# Electrostatic Potential in Dielectric Medium

1. Oct 18, 2014

### fuchini

1. The problem statement, all variables and given/known data
I need to find the green function for a dielectric sphere ($\epsilon_1$) inside another dielectric medium ($\epsilon_2$) using the method of images.

2. Relevant equations
In gaussian units I have: $$\phi=\frac{q}{\epsilon|r-r1|}$$

3. The attempt at a solution
Due to the symmetry of the problem, the image charge would be located in the axis between the charge and the sphere's center. I don't know what would the boundary conditions be.

2. Oct 20, 2014

### stevendaryl

Staff Emeritus
Here's a web page that explains the boundary conditions across a dielectric:
http://www.ittc.ku.edu/~jstiles/220/handouts/Dielectric Boundary Conditions.pdf