Electrostatics - Charge Density


by Herbststurm
Tags: charge, density, electrostatics
Herbststurm
Herbststurm is offline
#1
Nov5-08, 02:14 PM
Herbststurm's Avatar
P: 24
Hi,

if we only have an electrostatic potential given. How to calculate the charge density?

I know of course Maxwell equation, here without any time dependence, but I missed always some further specifications, or I forget something important

thanks
greetings
Phys.Org News Partner Physics news on Phys.org
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Mapping the road to quantum gravity
Chameleon crystals could enable active camouflage (w/ video)
Ben Niehoff
Ben Niehoff is offline
#2
Nov5-08, 02:59 PM
Sci Advisor
P: 1,563
Use Laplace's equation (derived from Gauss's Law):

[tex]-\nabla^2 \Phi = \rho / \epsilon_0[/tex]
clem
clem is offline
#3
Nov5-08, 03:54 PM
Sci Advisor
P: 1,250
That's Poisson, not Laplace.

Herbststurm
Herbststurm is offline
#4
Nov6-08, 11:38 AM
Herbststurm's Avatar
P: 24

Electrostatics - Charge Density


Thanks, that helps a lot.

I knew Poissons equation, but I forgot it. Damn...

Greetings


Register to reply

Related Discussions
Question-Electrostatics-Point charge and uncharged plate Introductory Physics Homework 1
Electrostatics and electric charge and field Introductory Physics Homework 1
electrostatics charge question Introductory Physics Homework 8
induced charge density by non-uniform dipole density in dielectric?! Classical Physics 1
Another charge density Introductory Physics Homework 3