(r)/e
where V:e.potential, p:charge density, e:permivity
Now, what's the difference between these two /or/ where does the (4pi) in the second one comes from?
Mathematically they are not equivalent, but they are presented as such. Any opinions?