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Dear Physics Forums members,

I have a research problem that involves electrostatics. My education is as a chemist, and thus I struggle to accurately represent my problem, so I thought that you guys could help me (and would be interested in the exercise).

Here is an image to summarize my problem.

So, in the starting point of my problem, I have my space divided into orthogonal cuboids. The cuboid at the center is particular: there is a charge distribution within it, ρ(

I explicitely represent three cuboids around the central cuboid in each direction, for a total of 7

What I would like to write is the equation for the polarization energy of this system (i. e. the energy change caused by replacing a conventional cuboid by a cuboid containing the charge distribution ρ(

The system is electrostatic, i e there is no variation of the magnetic field with time. It obeys the two equations:

∇E = ρ/ε

∇×E = 0

I know the dimension of the cuboid (the 3 lengths a, b and c from which the cuboid can be reconstructed).

I'm a bit lost and I don't know where to start.

Do some people have suggestions?

All the best!

I have a research problem that involves electrostatics. My education is as a chemist, and thus I struggle to accurately represent my problem, so I thought that you guys could help me (and would be interested in the exercise).

Here is an image to summarize my problem.

So, in the starting point of my problem, I have my space divided into orthogonal cuboids. The cuboid at the center is particular: there is a charge distribution within it, ρ(

**r**) and its dielectric constant is that of vacuum. All other orthogonal cuboids contain homogeneous, but not isotropic, continua. In the x direction, the dielectric constant is ε_{xx}, the component of the dielectric constant tensor**ε**, in y direction it is ε_{yy}, and in z direction it is ε_{zz}.I explicitely represent three cuboids around the central cuboid in each direction, for a total of 7

^{3}- 1 = 342 cuboids. This big cuboid is immersed into a continuum that corresponds to the average value of the dielectric constant tensor ε.What I would like to write is the equation for the polarization energy of this system (i. e. the energy change caused by replacing a conventional cuboid by a cuboid containing the charge distribution ρ(

**r**) and with the dielectric constant of vacuum).The system is electrostatic, i e there is no variation of the magnetic field with time. It obeys the two equations:

∇E = ρ/ε

_{0}∇×E = 0

I know the dimension of the cuboid (the 3 lengths a, b and c from which the cuboid can be reconstructed).

I'm a bit lost and I don't know where to start.

Do some people have suggestions?

All the best!

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